38 POLYPODIACE.^ OF THE PHILiri'INE ISLANDS. 



(17) A. irriguum J. Sm., Prcsl. Stipes tufted, 10 to 15 cm. liigh, 

 grayish, finely villose; frond 15 to 25 cm. high, 10 to 15 cm. broad, 

 subdeltoid, with a large oblong, terminal pinna with a pair of deep 

 lanceolate lobes at the base, and below this 1 to 2 pairs of slightly 

 sinuate lateral pinnae, tlie lowest forked at the base, papyraceo-herbaceous ; 

 main veins flexuose; areolae fine, with free included veinlets; sori small, 

 scattered, often confluent; indusium small, fugacious. 



Luzon, Chiming 31; Rizal, Loher. 



(18) A. Menyanthidis Presl. Rhizome creeping; stipe 15 to 30 cm. 

 high, brownish, naked; frond 30 to 60 cm. high, 30 cm. or more broad, with 

 an acuminate, oblong-lanceolate, sinuate terminal pinna 15 to 30 em. 

 long, 2 to 4 cm. broad, and 2 to 4 similar ones on each side, the lowest 

 stalked, sometimes forked, subcoriaceous ; main veins, close, conspicuous, 

 reaching the margin; areolae fine, with copious free veinlets; sori small, 

 scattered, all on the connected veinlets. 



Sorsogon, Haenke; southern Camarines, Cuming 183 in part; Sorsogon, 

 Baranda. 



New Guinea, Solomon Islands. 



(19) A. repandum Willd. Stipe 30 to 60 cm. high, grayish brown, 

 naked; frond 60 cm. or more high, 30 to 45 cm. broad, the apex deeply 

 pinnatifid, with linear-oblong, slightly sinuate lobes; below this 4 to 8 

 pinnae on each side, 15 to 20 cm. long, about 3 cm. broad, acuminate, 

 narrowed to the base, sinuate, subcoriaceous, the lowest stalked and 

 forked; main veins distinct to the margin; areolae copious with free 

 veinlets; sori in distinct rows near the main veins; indusium orbicular, 

 peltate, I mm. broad. 



Luzon, Cuming 183 in part; Sorsogon and Catanduanes, Baranda. 



(20) A. calcareum Presl. Rhizome subcreeping; stipe 10 to 15 cm. 

 high, naked; frond 30 cm. or more high, ovate-lanceolate, with acuminate 

 pinnatifid apex, and below it 4 to 6 distant, stalked pinnae on each side, 

 the lowest deltoid, 15 cm. long, cut down to the rachis below into stalked 

 lanceolate-acuminate, deeply and obtusely lobed pinnules, subcoriaceous; 

 areolae not very abundant and mainly costular ; indusium orbicular. 



Leyte, Cuming 310. 



(21) A. membranaceum Hooker. Rhizome ascending, with a mass of 

 black paleae at the apex; stipes tufted, about 30 cm. high, nearly naked, 

 with a few spreading linear paleae below; frond about as high as the 

 stipe, deltoid, acuminate, membranous, puberulous especially beneath; 

 upper part subbipinnatifid, free pinnae 5 to 7, lowest much the largest, 

 subdeltoid, 10 to 20 cm. long, pinnules on the lower side much the larger, 

 pinatifid into obong, entire or crenate segments ; veins anastomosin:^ 

 principally in costal arches; sori copious, mostly marginal in the lobes. 



"Philippines," Cuming; Arayat, 800 m., Loher; Davao, Copeland 898. 

 China, Formosa, Java, Ceylon. 



(22) A. giganteum Blume. Stipe 30 to 60 cm. high, brown, glossy; 

 frond 30 to 60 cm. high, broadly deltoid, with pinnatifid apex and 4 to 5 

 pairs of pinnae of which the upper are decurrent, the lower stalked; 



