1896.] North American Species of Plagiochila. 187 
I, PLAGIOCHILA INTERRUPTA (Nees) Dum. Rev. Jung. 15. 
1835. 
P. macrostoma Sull. Musci Alleg. x. 227. 
P. interrupta differs from all our other species in several 
important respects. As a result of its prostrate habit, its 
leaves spread horizontally and are almost flat, so that the 
plant has much the appearance of a Chiloscyphus, while in 
itsinflorescence it is autoicous and not dioicous as in typical 
Plagiochilze. Lindberg considered these differences sufficient 
‘0 separate it from the rest of the genus, at first as a subgenus, ? 
but afterwards as a distinct genus to which he gave the name 
of Pedinophyllum.2 This genus is maintained by Schiffner, * 
but, as Spruce* points out, the characters assigned to it are 
carcely of generic value, though it might be well to consider 
them of subgeneric. Lindberg himself had little faith in its 
validity; four years after its publication, he placed P. znter- 
"pia in Mitten’s genus Leptoscyphus. § i 
Plagiochila macrostoma was first definitely referred to P. in- 
terrupta by Austin, ® though even Sullivant had doubted the 
Permanence of his species. His specimens were found on old 
logs and on shaded banks instead of on calcareous rocks where 
' imerrupta usually grows in Europe, but they agree pretty 
with European specimens. The principal difference 
S$ not been collected recently in the United States. 
4 1geACHOCHILA ASPLENIOIDES (L.) Dum. Rev. Jung. 
35. 
pberelloides (Torr.) Lindenb. Spec. Hepat. 61. p/. 72. 
A nodosa Tay). Lond. Journ. Bot. B: 268. 1846. 
tudes, ac uides is very widely distributed in northern lati- 
Stones j 
falls 
together or scattered among other bryophytes. Speck 
QS var 5 
Y Sreatly in size, in the position of their leaves, and 
‘Not. 
CE Aer Pre F. et Fl. Fenn. 13: 366. 1874. 
*Englerp ge Sci. Fenn. 10: 504. 1875. 
Ms. : -. Aan Pattirlich 20 PAanzenfamilien 91: 89. 1893. 
apie iScand, 4. 1 79. ssic 
“Ft. Bot. Club 6: 85. 1876, 
