﻿204 22. DFYOPTERIS. § 1. LASTRAEA. 



lobes. Sori small, medial, 1 — 2 to a final segment; indusium membranaceous, 

 fugacious. 

 Borneo. 



(62) D. subarboi'ca, C Chr., Ind. Fil. ; Aspidium niegaphyllum, 

 Chrisl, Bull. Herb. Boiss., VI, 194; A. Filix-Mas, Sa\, var. megaphylluni, 

 Christ, Ann. Btz., XV, 127; Pohjpodmm suharhoreum, Bk., Journ. ofLinn. Soc, 

 Bot., XXIV, 259; Nephrodium megaphyllum, Bk., 1. c, XXII, 227; — var. 

 VVarburgii, Christ, in Warb , 3Ions., I, 81 ; Alsophila Warbnrgii, Christ, Ann. 

 Biz , XV, 80, tab. XIII, fig. 3, a— e. 



An enormous fern. Stipes rough, clothed wilh adpressed, subulate, brown 

 scales like the rachis. Fronds large, deltoid, 4-piniiate. Pinnae 4S — 7b c.M. 

 long, ± 15 c.M. broad, stalked, acuminate, oblong-lanceolate. Pinnulae ovate- 

 oblong, remote, sessile, alternate. Tertiary divisions oblong, + sessile, 2 — 5 

 c.M. long, the rachis narrowly winged. Ultimate segments + 4 m.M. long, 

 toothed. Texture herbaceous; surfaces furfuraceous. Sori single at the base 

 of the ultimate lobes; indusium membranaceous, fugacious. 



\av. l¥ai*burg;il : Scales of the stipe dark-reddish-brown, long- 

 acuminate from a broad base, the higher ones obliterate, mixed with rough, 

 short prickles. Stipes brown, rachis furfuraceous, polished ; secondary rachises 

 densely clothed wilh reddish-brown, ovate scales like the veins beneath. 



Malaya; — var. Warburgii: Batjan, Celebes. 



$ 2. NEPHRODIUM. 



1. Fronds simple or pinnate, the terminal pinna much exceeding the lateral 

 ones. (63) D. Bakeri. 



±.±. Fronds pinnate or 2-pinnatifid ; the terminal pinna not or hardly exceeding 

 the largest lateral ones. 

 2. Rhizome ivide-creeping ('). 



3, Lower pinnae slightly, if at all, reduced; the fronds occasionally 

 with a single pair of dwarfed or reduced pinnae at the base (^). 

 A. Texture +_ herbaceous. 



5. Pinnae entire, or cut less than ^j^-way down tho the costa. 



{') See also D. parasitica, 0. Ktze. 

 (') See also D. invfsa, 0. Ktze. 



