204 22. DrYOPTEWs. § 1. lastraea. 



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

 fugacious. 

 Borneo. 



(62) D. su barb urea, C. Chr., Ind. Fil. ; Aspidium megaphijllum, 

 Chrisi, Bull. Herb. Boiss., VI, 194; A. Filix-Mas, Sic, var. megaphylluin, 

 Christ, Ann. Btz., XV, 127; Polypodimn subarboreiim, Bk., Journ. ofLinn. Soc, 

 Bot., XXIV, 239; JSephrodium megaphylluin, Bk., 1. c, XXII, 227; — var. 

 Warburgii, Christ, in Warb., Mons., I, 81 ; Alsophila Warburgii, Christ, Ann. 

 Biz , XV, 80, tab. XIll, fig. 5, a— e. 



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

 scales like the rachis. Fronds large, deltoid, 4-piuiiate. Pinnae 45 — 75 c.M. 

 long, + 15 c.M. broad, stalked, acuminate, oblong-lanceolate. Pinuulae ovate- 

 o^long, remote, sessile, alternate. Tertiary divisions oblong, ± sessile, 2 — 3 

 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. 



Var. If'arburgii : 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 with reddish-brown, ovate scales like the veins beneath. 



Malaya; — var. W^arburgii: Batjan, Celebes. 



% 2. NEPHRODIUM. 



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

 ones. (65) D. Bakeri. 



1.1. Fronds pinnate or 2-pinnalipd; the terminal pinna not or hardly exceeding 

 the largest lateral ones. 

 S. Rhizome wide-creeping ('). 



3. Lower jtinnae slightly, if at all, reduced; the' fronds occasionally 

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

 A. Texture ± herbaceous. 



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



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

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



