iNowLTON.j DESCRIPTION OF SPECIES. 19 
ASPLENIUM WYOMINGENSE II. sp. 
PI. Ill, fig. 12. 
isplenium? n. sp. Kn., Bull. Geol. Soc. Am., Vol. VIII, p. 140(1897). 
Frond pinnate; rachis delicate, striate; pinnae oblong-lanceolate, 
iroadest above the middle, thence tapering above to an obtuse apex 
md below to a wedge shaped base; margin entire below, rather re- 
aotely toothed above, the teeth small, sharp, upward-pointing; mid- 
r ein thin, striate; veins at an angle of about 40°, moderately close, 
parallel, simple, or mostly once-forking at or very near the midvein; 
ruit unknown. 
The specimen figured is, with the exception of a small fragment, all 
hat was found of this species. It consists of a portion of the rachis, 
bout 1 cm. in length, and parts of two pinnae. The most perfect 
inna is 5 cm. in length, and 1.5 cm. in width at the broadest point, 
diich is just above the middle. This species is evidently closely re- 
tted to what Lesquereux called Osmunda affinis. x It differs in being 
liarply serrate, and in having closer veins, which branch near the mid- 
ein and usually again near the margin. 
It is very similar to certain of the forms that have been referred to 
Uteris subsimplex Lx., 2 but this latter is only a very small, imperfect 
sample of a large, different- appearing fern. It is also suggestive of 
hat has been called Pteris erosa Lx., 3 now Asplenium erosum, but this 
tter differs in being twice the size, and in having more numerous 
id blunter teeth and twice-forking veins. It would, therefore, seem 
arrantable to keep them distinct, at least until more material can be 
)tained. 
Habitat. — Near old stage road, on north fork of Dutton Creek, be- 
reen Rock and Cooper creeks, Wyoming. Collected by Knowlton, 
;anton, and Knight, 1896. 
Asplenium tenellum n. sp. 
PI. Ill, figs. 1, 2. 
I Fronds slender, of delicate texture, outline unknown; bipinnate; 
chis slender, slightly flexuose; pinme opposite or alternate, lanceo- 
i ce in outline, pinnatifid, with few coarse, blunt lobes; veins slender, 
?king, about one to each lobe. 
The fragments figured represent all that was found of this form, 
was a slender, delicate fern, at least twice pinnate, but the true 
tline can not now be determined. The pinnules are somewhat 
ate lanceolate in outline, with few large, rather blunt lobes. 
This species has some resemblance to Asplenium tenerum Lx., 4 from 
3 Fort Union beds of Dakota. 
• Tert, PI., p. 60, PI. IV, fig. 1. 3 ibid., PI. IV, fig. 8. 
* Ibid., PI. IV, fig. 6. •» Cret. and Tert. PL, p. 221, PI. XLVI, A, figs. 1-3. 
