11 



AlET. 



Alethopteris longchitica. Filicites loh chitica of Sternberg, 



7 



pCed^. 



91 Z^.\ 



1824. Flora der Vorwtii; ••adder's longae Jern."') Found by 

 Lesquereux (Coal Flora, p. 887, pi. 28, fig 7), in the Sub- con- 

 glomerate; Conglomerate anthracite coals D. E. F.; Bituminous 

 coals A, B, C ; that is, it is one of the early ferns of the coal age, 

 at least in America. — X/, X/7, XIIL — I. C. White collected it 

 from the Sharon shales {XII) in Lawrence and Mercer cos. Pa. 

 QQ, 97; QQQ, 53, 126, 160, 197. Note. This fern has received 



many names: Alethop- 

 teris lonchitidis^ vulga- 

 tior^ sternbergii^ distans 

 (see Geol. Pa. 1858, pi. 

 12, F2), Pecopteris lon- 

 chitica^ urophylla^ dav- 

 reuxii. Lesq. Coal Flora, 

 page 177. Alethopteris 

 distans was figured by 

 Lesquereux in Geol. Pa. 

 ■.^f J 1858, plate 12, F2, which 

 '^L^^IfU3^5^^2 is here added; but he 



says (Geol. Pa. p. 865) that his specimens might be referred 

 to other species. In A. lonchitica the shape, size and mode of 

 attachment of the leaflets are extremely variable; but they are 

 in general narrower and longer than those of other species, 

 lance-shaped all the way to the pointed end, and difi'erently 

 veined. Three distinct varieties of this species are noted by 

 Lesquereux. 



Alethopteris muricata. See Pseudopecopteris muricata, 

 XIII 



