IDIUM. 35 



into pinnatifid, close, lanceolate pinnules, thin, glabrous; areolae copious, 

 without free veinlets; sori small, in rows near the main veins. 



Luzon, Cuming 9, 114. 



Malaya and Polynesia. 



(4) A. Brogniartii (Bory) Diels. Rhizome short, erect, densely scaly 

 at the top; stipe 30 cm. or more high, dark brown at the base, lighter 

 above and glabrous; frond 50 to 100 cm. high, half as broad, apex pin- 

 natifid into deep, repand or lobed segments; below this numerous distinct 

 pinnae, the lowest 15 to 20 cm. long, lanceolate-deltoid, lobed throughout 

 into broadly lanceolate lobes of which all except the lowest basipetal one 

 are entire or nearly so, subcoriaceous, glabrous; areolae copious, with 

 few or no free veinlets; sori rather small, quite confined to the margin. 



Rizal, Lohcr; Albay, Camarines and Masbate, Baranda; Negros, 

 Copeland. 

 Malaya. 



(5) A. lamaoense Copeland. Rhizome ascending; stipe 15 to 25 cm. 

 high, with a few small, lanceolate scales at the base, fibrillose near the 

 top, like the rachis; frond 15 to 25 cm. high, deltoid, usually trifoliate, 

 with a deeply tripartite apical segment, less often with the apical 

 segment entire, or with an extra pair of entire pinnae intercalated; lowest 

 pinnae short-stalked, about 10 cm. long, furcate with the smaller, lower 

 segment distant, herbaceous, glabrous, margin entire; areolae with free 

 veins; sori copious, irregularly scattered, round or elongate, exindusiate, 

 bright, deep red. 



On bowlders in creek bed, Lamao Forest Reserve, Luzon, Copeland 223. 

 This may not be distinct from A. irriguum. 



(6) A. difforme Blume. Stipes tufted, erect; 30 cm. or more high, 

 scaly near the base; frond 1 m., more or less, high, at least half as 

 broad; upper pinnae lanceolate, nearly entire or with broad obtuse or 

 falcate lobes reaching half way to. the costa; lower pinnae often deltoid, 

 with the lobes of the lower side prolonged and pinnatifid, subcoriaceous, 

 glabrous; areolae copious with few free veinlets; sori very copious, 

 scattered. 



Isabela-Luzon, Warburg 11589; Rizal and Laguna, Loher; Culion, 

 Merrill G65; Davao, Warburg 14132. 

 Malaya. 



(7) A. Whitfordi Copeland. Rhizome suberect, very short, densely 

 scaly at the apex; stipe 20 to 30 cm. high, dark brown at the base and 

 clothed with linear scales, lighter above and glabrous; frond 30 to 40 

 cm. high, deltoid, acuminate, papyraceous, glabrous, olive green, the white 

 veins conspicuous on the upper surface; apex pinnatifid, the segments 

 broadly crenate and obscurely serrate; below this about 6 free pinnae on 

 each side, erecto-patent, acuminate, lanceolate, pinnatifid more or less 

 than half way to the rachis into oblong, obtuse, entire or serrate lobes, 

 lower pinnae stalked; lowest ones deltoid, with one free basiscopic pinnule 

 resembling one of the upper pinnae; veins laxly anastomosing, without 

 free included veinlets; sori round or oblong, irregularly scattered but 

 wanting near the costa, exindusiate. 



Lamao Forest Reserve, near the river, Luzon, Whitford 201. 



