274 BOTANICAL GAZETTE [OCTOBER 
25 to 32 long; perichetial leaves not essentially different from 
the others in shape and size, strongly costate, costa excurrent, 
cells zmcrassate, \eaves all strict. 
Sporophyte of medium size, 1.5 to 2.5°™ long, produced only 
on plants not submerged: seta stout, purple at base, paler almost 
yellow in upper third, 270 to 330m in diameter; cortex of three 
(occasionally four) layers of cells, these 6 to 15m in diameter; 
central strand 35 to 50m in diameter, composed of twenty to 
fifty rows of cells; cells of ground tissue 18 to 35 in diameter: 
capsule purple or dark chestnut brown, large, 2 to 4.5™™ long, 
cylindric or widening gradually from the base of the collum to 
the lid, asymmetric, incurved from an erect base, gradually 
cernuous, much shrunken in all parts and constricted under the 
mouth in drying; collum large,one-half to two-thirds the length 
of the sporangium ; cells of the exothecium parenchymatous for 
the most part throughout, sometimes more or less prosenchy- 
matous on the convex side, cells on the concave side 24” wide 
by 33 long, varying in width from 17 to 35 and in length 
from 21 to 50, cells of convex side 18 wide by 55» long, rang- 
ing from 15 to 30m wide and from 25.5 to 77 long; cell walls 
3 to 6m thick; cells under the peristome slightly smaller, two 
to four rows 8.5 to 30" long by 17 to 38.5 wide; stomata very 
numerous, ninety to two hundred to the capsule, crowded in @ com- 
paratively narrow band and often clustered, two to seven adjoining, 
commonly as broad as long or broader, average 37-54 wide by 
36m long; teeth of peristome yellow at base yellowish brown 
above to the slender hyaline tip, lanceolate, acuminate, irregu- 
larly serrulate in upper third, narrowly bordered, transversely 
striate on the back to the middle or beyond, coarsely and 
irregularly papillose in upper third; endostome pale and faintly 
papillose throughout, shorter than the teeth, membrane two- 
thirds to three-fourths the length of the segments, the latter 
lanceolate, carinate, open along the keel between the articulations 
or with only occasional perforations along the keel, cilia one to 
three, slender, weak, nodose, shorter than the segments; OP&T™ 
culum apiculate from a highly convex base: spores finely 
