DESCKIi'TlON OV SPECIES— FILICES. 51 



S p iic II o ptcri s nigricans, Lesqz. 



Plate II, Figs. 4-r)a. 



S2)hcnopterin nigricans, Losqx., Annual Report, 1873, p. 394. 



Frond polypinuate ; primary pinna) narrow, linear (as ninch as can be seen from tlio fraj^ment); 

 tertiary i(iiiii:e at a rijjlit an^le of diverfjenco from a sli^litly winded raeliis, short, sessile, linear, 

 abruptly rounded to a small, obtuse, terminal lobe; piunately diiiiply lobed ; pinnules in ri;;ht angle lo 

 the racbis, distinet to near their base, oblong, obtuse, d<^eply uiululate on the borders; middle vein 

 scarcely distinct, alternately piunately divide<l in four to six pairs of veiulets, curving in passing to the 

 borders, forking once, except the upper pair, which is simple. 



The specimens are mere fragments ; the largest part (fig. 4) shows what 

 appears to be the middle of a pinna of second order, with alternate short divis- 

 ions two and a half centimeters long or a little more, one centimeter broad, 

 in right angle to the rachis, or very open, deeply undulate on the borders. Tiie 

 surface was apparently covered withacoatingof short hairs, as it is punctulate 

 and always colored black. 1 do not know any recent species of Ferns to which 

 this one is comparable ; its nervation is like that of some Ci/athea. Except 

 for its deeply undulate lobes, it is like Pteris hlechnoides, Heer, Flor. Tert. 

 Helvet., p. 40, pi. xii, fig. 8. 



Habitat. — Golden and Black Butte ; always found in small fragments. 



HYMENOPHYLLUM, Klf. 



Ily lucnop ii y 1 1 uin coufiisuni, Lesqz. 



Plate II, Figs. G-Ca. 



Hymenophylliim confusum, Lesqs., Annual Report, 1873, p. 395. 



Frond polypinnate; primary rachis thick, grooved ; ultimate pinna) lanceolate, deltoid in outline; 

 pinnules simple or bitid, cuneiform, enlarged upward from a decurring base, lobed ; lobes short, oblong, 

 obtuse, simple, bifid or emarginate; veins dichotomons; branches simple, each entering one of the divis- 

 ions of the pinnules. 



The description is made from fragments, the species being represented 

 only by crushed parts of the frond mixed together and pressed upon another 

 in a confused mass. The largest portion discernible is the one figured. The 

 primary rachis is not represented, the fragments being too small, and irregu- 

 larly crushed ; the pinna; are apparently broadly lanceolate, divided to a dis- 

 tance from the rachis in pinnules, cuneate to their decurrent base, enlarged 

 and curved backward at the upper part, either simple and lobed or cut in two 

 divisions, as in the lower part of fig. 6. The lobes are either simple, oblong, 

 obtuse, or enlarged, and emarginate at the upper part into two equal, half- 

 round obtuse division's; the veins, simple and decurrent to the rachis, at the 

 base of the pinnules are dichotomous in ascending each of the ultimate divi- 

 sions, reaching the borders of one of the lobes, as seen in fig. Ga. When looked 



