82 NORTH AMERICAN, FLORA [VoLuME 16 
nate, above deeply pinnatifid, alate below the abruptly tong-acuminate apex, the costae 
clothed like the secondary rachis, a small tuft of araneose-fibrillose or laciniate rusty scales 
at the base; segments 16-18 pairs, 10-11 mm. long, 3.5-4 mm. broad, oblong, slightly fal- 
cate, obtuse, alternate, the lower ones slightly apart, the upper with narrow sinuses, the 
margins finely serrulate-crenate ; costules, veins and leaf-tissue yellowish-hirsute, especially 
below, the hairs partially deciduous with age, the costules bearing a few small deciduous 
fibrillose or laciniate ferruginous scales below ; veins 9 or 10 pairs, once-forked below the 
middle ; sori inframedial, ascending two thirds or less the length of the segment; indusia 
very membranous, rupturing easily into irregular fragments; receptacles elevated, slender, 
somewhat capitate, hirsute. 
Type collected on Blue Mountain Peak, Jamaica, altitude about 2100 meters, April 21, 1903, 
Underwood 2502 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Known only from the upper slopes and summit of Blue Mountain Peak, 
Jamaica; several collectors. 
31. Cyathea Maxoni Underwood, sp. nov. 
Caudex erect, 4-5 meters high, unarmed, with distant depressed broadly ovate stipe- 
scars 2.5-3 cm. long (these with protruding fibrovascular bundles), at the top decorated with 
copious dark-brown shining deltoid-lanceolate long-attenuate scales up to 2 cm. long; 
fronds ample, spreading; stipe 2 em. or more in diameter at the base, here densely clothed 
on the inner side like the caudex, dark, above pale-brownish, sparingly muricate, with a 
few dark ovate long-attenuate deciduous scales, minutely brownish-furfuraceous; pinnae 
subsessile, 45-50 cm. long, 15-16 cm. broad, alternate, overlapping at the base, narrowly 
oblong-lanceolate, abruptly acuminate, dark-green above, glaucous below; primary and 
secondary rachises pale reddish- or yellowish-brown, minutely furfuraceous, quickly glabrate; 
pinnules distant, about 25 pairs, spreading, deltoid-lanceolate, 7-8 cm. long, about 1.75 cm. 
broad at the base, cut about four fifths the distance to the costa, tapering in the outer part 
rather abruptly to a crenulate caudate apex (1.5-2 cm. long), the costa very minutely 
puberulent on both surfaces with greatly reduced moniliform hairs; segments about 16 
pairs, rigidly coriaceous, oblong, slightly falcate, close, separated by a very narrow acute 
sinus formed by the reflexed crenulate margins ; costules with afew minute reddish-brown 
bullate scales, also slightly puberulent with minute stiffish hairs ; veins about 10 pairs, con- 
cealed, mostly once-forked near the base, slightly puberulent below and towards the apex 
above, the hairs stiffish, short and readily abraded; sori small, about 8 pairs, inframedial, 
forming a compact row next the costule; indusium globose, pale-brownish, very mem- 
branous, rupturing irregularly ; receptacle short, globose, hirsute. 
Type collected on mountains 5 miles south of Cartago, Costa Rica, altitude about 1800 meters, 
in a humid forest opening, May 12, 1906, Maxon 524 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION : Known only from this collection. 
32. Cyathea onusta Christ, Bull. Herb. Boiss. II. 4: 950. 1904, 
Cyathea membranulosa Christ, Bull. Herb. Boiss. II. 7: 271. 1907. 
Caudex erect, 2-3 meters high, very stout, the summit somewhat scaly and rough with 
the spiny stipe-bases of previous seasons, without definite scars ; fronds ample, tripinnatifid, 
spreading; stipe very stout, 50-60 cm. long, deeply and irregularly canaliculate, dark- 
brownish, dull crispate-furfuraceous, thickly armed with stout conical spines 4-8 mm. long 
(borne singly or in pairs), tuberculate with age, densely paleaceous on the inner side, the 
scales 2-3 cm. long, lanceolate, attenuate-subulate, dark lustrous brown with lighter 
margins ; rachis stout, light yellowish-brown to brownish-castaneous, glabrescent, minutely 
papillose, muricate or slightly spiny toward the base; pinnae dark-green above, blackish 
upon drying, bright clear green below, mostly subopposite, strictly sessile, 55-70 cm. long, 
15-20 cm. broad, ovate-oblong, not narrowed at the base, rather short-acuminate, the sec- 
ondary rachis light-brownish, sulcate, minutely apiculate-papillose, below minutely pu- 
berulo-furfuraceous, glabrescent, above brownish-pilose ; pinnules 25-28 pairs, approximate 
or mostly imbricate, narrowly oblong-lanceolate, acuminate, 9-12 cm. long, up to 2.5 cm. 
broad at the base, cut nearly to the costa (in the fertile pinnules rather more deeply), the 
