. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. I04 CELLULAR TISSUE. walls. The other part of these cells however becomes expanded to form a great oval bladder which intrudes deeply into the sub-epidermal parenchyma. As soon as the processes of expansion and division in the neighbouring cells begin, there grows from the middle of the thickened outer wall, perpendicularly into the interior, a peg-shaped process (consisting of cellulose), the blunt end of which swells into a knob {£). When the leaf is fully developed {E) the swelling has the f
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. I04 CELLULAR TISSUE. walls. The other part of these cells however becomes expanded to form a great oval bladder which intrudes deeply into the sub-epidermal parenchyma. As soon as the processes of expansion and division in the neighbouring cells begin, there grows from the middle of the thickened outer wall, perpendicularly into the interior, a peg-shaped process (consisting of cellulose), the blunt end of which swells into a knob {£). When the leaf is fully developed {E) the swelling has the form of an egg-shaped or almost spherical body, which attains a size filling half or more than half of the cell. This is the cystolith, which is thickly covered on its exterior with pointed and blunt radially diverging conical warts, and is suspended in the cavity of the bladder-like cell by an irregularly cylindrical stalk, which is continuous directly into the original thickened outer wall. The whole body is impregnated with calcium carbonate, and. FIG. 44.âFicLS elastica; leaf, transverse section, eâe in earli ^=c. tl,« .f i side i W, (390) nnder side of tire same very young leaf'l^ A an °,lr^,H ""f''''^^ "f "-e epidermis; A (600) npper and a Hair (transient); in A two cystolith-eellsfrecoinisabie hv fh!r7,v'?'' I ='°°"'' ^'''"^ "'""'"^ superlieial, ^ (600) npper, B, (300) under side of a r«W ^M , '"'".?"=''="'='' <"'«=â ⢠"all, epidermal cells- as yet a younger and ., an oL^ sAgT^:ZsSSS,^ii^^',^^^'\^'' 'P'^="°=l cells undargoiâB divUion. In J, i is leaf, under side; division of the now three-layered^tJder^Ts if * J^ w â¢^''"?«»« "f ^e (390) older and form Of the parts is notyet u^ppersTd'/^J^'^a^t^^TSIoir^^^^^^^^^ the stalk also with silica: it has a homogeneous glassy appearaiice, and in the pointed warts th
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Keywords: ., bookcentury1800, bookdecad, booksubjectplantanatomy, bookyear1884
