Section 81FF. So far as land which has not been registered in the land court is affected by the subdivision control law, recording of the plan of a subdivision in the registry of deeds before the subdivision control law was in effect in the city or town in which the subdivision was located shall not exempt the land within such subdivision from the operation of said law except with respect to lots which had been sold and were held in ownership separate from that of the remainder of the subdivision when said law went into effect in such city or town, and to rights of way and other easements appurtenant to such lots; and plans of subdivisions which were recorded in the registry of deeds and subdivisions made without the recording of a plan after said law had gone into effect in such city or town and before February first, nineteen hundred and fifty-two, without receiving the approval of the planning board of such city or town, shall have the same validity and effect as if the subdivision control law became effective in such city or town on February first, nineteen hundred and fifty-two, as above provided.

So far as land which has been registered in the land court is affected by said law, any plan of a subdivision which has been registered or confirmed by said court before February first, nineteen hundred and fifty-two, whether the subdivision control law was in effect in the city or town in which the subdivision was located or not, and whether the plan of the subdivision was approved by the planning board or not, shall have the same validity in all respects as if said plan had been so approved, but the land court shall not register or confirm a plan of a subdivision in a city or town in which the subdivision control law is in effect which has been filed on or after February first, nineteen hundred and fifty-two, unless it has first verified the fact that the plan filed with it has been approved by the planning board, or would otherwise be entitled if it had related to unregistered land, to be recorded in the registry of deeds. The land court shall have jurisdiction in so far as affects land registered or to be registered or confirmed under chapter one hundred and eighty-five, to determine whether the subdivision control law has been complied with, and shall verify before registering or confirming any plan of land in any city or town in which the subdivision control law is in effect, that the plan filed with it is entitled to be recorded in accordance with the subdivision control law, and every plan heretofore or hereafter registered or confirmed by the land court pursuant to said chapter one hundred and eighty-five shall for the purposes of the subdivision control law be deemed to be, and shall be invested with all the rights and privileges of, a plan approved pursuant to said law. In case of conditions imposed pursuant to section eighty-one R or eighty-one U of said law, and set forth or referred to by endorsement on the plan filed with it, the land court shall cause said conditions to be set forth or referred to on the plan prepared by it therefrom for registration or confirmation, or in the decree of registration or confirmation or certificate of title issued for the land shown thereon.