BOTANICAL GAZETTE 
APRIL, 1896. 
Notes on the North American species of Plagiochila. 
ALEXANDER W. EVANS. 
WITH PLATES XV AND XVI, 
_ Only two species of Plagiochila are attributed to our limits 
inthe first part of the Synopsis Hepaticarum, published in 
1844, and the first of these two, P. porelloides, must be con- 
sidered a form of the second, P. aspleniotdes. Three years 
in the supplement to the same work, five addi- 
“ese, P. macrostoma, must be regarded as a synonym of P. 
‘ while the fifth species, P. nodosa Tayl., likewise 
Published in 1846, is one of the many forms of P. asplen- 
i Only four valid species, therefore, are left to our 
tdit:—p, asplenioides, P. interrupta, and Sullivant’s two 
‘Pecies, PL undata and P. Ludoviciana. 
Species, P. spinulosa, is described in Sullivant’s 
1856 nd Hepatice of the United States,” published in 
are ut the Specimens from which the description is drawn 
ni *ty different from the true P spinulosa (Dicks.) Dum. 
cent sae the type of a new species. In Dr. Millspaugh’s re- 
ay oo West Virginia,” a sixth species: is: added, and 
and 
The 
that it Plagiochil<e so rarely produce organs of fructification 
hape and arrangement of the leaves, the pe- 
Cir margins and of their cells are all of 
No. 4. 
[185] 
