39 
wide, apex cucullate, rounded, entire or serrate, vein ending below 
it, not filamentous at base ; margins serrate only above the middle, 
not bordered, the cells only slightly larger and darker, upper cells 
irregular, 10-013 mm.; basal rectangular, rarely a few prosen- 
chymatous cells. were seen just inside the basal margin, mostly 
pale and rectanglar. Spores .o48-.050 mm., smooth, brown. 
On consulting the original description and plate, we find that 
Scouleria aquatica was originally described as black, and the type 
specimens are quite as dark as Macoun’s specimens of var. nigres- 
cens, thus invalidating the first and most conspicuous character of 
that variety. The leaves are described as dark green, the upper 
ones only as green. The border of the margin is indicated by 
submarginal lines in figures 2—3 of the original plate. 
The specimens distributed in our set and Prof. Macoun’s of 
Drummond’s Mosses No. 63 differ from Scouler’s and from each 
other slightly. Prof. Macoun has three plants, two are 12-13 cm. 
long, large, coarse, simple stems, and sterile, with the leaves long 
and broad, coarsely serrate and bordered with yellow, the vein 
strongly filamentous, the submarginal basal cells yellow and pro- 
senchymatous, and the lower margins undulate. The third plant 
in his set is a small branching, fertile one, with black abraded 
leaves, shorter and denser, often entire, with the margins yellow 
and thickened. Our specimens of Drummond's No. 63 are like 
these, the leaves being only 2-2.5 mm. long, and differing from 
Scouler’s in their blunt, flat, entire apex with the basal cells more 
distinctly prosenchymatous and yellow. They were cited in the 
original description of S. aguatica. 
It seems evident from the above that, as originally founded, 
this species was recognized as variable, for we have indicated three 
discrepancies in the original specimens and descriptions. The 
larger forms may be referred to the variety migrescens Kindb., 
which may be distinguished by the taller plants, darker and 
coarser than the type, with long simple stems, large black leaves, 
often blunt and entire at apex, the basal cells yellow or brown, 
prosenchymatous, with the vein often thickened and serrate at 
apex and filamentous at base. 
Scouterta Nevi Miiller, Bull. Torr. Bot. Club, 17: 273 (1890). 
The description given in Macoun’s catalogue for S. Nevit is 
more than half devoted to S. aguatica, and from it we gather that 
