270 BOTANICAL GAZETTE [ OCTOBER 
leaves ovate lanceolate to oblong lanceolate, erect, acuminate, 
costate, costa excurrent. 
Sporophyte usually large, 1.5 to 4°™ long: seta stout, 200 to 
280m in diameter, dark purple below, reddish above; central strand 
equaling in diameter the largest cells of the ground tissue, 304, 
composed of ten to eighteen rows of cells; cortex of two to three 
layers of cells 8.6 to 12.8 in diameter; cells of ground tissue 
varying from 18.5 to 30min diameter, the largest found about mid- 
way between the cortex and the central strand: capsule oblong or 
cylindrical, asy tric, rarely almost symmetric, slightly inclined 
to strongly incurved, suberect to horizontal, generally strongly 
constricted under the mouth when dry; collum one-third the 
length of the sporangium; cells of exothecium mostly paren- 
chymatous, more or less prosenchymatous on the convex side, 
cells on the convex side varying from 15 to 55m wide and from 
55 to 165m long,averaging 30m wide by 120» long, cells of con- 
cave side 22 to 60p in width and 43 to 128m in length, averaging 
38 wide by 76p long, walls 2 to 4 thick, five to seven rows of 
cells under the mouth of the capsule isodiametric, or the three 
next the annulus slightly transversely elongated, 20 to 404 in 
diameter; stomata thirty to forty to the capsule, 44" wide by 
58 long, scattered; peristome teeth lanceolate, orange below, 
hyaline above, bordered, border narrow at base, becoming broader 
above, teeth entire or slightly serrulate above, transversely striate 
in the lower half or two thirds, papillose above; endostome 
shorter than the teeth, hyaline, papillose throughout, membrane 
three-fourths the length of the segments, the latter lanceolate to 
ovate-lanceolate, carinate, open along the keel between the artic- 
ulations, not gaping, cilia two to four, equaling the segments OF 
shorter, nodose; operculum apiculate from a highly convex or 
conic base; annulus broad, of two to three rows of cells: spores 
yellowish green, coarsely tuberculate, 15 to 21m in diameter: 
calyptra two-thirds the length of the capsule, split half its length. 
Has.: Along the margins of brooks, ponds, lakes and other 
similar places on the ground and on stones. Type locality 
England. 
