D.E. HOLBROOK, J.

On August 4, 1974, plaintiffs commenced suit in Muskegon County Circuit Court for purposes of quieting title to land along the North Branch of the Muskegon River, restraining defendants from removing timber and brush, and seeking damages for the timber removed. A bench trial was had September 24, 1974. On January 30, 1975, the trial court filed its opinion, finding that (1) plaintiffs had possessed the disputed land adversely for 15 years, (2) the state's tax deed was inadequate to support its claim to a portion of the disputed land in the absence of proof that statutory conditions for perfection of title were met, and, (3) a question of adverse possession as against the state did not arise since the claimants had perfected title by adverse possession prior to the state obtaining title. Judgment was accordingly entered July 7, 1975. Defendant now appeals, raising eight issues, two of which require reversal of the lower court's judgment.

Plaintiffs claim property adjacent to five cabins along the river which they and their predecessors have allegedly occupied for at least 15 years. The property surrounding one of the cabins claimed by Millard and Marian Caywood is located entirely in Government Lot 4, Section 12, Town 10 N, Range 16 W, as is a portion of the land surrounding a cabin claimed by Duane Cottrell. The remainder of the land surrounding the Cottrell cabin and that adjacent to the other three cabins is located in Government Lots 1 and 2, Section 11, Town 10 N, Range 16 W. The state relied upon a 1925 tax deed as establishing its title to Government Lot 4. Government Lots 1 and 2 were conveyed to the state by warranty deed dated March 9, 1964.

The tax deed of the state was executed pursuant to 1893 PA 206, § 127, repealed by 1941 PA 234. At the time of the execution of the deed, 1893 PA 206, § 127; 1915 CL 4126 provided:

"Lands delinquent for taxes for any five years, where said lands have been sold and bid off to the state for the taxes of one or more of the said years, and then so held, and no application having been made to pay, purchase or redeem the said lands for said taxes and no action pending to set aside such taxes or to remove the cloud occasioned thereby, shall, within the meaning of this act, be deemed abandoned lands, unless such lands are actually occupied by the person having the record title thereto. Any lands delinquent for taxes for a period of five or more years, and said lands having been sold and bid in by the state and held by the state for the taxes of any of said years, and no application having been made to pay, redeem or purchase the same, and no suit pending to set aside said taxes or remove the cloud from the title occasioned thereby, shall be subject to the provisions of this section. Whenever it shall appear by the records in the auditor general's office that any lands are delinquent for taxes for five years or more and that said lands have been bid off to the state one or more times by reason of such delinquent taxes, and that the time of redemption of such sale [or] sales has expired and that no application has been made to pay, to redeem or purchase the same, and it shall appear that no action is pending in the circuit court of the county where said lands are situated to set aside the taxes or remove the cloud on the title occasioned thereby, the title to the state shall be deemed absolute in and to said lands; and it shall be the duty of the auditor general and the commissioner of the state land office to cause an examination of such lands to be made as soon as practicable, to ascertain their value and if abandoned."

See, Grand Rapids Trust Co v Doctor, 222 Mich. 248; 192 N.W. 641 (1923). The redemption period then provided was the time between the sale and the first Tuesday of May of the following year. 1893 PA 206, § 74; 1915 CL 4072, presently MCLA 211.74; MSA 7.120. 1903 PA 84, § 1; 1915 CL 4161, presently MCLA 211.431; MSA 7.661, provided:

"After the expiration of 6 months from and after the time when any deed made to the state under the provisions of section 127 of Act 206 of the Public Acts of 1893, being the general tax law, and acts amendatory thereto, shall have been recorded in the office of the register of deeds for the county in which the land so deeded shall be situated, the title of the state in and to the same shall be deemed to be absolute and complete, and no suit or proceeding shall thereafter be instituted by any person claiming through the original or government title to set aside, vacate or annul the said deed or the title derived thereunder."

In the present case, the state's title to the land was absolute at the earliest in 1925 when the property was bid in by the state for the fifth time and no efforts had been made to redeem from the tax sales of 1921-1925, or, at the latest, June 1, 1926, six months after the deed issued to the state was recorded. Suit could not be brought thereafter by those claiming under the original title nor could the title of the state be collaterally attacked. Dean v Department of Natural Resources, 61 Mich. App. 669; 233 N.W.2d 135 (1975), lv granted, 395 Mich. 792 (1975). The trial court erred, therefore, in holding that the state's tax deed was inadequate to withstand plaintiffs' claims of adverse possession in the absence of proof of the invalidity of the underlying proceedings. Even in cases contesting the validity of tax deeds issued by the auditor general to private citizens, the deed is prima facie evidence of title and the burden of proving the invalidity of the deed is upon the party seeking to avoid it in a direct proceeding. Ritter v Corkins, 319 Mich. 484; 30 N.W.2d 41 (1947), Smelsey v Safety Investment Corp, 310 Mich. 686; 17 N.W.2d 868 (1945).

It is an often-stated rule that the statute of limitations for the recovery of real property does not run against the state, and, therefore, land held by the state cannot be acquired by adverse possession. Young v Thendara, Inc, 328 Mich. 42, 49; 43 N.W.2d 58 (1950), Staub v Tripp, 248 Mich. 45; 226 N.W. 667 (1929), rev'd on other grounds, on rehearing, 253 Mich. 633; 235 N.W. 844 (1931), Grand Rapids Trust Co, supra. However, the more correctly stated rule is that this is so in the absence of legislation to the contrary. Staub v Tripp, 248 Mich. 45, at 48; 226 N.W. 667 (1929). We expressly note that Young relied on Staub for its source for the above-mentioned rule. We find that in Michigan there is legislation abolishing the general rule and that land can be acquired against the state by virtue of adverse possession. MCLA 600.5821; MSA 27A.5821.

Although the statute has not been directly interpreted, and indeed appears to have been ignored by bench and bar, the plain meaning of the statute would allow title by adverse possession to be acquired as against the state. An early case, Chamberlain v Ahrens, 55 Mich. 111; 20 N.W. 814 (1884), recognized the injustice in allowing the state to sit on its rights while the possessor occupies, improves, and holds the land for the statutory period. The Court observed:

"Under the statutes in force when the land was bid in, the State had a title which might have been enforced before the controversy arose in 1867. It would be a perversion of all sound rules to hold that by waiting over twenty years and then selling an old tax bid, that period should not count in the possessor's favor. The State is bound by the statutes of limitations, and defendant's rights are as complete against this title as against the other." 55 Mich at 112-113.

Apparently this case allowed adverse possession claims against the state. This case has never been expressly overruled.

Certainly this is the just and reasonable result. However, Grand Rapids Trust Co, Staub and Young, supra, seem to dictate a contrary result. It is of great relevance that in none of these cases did the Court discuss or even mention the statutory limitation on actions by the state for recovery of land or mention Chamberlain.

Were we to stop here, our decision would indeed be a difficult one. We have expressed statutory language which appears to allow adverse possession claims against the state. On the other hand, we have Supreme Court precedent which apparently demands the contrary result. Our inclination would be to assume that the Court had not been called upon to decide the meaning of the statute and that we would be free to find the meaning of this legislation.

Our task has been made easier by Supreme Court comment in People v Clement, 356 Mich. 314; 96 N.W.2d 804 (1959). In that case, the people of the state acting through the Director of the Department of Conservation brought an action against defendant for damages to personal property. Defendant successfully invoked the protection of the statute of limitations for actions for injuries to person or property and actions for trespass. This statute had been expressly applied to the state by the Legislature. The Court's discussion is enlightening:

"The plain language of these 2 sections clearly bars this action, brought more than 3 years after the cause of action accrued. Plaintiff's contention seems to be, however, that we should hold that the statute does not mean what it says. As authority for that position and by way of analogy, plaintiff refers to CL 1948, § 609.11 (Stat Ann § 27.603) fixing a 15-year limitation on suits by the State for recovery of lands. Plaintiff cites Chamberlain v Ahrens, 55 Mich. 111, [20 N.W. 814 (1884)], as holding that the State is subject to this latter statute of limitations in actions concerning lands held in a proprietary capacity. While the lands there involved may have been held in such capacity, we observe that this Court took no note of that fact in holding the State bound by the statutes of limitations. Plaintiff goes on to say that that statutory 15-year limitation on actions by the State for recovery of lands does not apply to those held by the State in its sovereign capacity, citing State v Lake St Clair Fishing Shooting Club, 127 Mich. 580; [87 N.W. 117 (1901)]; Crane v Reeder, 21 Mich. 24 (4 Am Rep 430) [1870]; Grand Rapids Trust Co v Doctor, 222 Mich. 248; [192 N.W. 641 (1923)]; and Staub v Tripp, 248 Mich. 45 [ 226 N.W. 667 (1929)]. Plaintiff concludes, in effect, that this Court having construed, in those cases, the statutory 15-year limitation on actions for recovery of lands by the State to mean something less than it says, those cases are authority for doing as much with the cited provisions relating to the 3-year limitation on personal actions by the State, by holding that that limitation does not apply to actions for trespass on lands held in a sovereign but only to those held in a proprietary capacity.

"At the outset, it is clear that the statutory provisions fixing a 3-year limitation on personal actions brought by the State do not, by express terms, evidence a legislative intent to make the distinction contended for by plaintiff. Furthermore, in none of the above cases cited by plaintiff is the actual holding authority for it even in suits for the recovery of lands. In the Fishing Shooting Club Case the Court based its holding on the ground that the statutory period had not yet run out against the State. In Crane v Reeder decision turned on the holding that it was not the legislative intent that the statute of limitations should operate retrospectively against the State (p 77). In the Grand Rapids Trust Company Case and the Staub Case this Court made no more mention of a distinction to be made between lands held in a sovereign and those held in a proprietary capacity. In the latter case the Court denied application of the limitation as against the State, even though the land involved clearly was held in a proprietary capacity for the purpose of sale. In neither of the latter 2 cases was mention made of the above-cited statutory 15-year limitation on actions by the State for recovery of land. How its provisions were avoided therein does not appear from the reasoning in the opinions." (Emphasis supplied.) Clement, supra, 316-317.

We do recognize that these comments may not have been necessary for the decision in Clement. Nevertheless, the observations are appropriate, and we hold that they are controlling. The Legislature has specifically enacted a statute of limitations which requires the state to commence an action to recover such lands within 15 years after the right or title of the people of the state first accrued. This the state did not do. Whether the Courts were never called upon to interpret the statute or expressly chose to ignore it is irrelevant. We find the comments in Clement controlling and we hold title by adverse possession can be asserted against the state.

In order to secure title by adverse possession, the claimant's possession must be actual, visible, open, notorious, exclusive, continuous, uninterrupted for the statutory period and under cover of claim of right. Burns v Foster, 348 Mich. 8; 81 N.W.2d 386 (1957), Rose v Fuller, 21 Mich. App. 172; 175 N.W.2d 344 (1970), Whitehall Leather Co v Capek, 4 Mich. App. 52; 143 N.W.2d 779 (1966). Whether adverse possession is established depends upon the facts of each case and the character of the premises. Burns v Foster and Whitehall Leather Co v Capek, supra. Acts of ownership which openly and publicly indicate an assumed control or use consistent with the character of the premises are sufficient. Monroe v Rawlings, 331 Mich. 49; 49 N.W.2d 55 (1951), Rose v Fuller, supra. The doctrine of adverse possession is strictly construed. The party alleging title by adverse possession must prove the same by clear and positive proof. Burns v Foster and Rose v Fuller, supra. An adverse claimant is permitted to add his predecessors' periods of possession if he can establish privity of estate either by mention of the disputed lands in instruments of conveyance or orally at the time of transfer. Siegel v Renkiewicz Estate, 373 Mich. 421; 129 N.W.2d 876 (1964), Arduino v City of Detroit, 249 Mich. 382; 228 N.W. 694 (1930). Equity cases are reviewed de novo. The trial judge's findings of fact, however, will not be overturned or modified unless they are clearly erroneous or the reviewing court is convinced it would have reached a different result had it occupied the position of the trial court. Roberts v Duddles, 47 Mich. App. 601; 209 N.W.2d 720 (1973), Ogorek v Loisell, 33 Mich. App. 245; 189 N.W.2d 738 (1971). In the case at bar, the trial court's ultimate finding that the plaintiffs adversely held the claimed property by parol passage for the statutory period may be unsupported by the record. We direct the trial court to examine the trial record and adequately justify his conclusions. This is particularly necessary in a case such as this where adverse possession is claimed by the possession of successive claimants who transferred interests without adequate written legal descriptions.

Plaintiffs' evidence consisted largely of testimony by the claimants of their use and enjoyment of the disputed lands. There was also testimony of prior users and testimony of those people from the area who had long time personal knowledge of the area and its inhabitants. The testimony was entitled to be believed or disbelieved and its importance weighed by the trial judge. There were also two quitclaim deeds which were unrecorded and offered to show ownership of the land purportedly transferred. Also introduced were photographs of the area showing the use thereof of the disputed lands. We also note that even the warranty deed of March 9, 1964, by which the state took title to Lots 1 and 2 referred to certain adverse claims to the property which the court determined to be referring to those cabin sites in dispute. Therefore, we feel that the judgment of the court below as regards the claimants' possession as establishing that it was actual, visible, open, notorious, exclusive and continuous as required by Burns v Foster and Rose v Fuller, for the statutory period could be established from the record.

However, there is also evidence to the contrary. The quitclaim deed purported to transfer "cabins" and not descriptions of parcels of land. Plaintiffs' testimony often referred to their acquisition of "cabins". Furthermore, none of the lands were fenced in and apparently others used the cabins occasionally and they were not occupied part of the year. Therefore, the court below should have been more specific as to its findings of fact as to the adverse possession claim. In addition, the court below relied on Dubois v Karazin, 315 Mich. 598; 24 N.W.2d 414 (1946), as allowing plaintiffs to tack on their predecessors' periods of possession to meet the required statutory period. While it is true that this is an accurate statement of the law, it requires further elaboration. The rule was more fully stated by the Supreme Court in Siegel v Renkiewicz Estate, 373 Mich. 421, 425; 129 N.W.2d 876, 879 (1964):

"Likewise, it has long been the rule in Michigan that the statutory period of possession or user necessary for obtaining title by adverse possession or easement by prescription is not fulfilled by tacking successive periods of possession or user enjoyed by different persons in the absence of privity between those persons established by inclusion by reference to the claimed property in the instruments of conveyance or by parol references at time of conveyances.

Stewart v Hunt, 303 Mich. 161; [ 5 N.W.2d 737 (1942)]; von Meding v Strahl, 319 Mich. 598; [ 30 N.W.2d 363 (1948)]." (Emphasis supplied.)

We cannot be sure that the trial judge applied either a correct or incorrect analysis from the January 30, 1975, opinion. The facts as decided by the court could possibly establish the requisite privity. However, the facts may also be subject to a contrary finding. This question is for the trial court.

GCR 1963, 517.1 requires a trial court sitting without a jury to find the facts specifically and state separately its conclusion of law. Brief, definite, pertinent findings of fact are sufficient. In Ray v Mason County Drain Commissioner, 393 Mich. 294, 302; 224 N.W.2d 883 (1975), the Supreme Court quoting from 2 Honigman Hawkins, Michigan Court Rules Annotated (2d ed), p 594, enumerated the requirements of the court rule:

"`The findings of fact must include as much of the subsidiary facts as is necessary to disclose the steps by which the trial court reached its ultimate conclusion on each factual issue. The findings should be made at a level of specificity which will disclose to the reviewing court the choices made as between competing factual premises at the critical point that controls the ultimate conclusion of fact.'"

See also Powell v Collias, 59 Mich. App. 709; 229 N.W.2d 897 (1975). In the present case, the trial court found "the proof adduced at the hearing left no doubt in the mind of the court that all of the plaintiffs herein had owned the land in question and had possessed it adversely through parol passage of title for more than the statutory period of 15 years". The trial court's opinion is insufficient to comply with the court rule. Five separate claims were asserted. Questions were presented as to the use each of the plaintiffs made of the property, their ability to add successive periods of possession and their predecessors treatment of the land. The trial court made insufficient findings to support its ultimate conclusion that the property was adversely held for the requisite period. The procedure in a case to which the lower court has failed to comply with GCR 1963, 517.1 is to remand for the preparation and certification of findings of fact. Ray v Mason County Drain Commissioner, supra.

Therefore, we find that the 1925 tax deed established the state's title to the land which became absolute six months after the deed was registered. The state held title by tax deed to Government Lot 4, but title could be lost by adverse possession. We must remand to the trial court for further proceedings, including the taking of additional testimony, if needed, and for further findings of fact, not inconsistent with this opinion.

D.L. MUNRO, J., concurred.