juurtele ja mõningate taimede vartele iseloomulik steeli välimine üherakuline meristeemrakkude kiht
A cylinder of meristemal cells that lies just inside the endodermis and is the outer most part of the stele of plants. Common in the plant roots, can give rise to secondary roots.
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Peritsükli rakkudest võivad moodustuda külgjuured.
