151 
of the American I mm., though I have found one plant whose 
leaves measured 1.4mm. The length of the acumination of the 
perichaetial leaves is also very variable. It may be that our forms 
of this and the next species are but two varieties of the European 
P. polyantha. The American polyantha answers very closely to 
the description of P. polyantha brevifolia Lindb. & Arnell, Musc. 
iae-bor. 152. 1890. I have seen the type specimens of P. 
heteromalla from Schimper's herbarium and not only are they 7. 
polyantha, but Schimper himself indicated oes on his labels that 
id not consider it a good species ; Drummond’s no. 222 on 
which this species was founded, is evidently Patek mixed as 
the Columbia Herbarium specimen is P. zufrzcata. 
1a. PYLAISIELLA POLYANTHA JAMESII (Sull) E. G. Britton, Bull. 
Torr. Club, 23: 230. 1896. 
Pylaisia Jamesit Sull. & Lesq. Musc. Bor. Am. Ed. 2. 383. 1865. 
Pylaisia subdenticulata obscura Lesq. & James, Mosses North 
America, 309. 1884. 
Gametophyte smaller than in the typical form ; leaves shorter, 
broadly ovate-lanceolate, shortly bicostate; length of leaf-cells 
4—6 times their diameter; quadrate alar cells numerous ; peri- 
chaetial leaves shorter, abruptly acuminate. Sporophyte with 
shorter subulate-lanceolate peristomal teeth, which are also shorter 
than the segments. 
On the ground and roots of trees. Chelsea, Mass. (James). 
This variety has the appearance of P. subdenticulata because 
of its reduced size, otherwise it has the characters of American 
polyantha, such as conic operculum and rudimentary cilia. 
1b. PYLAISIELLA POLYANTHA PSEUDO-PLATYGYRIA (Kindb.) Grout, 
Bull. Torr. Club, 23: 230. 1896. 
Pylaisia pseudo-platygyrium Kindb. in Macoun, Cat. Can. Pl. 
173 rag% 
Pylaisia filari-acuminata Kindb. |. c. 174. 
Leaves narrowly long-acuminate; upper branch leaves dis- 
tantly serrate-dentate along sides of acumination ; inner perichaetial 
leaves often long-acuminate, serrate-dentate along the acumina- 
tion ; cilia 1 or 2, better developed than in the type. 
Type locality, shores of Lake Nipigon, Ontario. Also found 
on the west side of the Columbia river at Revelstoke, B. C. 
On decayed trunks and on “logs subject to inundation.” 
a 
