WILLIAMS: CALYMPERACEAE OF NorTH AMERICA 391 
from the lower extremity of the thickened border for only a short 
distance downward into the basal part of leaf; cancellinae very 
broad above, mostly terminating in broadly acute angles or some- 
what rounded at the apex, scarcely as Iong as leaf-base; seta erect, 
5-6 mm. long; capsule about 2.5 mm. long, cylindric; calyptra 
persistent, very rough above; spores rough, up to 20 yu in diameter. 
[Fic. 6.] 
TYPE LocaLity: Nicaragua. 
DISTRIBUTION: Nicaragua and Guatemala. 
7. CALYMPERES HERIBAUDI Paris & Broth. in E. & P. Nat. Pfl. 1°: 
1189. 1909 
In dark green cushions with stems about 1 cm. high; leaves 
flexuous or crispate when dry, up to 5 mm. long, from an ovate 
base about 1.5 mm. long with margins finely serrulate in upper 
half and mostly entire below, narrowed to a point two to three 
and one half times longer with thickened, somewhat doubly 
serrulate. border extending from basal part to a little below the 
mostly blunt and serrulate apex; leaf-surface on upper side highly 
mamillose, on under side nearly smooth below and mostly papillose 
above; costa vanishing just below apex, smooth below, rough and 
often bearing propagulae on upper side near apex; cross-sections 
near middle of leaf show eight or nine guide-cells, stereid bands 
above and below, with outer cells differentiated, the blade of one 
layer of cells and a border of a cylindrical band of six to nine cells 
enclosing one or two stereid cells; cells throughout upper leaf 
mostly square to roundish, the median 6—-7 yu in diameter; teniolae 
wanting; cancellinae usually extending highest up next costa and 
terminating in acute angles; fruit unknown. [FIG. 7.] 
TYPE LocaLity: Panama near David. 
DisTriBuTION: known only from the type locality. 
This species is much like C. nicaraguense but has rather longer 
leaves, the basal margin more entire and without teniolae; also 
the thickened border contains a few stereid cells that seem to be 
wanting in C. nicaraguense, and the costa is mostly smooth on 
upper side. 
8. Calymperes Nashii Williams, sp. nov. 
_ In very thin, dusky green cushions or somewhat gregarious, 
with stems only 2 or 3 mm. high; leaves strongly incurved or 
crispate when dry, about 2.5 mm. long, oblong-linear from a 
slightly broader or not broader base; leaf entire with a thick, 
