. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. BVNDLE-SYSTEM IN THE LEAVES. 303, above described (p. 265) in the halms of many Monocotyledons have the same course as in the leaves. It is only rarely that in leaves of Monocotyledons single transverse branches end blindly in the surrounding tissue. It is more commonly the case for a longitudinal bundle to arise as a branch from one of them. The huge leaf of Welivitschia is traversed longitudinally by very numerous strong parallel bundles, these being con- ne^cted in a ladder-like manner by tra
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. BVNDLE-SYSTEM IN THE LEAVES. 303, above described (p. 265) in the halms of many Monocotyledons have the same course as in the leaves. It is only rarely that in leaves of Monocotyledons single transverse branches end blindly in the surrounding tissue. It is more commonly the case for a longitudinal bundle to arise as a branch from one of them. The huge leaf of Welivitschia is traversed longitudinally by very numerous strong parallel bundles, these being con- ne^cted in a ladder-like manner by transverse branches. The transverse branches either run at right angles from the longitudinal bundles, or obliquely, and sometimes directly and simply from one longitudinal bundle to the other, some- times converging and anastomosing one with another in the narrow intervening spaces. Here and there a transverse branch ends freely in the parenchyma, without reaching the next longitudinal bundle; and from each of the transverse connections there often starts one short branch, which also ends blind in the parenchyma, and is always directed to- wards the base of the leaf (Fig. 145). The bundle-system is accordingly similar in most points to that of the longitu- dinally striated Monocotyledons, but the numerous internal free ends correspond to the usual condition in the reticulate Dicotyledons.âIn the leaves of the above-named species of b Eryngium only transverse branches between the parallel longi- â¢'â c- i4s âweiwirscUa mirabiiis; . J. 1 i_ jt J. :i ⢠, 1 . â¢! t 1 piece of the network of vascular. tudmal bundles are round ; m other similar narrow-leaved bundles m the leaf, prepared free; species, as E. aquaticum, there are also free endings and reti- '^^''^f^^ ileart^tht tee'ofthe'^ culate anastomoses. leaf- {b) In the reticulate type (Fig. 146) the bundles which enter the leaf undergo branching of higher or lower order, and the branches are distributed over the whole su
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Keywords: ., bookcentury1800, bookdecad, booksubjectplantanatomy, bookyear1884
