184 SLOSSON: NEW FERNS FROM TRCPICAL AMERICA 
the smaller subdimidiate, serrate and decurrent; texture thin, 
membrano-herbaceous; pubescence white or whitish, setaceous, 
multicellular, the facial grooves of the stipes and the backs of the 
costae thickly coated with short fine soft hairs which spread part 
way up the midribs of the pinnules, larger coarser stiffer hairs scat- 
tered over the stipes, costae, backs of the veins on the under surface 
of the lamina, and between the veins on its upper surface; veins 
clearly visible, pinnate; sori apical on the veinlets, midway between 
the midvein and the margin of the lamina, sterile veinlets mostly 
extending almost to the margin; indusia glandular, not setose; 
sporangia glab arsely papillose. [PLATE 3, FIGURE I.] 
= 
Type in the Underwood Herbarium at the New York Botanical 
Garden, collected in Jamaica ‘‘1874-79.” 
The following specimens also are in the Underwood Herbarium: 
Jamaica: Mt. Diabolo, altitude 609 meters, April 2, 1903, 
Underwood 1825; vicinity of Hollymount, Mt. Diabolo, May 9; 
1903, Maxon 1957; vicinity of Hollymount, altitude about 750 
meters, May 25-27, 1904, Maxon 2311, 2260. 
Dryopteris leucochaete Slosson sp. nov. 
Rhizome creeping, slightly chaffy; fronds clustered, pubescent — 
and glandular; stipes up to 35.5 cm. long, brown and slightly — 
chaffy at base, above greenish to brownish, grooved on face; . 
scales soft, pale brown, lanceolate, acuminate, up to 3 mm. long, — 
with slightly ciliate or subglandular margins; laminae up to 20 — 
cm. long and 25 cm. broad, mostly subpentagonal, commonly — 
quadripinnate, abruptly narrowed above, apices mostly long- — 
acuminate and serrate; pinnae oblique, stalked, asymmetrical, © 
basal pair ovate-deltoid to deltoid; pinnules oblique, stalked to _ 
decurrent, several of the inferior elongate in the basal pinnae and 
shortened in the upper; segments oblique, stalked to decurrent, 
unequally ovate to subtrapezioid, cut away at base, pinnate OF 
obliquely pinnatifid to serrate; glands capitate, often jointed 
sometimes forked; pubescence white, setaceous, multicellular, fine 
and short hairs abundant on the groove of the stipe, backs of 
costae, and partly on the midribs of the pinnules, larger, coarsef 
scattered hairs on the general surface of the stipes, costae, 
backs of the veins, and between the veins on the upper surface 
of the lamina; veins pinnate; sori apical on the veinlets, mid 
between the midvein and margin of the lamina; indusia cons 
ously setose and glandular; sporangia glabrous; spores pa 
[PLATE 3, FIGURE 2.] 
a 
