1. CYATHEA. 33 



the rachises rough when they fall. Pinnae close, horizontal, to 50 cm. 

 long or longer, subabruptly acuminate. Pinnulae numerous, close, the 

 central ones the largest, horizontal, 7 — 8 ' cm. long and 2 cm. broad, 

 acuminate, cut do^vn nearly to the costa, pinnate at the base, the higher 

 rather ascending, the lower more or less abljreviated and deflexed. 

 Segments linear, straight or subfalcate, -. subhorizontal or more oblique, 

 3 mm. broad, blunt, crenate or crenate-dentate, the lower free, adnate, 

 somewhat narrowed near the base, the lowest more distinctly toothed, 

 rather rounded at the base. Texture rigidly coriaceous; surfaces naked; 

 costulae sparingly subbullate-squamulose beneath ; veins 8 — 10 on a side, the 

 higher simple, the following and the lower forked, the central twice forked 

 or sparingly pinnate. Sori occupying the lower veins, costular; mdusium 

 thin, breaking away irregularly. 

 Sumatra. 



(23c'/ C boi'iieensis, Copel., in Phihpp. Journ., VI"^, 135. 



Stipes fuscous, spiny, clothed at the base with narrow, rigid, black- 

 brown scales. Central pinnae sessile, nearly 60 cm. long, acuminate. 

 Pinnulae subsessile, 10 cm. long, 2 cm. broad, the larger ones acuminate, 

 the edge cut down to a narrow wing to the costa. Segments subfalcate, 

 3 — 4 mm. broad, obtuse, entire. Texture coriaceous; rachises minutely 

 tomentose above, the tomentum intermixed with scattered, deciduous, 

 linear scales, the main rachis asperous, the secondary ones pustulous; 

 costae velutinous above, very sparingly brown-scaly beneath ; costulae 

 naked above, sometimes scaly beneath ; veins 8 — 10 on a side, often forked. 

 Sori costular; indusium patelliform. 



Borneo. ■ 



f23d?) C. rigeiis, K«f., in Fed., Eep., XII, 163. 



Fronds 3-pinnatifld, the rachises brown, above densely castaneo- 

 tomentose, beneath appresso-squamulose. Pinnae sessile, close, 30 cm. or 

 more long, 8 cm. broad, bluntly acuminate. Pinnulae sessile, close, spreading," 

 4 cm. long by 1 '/j cm. broad, deeply pinnatifld. Segments oblong, subfalcate, 

 4-^,2 mm. long by 2—2 ' 2 mm. broad, subacute, crenate. Texture subcoriaceous ; 

 surfaces naked ; upper surface olivaceous, lower paler ; costae somewhat dark- 

 tomentose above, clothed beneath with crowded, acuminate, membranaceous," 

 pale or subferrugineous, subentire or slightly ciliated, plane-lanceolate and 

 subbuUate scales ; costulae naked above, white-woolly beneath ; veins 6 — 8- 

 Ferns and Fern Allies. 3 



