216 Systematic Paleontology 



ScHiz^opsis AMEEiCANA Berry 

 Plate XXII, Figs. 1-9 



Baieropsis expansa Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, 



pi. Ixxxlx, fig. 1 (non fig. 3; pi. xc, fig. 1; pi. xci, fig. 2; pi. xcii, fig. 5, 



which are referred to Acrostichopteris expansa). 

 Baieropsis macrophylla Fontaine, 1890, Mon. U. S. Geol. Surv., vol. xv, 1889, 



p. 212, pi. xc, fig. 6. 

 Schizwopsis expansa Berry, 1911, Annals of Botany, vol. xxv, p. 194, tf. 1, 



pi. i, figs. 1-6. 



Description. — Fronds relatively large, about 11 cm. in length by 6 cm. 

 in width, apparently short stalked, divided almost to the base into two 

 principal ribbon-like divisions, which, in turn, are almost immediately 

 subdivided dichotomously into two similar subordinate divisions which are 

 diehotomously forked in a like manner at varying heights. In the nearly 

 complete specimen figured from which the restoration has been made, 

 the outer main division of the frond is somewhat less developed and less 

 cut up than the inner main division. The texture is coriaceous. The 

 veins are thin but strong, in some specimens suggesting a double vascular 

 strand; they fork dichotomously near the region where the frond forks, 

 and then repeatedly at varying intervals, but they are, for the greater 

 part of their course, unbranched and approximately parallel. They are 

 somewhat more numerous than in the comparable modern species of 

 Schizcea. The fructifications, as preserved, are brownish, spindle-shaped 

 bodies about 4 mm. in length and 1 mm. in diameter. They were ob- 

 served and figured by Fontaine in the specimens named by him, Baierop- 

 sis macrophylla, and were considered to be of a pathological nature, i. e., 

 fungal, but were not noticed on the specimen which he included under 

 Baieropsis expansa^ although they are readily seen in the figure here 

 reproduced, which is from a photograph of the specimen from which 

 Fontaine drew his fig. 1 on pi. Ixxxix, of the Potomac flora. These 

 fructifications are borne at the distal ends of certain of the veins at 

 varying heights, usually along the margins, but occasionally on the face 

 of the laminge. Ordinarily they are massed toward the distal ends of 

 the ultimate divisions of the frond, as in the modern Schizcea elegans, 

 the ultimate ones appearing as continuations of the ultimate teeth which 



