FLORA OF THE SHASTA FORMATION. 239 



direction tliey diverge and fork dichotomously at long intervals, this fork- 

 ing not diminishing their size. This nervation is much like that of Haus- 

 mannia, but the forking takes place at shorter intervals than in Bunker's 

 species. The secondary nervation is very obscure, and all nervation of 

 lesser rank is not shown. The secondary nerves, which are occasionall}^ 

 vaguely shown, appear to stand nearl}' at right angles with the primary 

 ones. The surface of the fragment of the leaf is granulated as if from sori 

 scattered over it. The details of these could not be made out. This 

 granulation, if caused by sori, together with the primary nerves, suggests 

 an affinity Avith Hausmannia, but the true place of the plant is very 

 problematic. 



Family MARATTIACE.E. 



Genus ANGIOPTERIDIUM Schimper. 



Angioptekidium canmorense Dawson.? 



PI. LXVI, Figs. 1-4. 



1892. Angiopteridium canmorense Dn.: Trans. Roy. Soc. Canada, Sect. IV, Vol. X, 



p. S3, fig. 2 on p. 83. 

 1894. Angiofteridimn nervosum Font.? in Diller & Stanton: Bull. Geol. Soc. Ain., 



Vol. V, p. 450. (PL LXVI, Fig. 4.) 

 1894. Angiofteridium canmorense Dn. ? Font, in Diller & -Stanton: Loc. cit. 



(PI. LXVI, Fig. 1.) 

 1895 [1896]. Angiopteridium nervosum Font.? in Stanton: Bull. U. S. Geol. Surv., 



No. 133, p. 15. (PL LXVI, Fig. 4.) 

 1895 [1896]. Angiopteridium canmorense Dn.? Font, in Stanton: Loc. cit. (PL 



LXVI, Fig. 1.) 



Sir William Dawson" has described from Canmore, in the Cascade 

 coal basin of the Rocky Mountains, a fern that is much like a plant found 

 in several specimens at some of the California localities. As, however, 

 the specimens from California are all in the form of detached pinnules, 

 which in every case are in fragments, the material does not suffice for 

 positive identification. The California plant, however, shows several of 

 the characteristic features of Angiopteridium canmorense. The pinnules 

 have the same narrow form, rigid aspect, and comparatively very stout 

 midrib prolonged to the ends of the pinnules. The lateral nervation is 



" Correlation of Early Cretaceous Species, p. 8.3, fig. 2. 



