Cellular

Cellular plants, Cellular cryptogams (Bot.), those flowerless plants which have no ducts or fiber in their tissue, as mosses, fungi, lichens, and algæ. -- Cellular theory, or Cell theory (Biol.), a theory, according to which the essential element of every tissue, either vegetable or animal, is a cell; the whole series of cells having been formed from the development of the germ cell and by differentiation converted into tissues and organs which, both in plants and animals, are to be considered as a mass of minute cells communicating with each other. -- Cellular tissue. (a) (Anat.) See conjunctive tissue under Conjunctive. (b) (Bot.) Tissue composed entirely of parenchyma, and having no woody fiber or ducts.