. Fossil plants : for students of botany and geology . Paleobotany. XLV] SCmZODENDRON 283 Schizodendron speciosum (Weiss). One of the casts figured by Weiss and assigned by Mm to this species has a length of 70 cm. and at intervals of about 30 cm. shows periodic swellings where it assumes a barrel-shaped form. Pieces of wood attached to some of the casts were investigated by Dippel who found that they agreed anatomically with Araucarian stems. Weiss considered his specimens to be generically identical with casts figured by Eichwald'^ from Russia as species of Schizodendron and Angiodendron. Po
. Fossil plants : for students of botany and geology . Paleobotany. XLV] SCmZODENDRON 283 Schizodendron speciosum (Weiss). One of the casts figured by Weiss and assigned by Mm to this species has a length of 70 cm. and at intervals of about 30 cm. shows periodic swellings where it assumes a barrel-shaped form. Pieces of wood attached to some of the casts were investigated by Dippel who found that they agreed anatomically with Araucarian stems. Weiss considered his specimens to be generically identical with casts figured by Eichwald'^ from Russia as species of Schizodendron and Angiodendron. Potonie, while uncertain as to the close agreement with some of Eich- wald's fossils, regarded Tylodendron as identical with Eichwald's Schizo- dendron, and Zeiller^, in view of this agreement, adopted the older name Schizodendron. The latter author^ formerly believed Tylodendron, as described by Weiss, to be • distin- guished from Schizodendron by the apical occurrence of the slit on the so-called leaf-cushion in contrast to the basal slit in Schizodendron, but Potonie* proved that in both cases the median groove extends up the lower portion of each projecting Fia. 746. ScUzodendrm specio- area from its base and represents ««»• (After Potonie; f nat. an out-going leaf-trace; he also demonstrated that Schizodendron is a pith-cast, the tapered areas being the inner ends of medullary rays. In some specimens the casts afford some indication of a discoid pith. The relation between the wood and the pith-casts is also very clearly shown in a section of a petrified stem of Permian age from Prince Edward Isla-nd described bv Miss Holden^. The true nature of. 1 Eiehwald (60) B. PI. xvtn. 3 Ibid. (80) p. 263, PI. v. 5 Holden, R. (13) p. 245. a Zefller (92^) A. p. 102. « Potoni^ (88).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
