NEW OR INTERESTING MOSSES FROM PANAMA. 
By R.S. WrtraMs, 
The following mosses are from a collection made in the Province of 
Chiriqui, Panama, in the spring of 1911, by Mr. Wiliam R. Maxon, 
in connection with the Smithsonian Biological Survey of the Panama 
Canal Zone, and are here published in advance of a complete list 
which will appear later. Two of the species seem never to have been 
collected before. Of the other two, one was first obtained in Mexico 
by Schaffner in 1875, but has remained undescribed until now; the 
other was described as a Porotrichum by Carl Miller from sterile 
specimens collected in Guatemala. 
Specimens of the species here described are in both the U. S. 
National Herbarium and the herbarium of the New York Botanical 
Garden; those in the latter institution having served for actual 
diagnosis, may stand as the type specimens. 
Dicranoloma meteorioides R. 8. Williams, sp. nov. 
Apparently dioicous; in lax pendent tufts, with flexuous, somewhat branching 
stems up to 30 cm. long; leaves distant, three-ranked, 9 or 10 mm. long, 1 mm, wide 
a little above the base, spreading-flexuous, often spirally twisted above, distinctly 
serrulate three-fourths of the way down the margin or more, from an ovate base grad- 
ually narrowed toa slender, lanceolate, keeled point, with costa short-excurrent; costa 
just above the colored base of leaf 60 to 70 « wide, smooth throughout, in cross sec- 
tion near the middle showing about 4 guide cells with thin stereid bands on either 
side; alar cells brown, extending to the costa, about 20 » wide and from square to 
twice longer than wide, often with somewhat thickened walls; cells throughout the 
rest of the leaf mostly elongate, with thickened more or less sinuous and pitted walls, 
the median cells 8 to 10 » wide and 12 to 20 » long; perichetial leaves costate, the 
inner three or four from a convolute base, mostly abruptly narrowed to a serrulate, 
setaceous, erect point 3 or 4mm. long, inclosing 8 to 10 archegonia without paraphyses; 
seta smooth, 12 to 14 mm. long; calyptra (from very immature capsule) slightly 
rough above. 
Type LocaLiry: Humid forest between Alto de las Palmas and top of the Cerro 
de la Horqueta, Chiriqui, Panama; altitude 2,100 to 2,268 meters, March 18, 1911, 
Maxon 5499. 
DISTRIBUTION: Known only from the type locality, having been collected there 
also, at the same time, by Mr. H. Pittier. 
The specimens, pendent from branches of trees and shrubs, are in very immature 
fruit. 
Leucodon macrosporus R. 8. Williams, sp. nov. 
Dioicous, male flowers scarcely 1 mm. high, with numerous slender paraphyses and 
about 16 antheridia 0.5 or 0.6 mm. long; primary stems creeping, leafless, the secondary 
more or less erect, arcuate, 3 to 6 cm. high and about 3 mm. across, with somewhat 
spreading secund leaves; leaves ecostate, yellowish at base, about 2.5 mm. long, 
rather broadly ovate-lanceolate, acuminate, concave, 4-plicate, the borders more or 
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