WILLIAMS: CALYMPERACEAE OF NorTH AMERICA 387 
Calymperes hexagonum Besch. Ann. Sci. Nat. VIII. 1: 286. 1895. 
Calymperes Hookeri Besch. Ann. Sci. Nat. VIII. 1: 287. 1895. 
Calymperes panamae Besch. Ann. Sci. Nat. VIII. 1: 298. 1985. 
In compact cushions with sometimes branching stems 5-6 
mm., or rarely up to 2 cm. high; leaves strongly incurved or crispate 
when dry, the lower short, ovate, about 0.75 mm. wide by 1.5 mm. 
long, the upper 3-3.5 mm. long, from a variable base, sometimes 
distinctly ovate or obovate and considerably wider than blade 
above, sometimes scarcely or not wider than above, and extending 
into a broadly acute or obtuse point, or those leaves bearing pro- 
pagulae narrowed above to a stout point without distinct blade 
and of variable length, with rounded apex; leaf-margin entire 
except along upper part of clasping base, which is more or less 
irregularly serrulate; costa stout, vanishing just below apex, 
rough on both sides above, slightly rough or smooth below the 
middle and bearing often on upper side at apex a dense cluster of 
narrowly spindle-shaped propagula, up to 250 u long with ten to 
fifteen cross-walls; cells of upper leaf mamillose, distinct, mostly 
roundish, 6-8 uw in diameter; teniolae two or three cells wide and 
one to five cells in from lower margin, extending nearly three 
fourths up leaf and running into the thickened border of upper 
leaf; cancellinae extending one third to one fourth up leaf, broad, 
mostly rounded above; perichaetial leaves much like stem-leaves 
but larger below with cancellinae extending higher up; seta erect, 
about 3 mm. long; capsule 1.5 mm. long, elongate-oval, smooth, 
without peristome; lid short-rostrate; calyptra persistent, plicate, 
rough toward apex, clasping the seta below capsule and split 
mostly along the middle on one side; spores rough, up to 35 u in 
diameter. [Fic. 1.] : 
TYPE LOCALITY: Guiana. 
DistRriBuTION: Florida, Panama and the West Indies to Brazil. 
2. Calymperes cubense Williams, sp. nov. 
_ Evidently dioicous: growing in compact tufts with mostly 
simple stems 6-8 mm. high; stem-leaves up to 3 mm. long, from a 
white, appressed, more or less obovate or obcuneate base rather 
gradually or somewhat abruptly narrowed into an oblong-linear 
to lanceolate, more or less acute point from shorter to about one 
and one half times longer than the basal part, the margins ser- 
rulate nearly all round and the point more or less crispate when 
ry; costa not quite percurrent, very rough on both sides to near 
the base, widest, 100 « or more, about half way up and tapering 
to a base about one half as wide, in cross-section near the middle 
