672 WILLIAMS: MossES FROM TROPICAL AMERICA 
Leptodontium perannulatum sp. nov. 
Dioicous : & plant slender with bud-like flowers a little over 1 
mm. high, the antheridia 0.8 mm. long with rather abundant para- 
physes ; antheridial leaves costate, smooth, entire, ovate, acutely 
short-pointed : fertile plants in rather compact tufts with usually 
slightly branching stems up to 8 cm. high, dark-brown below, 
yellowish toward apex and with radicles mostly inconspicuous ; 
stem-leaves more or less twisted-carinate, spreading or recurved 
when dry, recurved from near base when moist, up to 3.5 mm. 
long, oblong-lanceolate, recurved on the margin below, gradually 
narrowed to an acute, irregularly serrulate apex with costa nearly 
percurrent ; cross-section of costa showing about 4 large cells with 
stereid bands of about one row of cells above and two rows below ; 
cells of leaf-base yellow, linear, smooth with sinuously thickened 
lateral walls, cells above papillose, mostly irregularly oblong with 
much thickened walls, the median cells about 6 y by 10 4; peri- 
chaetial leaves up to 10 mm. long, smooth, costate to near apex, 
sheathing over one half up, gradually narrowed to a flexuous, dis- 
tantly serrulate apex: pedicel 1 cm. high ; capsule ovate-cylind- 
rical, slightly curved and nodding, small-mouthed, 3 mm. long with 
a stoutly-beaked lid 0.8 mm. long ; peristome-teeth lanceolate, 0.2 
mm. long, pale golden-brown, glabrous, articulations often indis- 
tinct, more or less irregularly split longitudinally ; annulus broad 
persistent, 7 or 8 rows of cells high, the upper rows of loosely 
cohering cells ; spores rough, up to 22 # in diameter. 
Volcan de Agua, on sheltered rocks, 3400-3750 meters, March 
22, 1905, H. Pittier (g2). This species is near L. drevisetum Mitt., 
from which it may be distinguished by the leaf-cells. In Z. brevi- 
setum the median cells are smaller (mostly 5 pt by 5 to 6p) scarcely 
elongated or often slightly transversely elongated and with cell- 
walls thinner and straighter. In the Mitten herbarium a few frag- 
ments of this apparently undescribed species were found, evidently 
from the same locality as Pittier’s specimens, but without date of 
collector, and were on the same sheet with Z. drevisetum. 
CUBAN MOSSES COLLECTED BY W. R. MAXON 
Holomitrium Maxoni sp. nov. 
Inflorescence not determined: plants in rather dark-gree? 
tufts with stems, bearing few branches, up to 8 mm. high: leave 
when dry, incurved-imbricated with margins above rolled in, when 
moist, more or less recurved and widely spreading, in outline nearly 
linear, up to 2.5 mm. long and 0.4 mm. wide, the apex mostly 
