282 . CONIFEEALES INCERTAB SEDIS [CH. 



Walchia imbricata Schimper. 



In habit this type^ closely resembles the foUage-shoots of 

 Araucaria Rulei on a smaller scale, the crowded leaves being 

 strongly incurved and imbricate: it is readily distinguishable 

 from UUmannia ^nni Goepp. (fig. 750, D, E). A good example 

 is figured by Zeiller^ in which the branches are unusually large, 

 8 mm. — 1-2 cm. in diameter: the species occurs in Permian and 

 Stephanian strata and is recorded by Kidston from the Upper 

 Coal Measures of central England. 



Walchia Schneideri Zeiller. 



This species^ from Charmoy is characterised by the long 

 filiform leaves, -6 mm. broad and 1-2 cm. long, usually straight and 

 decurrent. The ultimate branches, some of which bear compara- 

 tively long and slender cones, are oblique and alternate as in 

 W. piniformis. W.foliosa Eich.* from the Permian of Rassia is a 

 similar form but with less delicate leaves. 



Walchia frondosa Renault. 



A species from the Permian of Autun having slender leaves 

 rather shorter and more falcate than those of W. Schneideri: 

 some of the branches bear a terminal globular bud superficially 

 resembling the ovuliferous shoot of Taxus. It is, however, not 

 improbable that the buds are purely vegetative like those figured 

 by Bergeron on a specimen of W. ■piniformis. 



SCHIZODENDRON. Eichwald. {TYLODENDRON Weiss.) 



Prof. C. E. Weiss^ instituted the generic name Tylodendron for 

 casts from Upper Carboniferous and Permian strata in Germany 

 which he described as branches of a Conifer with spirally arranged 

 rhomboidal raised areas or pulvini each of which has a median 

 slit in its apical portion (fig. 746). The elongate, narrow, raised 

 areas (c/. the medullary cast of a Voltzia, which shows precisely 

 similar areas, represented in fig. 748) were regarded as casts of leaf- 

 cushions and the slit was interpreted as a resin-canal. 



1 Schimper (72) A. p. 239. ^ ZeUler (06) B. p. 211, PI. XLix. figs. 1, 2. 



3 Ibid. p. 206, PI. XLvm. figs. 4, 5. 



^ Eichwald (60) B. PI. xix. fig. 1. 



^ Weiss, C. E. (72) p. 182, Pis. xix., xx. 



