156 LEJEUNEAE OF THE UNITED STATES AND CANADA 
described above, and LZ. cavifolia. He quotes three ات‎ ۱ 
Hep. Bor.-Amer. 97, Musc. Amer. St. Merid. 171 ۸.۰۸۰ (caespites 
pallidi) and Musc. Alleg. 272; he also quotes two plants not dis- 
tributed in exsiccatae, Cleve's specimens from Catskill, New M : 
and Macoun's from Belleville, Canada. Of the first-mention ad 
specimen, Austin gives as a habitat, “on rocks and Me 
trees; chiefly on mountains." He does not tell, therefore, in w 
part of the country they were collected. The writer has 
ined this number in two sets of Hep. Bor.-Amer., and finds in E 
cases pale tufts, which are clearly Z. "Americana, and pese tu = 
which agree perfectly with the European specimens of Z. p 
quoted by Lindberg, as, for example, Hep. Eur. 435. Sullivan 
specimens from Charleston, South Carolina, are a poorly derum : 
form of Z. Americana. They show characteristic perianths, s 
1 1 ri i lo- 
their leaves and underleaves indicate that they grew in a moist 
cality, and their thin-walled leaf-cells, with small and often scarcely 
1 
i i i ond's . 
evident trigones, point to the same conclusion. Drumm: N 
. > ۳ y 100 An 
Louisiana specimens are also a poorly developed Z. Amer 
i i ut 
Cleve's specimens have not been examined by the writer, b 
specimens in the Underwood herbarium from Belleville, collected E | 
by Macoun, are typical Z. cavifolia. It is a little difficult to say | 
" , i d 
what should be considered the type of Lindberg's variety, and 
consequently of the present species. The writer would e 5 
however, that the pale tufts in Hep. Bor.-Amer. 72 be so regarded: — 
se 
Austin's plants are the first ones quoted by Lindberg, and the 
pale specimens, except for certain characters drawn from the le d 
cells, agree closely with the original description. 
i : 1 conc x 
Few of our species have been the cause of quite so much. d : 
It has been referred to L. id i E 
7 ; 1 2 7 n fy 
Euosmolejeunea duriuscula and also to Microlejeunea lucens a 
fusion as /. Americana. 
to be found under one or more of these various names (or theif 
equivalents ) in most of our large herbaria. 
The characters which se 
slight, are sufficiently distinct whe 
examined. Z., Americana isa 
the lobes of its leaves spread 
are relatively smaller, and the 
sinuous on their margin and 
more widely from the axis, the lobules 
tending to be rounded or subcordate 
ia ie 
ee 2 
parate it from ZL. cavifolia, ahoi a 
n well developed specimens è ۳ 
paler plant than the northern species, — 
less 
underleaves are broader, more or 
p ud 
