. L'anatomie comparée des organes végétatifs des phanérogames marines et de fougères. L'anatomie des plantes phanérogames marines ; ; Fougères. ^^o PR/AKRAXGEMEAT MARV DES TISSUS. difterent dans certaines zones et des groupes. Des combinaisons qui sont ici possible les éléments suivants se produisent habituellement : (i) l'ensemble de la masse de cellules interstitielles, y compris la partie axiale cylindrique, reste à paroi mince et parenchymatous, e. g. les racines adventives de Tradescantia virginiana. Curcuma longa, et Clivia nobilis (Acorus calamus est intermédiaire, i. e. sa a une très forte du parenchyme des murs). (2) l'ensemble de la masse de cellules mentionné devient scler

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. Comparative anatomy of the vegetative organs of the phanerogams and ferns. Plant anatomy; Phanerogams; Ferns. ^^o PR/MARV AKRAXGEMEAT OF TISSUES. difterent in certain zones and groups. Of the combinations which are here possible the following usually occur: (i) the entire interstitial mass of cells, including the cylindrical axial portion, remains thin-walled and parenchymatous, e. g. adventitious roots of Tradescantia virginiana. Curcuma longa, and Clivia nobilis (Acorus Calamus is intermediate, i. e. its parenchyma has very strong walls). (2) The whole mass of cells mentioned becomes sclerenchymatous, e. g. Carex divulsa, Cyperus alternifolius, and no doubt most adventitious roots of Cyperacese and Grasses; also Curculigo recur- vata. (3) The tracts of cells between the xylem- and phloem-plates are sclerenchy- matous, forming together with them a dense firm ring around an axial strand of parenchyma, with intercellular spaces containing air: e. g. roots of Smilax (Sarsa- parilla) with very extensive parenchyma containing abundance of starch, most aerial roots of Orchidaceas (e. g. Epidendron ciliare, Oncidium sphegiferum), and many Palm roots (cf. Mohl, i.e.), in which scattered sclerenchymatous fibres may occur again inside the axial thin-walled parenchyma, e. g. Chamsedorea elegans. The pericambium remains in most cases thin-walled and parenchynjatous, even where it borders on sclerenchyma, though it may itself eventually be involved in the sclerosis, either wholly or in part; the former, for example, is the case in Sarsaparilla roots, the latter among Orchids, e.g. Epiden- dron ciliare, where opposite each xylem-plate two rows of its cells usu- ally remain very delicate, while the others, like those adjoining them on the inside, become greatly thickened. The usually one-sided sclerosis of the endodermis, which is very frequent, though by no means universally dis- tributed among long-lived Mono- cotyledonous roots, has been dis- cussed in Sect. 27. Deviations f

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