422 Lesquereux's Descriptions of 



nately divided, dichotomous, pinnae decurrent, divisions short, 

 oval, acute ; nerves obsolete ; surface and margins covered 

 with long glandular hairs. 



48. Pa.chyphyllum laceratum (spec. nov.). Like the 

 former, but smooth, and with the divisions undulate and un- 

 equally toothed. 



49. Pachyphtllum lactuca, Lesqx. Schizopteris lactuca 

 Sternb. Frond pinnate ; pinnae lanceolate or broadly oval in 

 outline, pinnatifid ; lobes lanceolate, pinnately divided ; divi- 

 sions linear, obtuse ; nerves obliterate, parallel, and fasciculate 

 below ; simple in each division. 



Genus ASPLENITES. Gopp. 



50. Asplenites rubra (nov. spec). Frond bipinnate, 

 (or tripinnate?); pinnae broadly linear, half open, alternate ; 

 pinnules oval, oblong, united at the base ; medial nerve 

 strong ; nervules forking once near the base ; fruit dots linear, 

 placed in two rows between the margin and the medial nerve ; 

 rachis thick, not inflated. 



Genus ALETHOPTEEIS. Sternb. and Gopp. 



51. Alethopteris Pennsylvania (spec. nov.). Inferior 

 pinnae bipinnatifid, with short, round pinnules, united half 

 their length ; superior pinnae, pinnate only, with long lanceo- 

 late, linear, and undulate pinnules, slightly decurrent on the 

 rachis and united at the base ; medial nerve broad, canalicu- 

 late ; nervules perpendicular, slender, close, simple, or dicho- 

 tomous. 



52. Alethopteris distans (spec. nov.). Frond bipin- 

 natifid ; pinnae open, linear-lanceolate ; pinnules alternate, 

 linear, narrow, very distant, pinnately crenulate, enlarged at 

 the base ; united only in the upper part of the terminal pinnae, 

 where they become broader, shorter, and obtuse ; secondary 

 nerves obsolete. 



53. Alethopteris obscura (spec. nov.). Frond bipin- 



