FERNS OF THE MALAY-ASIATIC REGION. 
49 
shining, chestnut, like the main rachis ; fronds of adult (arboreous) 
plants almost 2 m long, narrowly deltoid ; pinnae 40 cm long, stalks 2 to 3 
cm long, remote, acuminate, not reduced at the base, their rachises 
paleaceous beneath, with not very persistent, rather polymorphous, tawny 
scales up to 15 mm long, above hairy; pinnules remote, stalked, up to 7 
to 10 cm long, and 20 mm wide at the base, long-acuminate with serrate 
tips, cut to a narrow wing, or in most ample specimens the single lowest 
segments free and adnate, costae hairy above, beneath bearing copious, 
more or less persistent, pale-tawny, ovate scales 1.5 mm long; segments 
falcate, linear-oblong or oblong, usually obtuse, serrulate, thinly her- 
baceous, glabrous except on the costule beneath, where the scales are 
smaller, darker, and more bullate than on the costae ; veinlets 6 to 9 on a 
side mostly forked; sori inframedial or almost costular, hardly 1 mm 
wide ; indusium brown or purplish-brown, soon breaking into large, 
irregular, persistent fragments. 
Palawan (Paragua), alt. 600 to 1,300 m. 
64. Cyathea assimilis Hooker. 
Trunk 6 m high; stipe bright-chestnut, slightly muricate; rachises 
scaly above, costae so beneath; frond ample, coriaceous-membranaceous; 
pinnae 30 cm long, 10 to 13 cm broad, acuminate, stalked; pinnules cut 
almost to the rachis; segments 8 to 10 mm long, oblong, obtuse, sub- 
falcate, coarsely toothed; veinlets usually forked; sori medial; indusium 
complete, very thin, breaking irregularly. 
Borneo, alt. 600 m, Celebes. 
65. Cyathea negrosiana Christ in Philip. Journ. Sci. Bot. 2 (1907) 181. 
Trunk 2 to 4 m high ; stipe up to 40 cm long, almost black at the 
base and bearing a few linear-setaceous, brown palese 2 cm long, spiny; 
rachis brown, glabrous or nearly so, rough with sparse, sharp, fine 
prickles; frond over 1 m long, 50 cm wide; lowest pinnae reduced, sub- 
medial ones largest, more than 30 cm long, remote, sessile, rachises 
minutely rough, and scurfy or glabrescent beneath; pinnules sessile, 
remote, acuminate, 7 cm long, 15 mm wide, cut to a narrow wing and 
at the base to the costa, the secondary pinnules adnate, costae hairy above, 
clothed beneath with minute, pale, ovate scales, the costules bearing still 
smaller ones; segments 2.5 mm wide, 7 mm long, subfalcate or straight, 
subacute, obscurely crenulate, herbaceous, glabrous, dark-green above, pale 
beneath; veinlets 8 to 12 on a side, mostly forked near the base; sori 
costular, small, indusium transient except for basal fragments. 
Negros (Mount Silay, alt. 1,000 m to summit). 
66. Cyathea christii Copel. in Philip. Journ. Sci. 1 Suppl. (1906) 144. 
Trunk 3 to 4 m high, 7 cm thick, its apex and the bases of the stipes 
clothed with dense, harsh, setaceous, dirty-brown scales 15 mm long; 
stipes bearing a fine deciduous scurf, and sparse prickles 1 to 2 mm long; 
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