Text-book of structural and physiological botany . Fig. 33. — Annular cellfrom an Opuntia withrings passing over intoa spiral band, (x 400.) Fig. 34- — Annular cellfrom the balsam, Bal-samina hortensis, withthe primary cell-wallbulging into a barrel-shape between therings, (x 400.) Fig. 35.—Piece of a re-ticulately pitted tra-cheide from the lime,Tilia grandifolia. (x400.) layers, are also called tracheides (Fig. 35); they occur, forexample, abundantly in the yew, lime, and Viburnum, The increase in thickness of the cell-wall takes a very peculiar formin the epidermal cells of many Urticace8e

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Text-book of structural and physiological botany . Fig. 33. — Annular cellfrom an Opuntia withrings passing over intoa spiral band, (x 400.) Fig. 34- — Annular cellfrom the balsam, Bal-samina hortensis, withthe primary cell-wallbulging into a barrel-shape between therings, (x 400.) Fig. 35.—Piece of a re-ticulately pitted tra-cheide from the lime,Tilia grandifolia. (x400.) layers, are also called tracheides (Fig. 35); they occur, forexample, abundantly in the yew, lime, and Viburnum, The increase in thickness of the cell-wall takes a very peculiar formin the epidermal cells of many Urticace8e and of some other plants. Inthe interior of specially enlarged cells, stratihed and finally club-shapedoutgrowths of the wall are formed, in which are deposited small crystals,scarcely or not at all distinguishable as such, of calcium carbonate () These clustered structures are known as cystoliths. Bodies of a simi-lar nature occur, though less frequently, in the pith, as in Kerria japo^ The Cell as an IndividnaL 21 nica. Of the same

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