. Comparative anatomy of the vegetative organs of the phanerogams and ferns. Plant anatomy; Phanerogams; Ferns. 1 U -3- 1 If s 230,231 —Transverse sections through stems of not exactly defined species of Seijania or Paullinia Naturil size I roni ab outer rings; c the main ring of the compound woody body. The cortex is white in both figures, tlie Kj'ein (in the strict sense) dotted according to the distribution of the vessels. Medullary rays obvious in 1 ig 231, in 230 not obvious ; also the pith is not .shown in the outer rings of the latter figure. Fig. 232.—Serjania caracas
. Comparative anatomy of the vegetative organs of the phanerogams and ferns. Plant anatomy; Phanerogams; Ferns. 1 U -3- 1 If s 230,231 —Transverse sections through stems of not exactly defined species of Seijania or Paullinia Naturil size I roni ab outer rings; c the main ring of the compound woody body. The cortex is white in both figures, tlie Kj'ein (in the strict sense) dotted according to the distribution of the vessels. Medullary rays obvious in 1 ig 231, in 230 not obvious ; also the pith is not .shown in the outer rings of the latter figure. Fig. 232.—Serjania caracasana. Transverse section through a young internode just above the node (lo). After Nageli, Within the ring of sclcrenchyma .r are the main ring h and four outer rings : to the left below is one outer ring opening into the main ring. The dark prominences of the rings poinding towards the pith are the primary bundles of the leaf-trace. Indications of a similar formation appear, according to Sanio\ to occur in Rumex crispus, but further investigations are necessary on this point. Sect. i88. Several partial cambiums and rings of growth, lying side by- side in the same transverse section, appear in the most exquisite development in the woody stems, so often described since Gaudichaud ^ of climbing Sapindacese of the genera Serjania, Paullinia, and Thinouia. The transverse section of the stems in question shows several separate rings of wood surrounded by a common cortex, and in most of them a larger main ring occupying the middle, and several smaller outer rings arranged in a circle round it (Figs. 230, 231); more rarely five, or in exceptional * Botfin. Zeitung. 1865, p. 179. ^ Recherches, &c. /. c. Tab. XVIII.—Compare further A. de Jussieu, Monogr. des Malpighi- acees, /. r.—Schleiden, Grundziige (3 Aufl.) II, p. 166.—Treviranus, Botan. Zeitung. 1847, p. 393. —Criiger, Botan. Zeitung. 1851, p. 401.—Schacht, Lehrbuch, 11, p. 58.—Netlo, Comptes rendus, torn. 57 (1
Size: 1587px × 1574px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecad, booksubjectplantanatomy, bookyear1884
