50 POLYPODIACEJE OF THE PHILIPPINE ISLANDS. 



1. Leucostegia ; indusium thin. 



2. Frond about 2 dm. high, triangular (8) H. falcinella 



2. Frond more than 3 dm. high. 



3. Sori 1 to 2 mm. wide (9) H. immersa 



3. Sori minute (10) H. hymenophylloides 



(1) H. angustata Wallich. Rhizome wide-creeping, scaly, stout; fronds 

 scattered, short-stalked, about 10 cm. long and 1 cm. broad, apex acute, 

 margin slightly and irregularly crenate, very coriaceous, glabrous or with 

 a few scales on the costa beneath; sori in a row along the edge. 



E-wi-ig River, Paragua, Merrill 778, on rocks in forest. 

 Malaya. 



(2) H. heterophylla (Desv.) J. Sm. Rhizome wide-creeping, scaly; 

 frond shortly stalked, 6 to 10 cm. long, one-fourth as broad, glabrous, 

 coriaceous; the sterile one ovate-lanceolate, entire or slightly lobed at the 

 base, the fertile one narrower, deeply sinuato-pinnatifid ; sori 2 to 10 

 to a lobe. 



Maquiling, Loher; Samar, Cuming 338; E-wi-ig River, Paragua, Merrill 

 763, epiphytic. 



Malaya and Polynesia. 



(3) H. gaimardiana (Gaud.) J. Smith. Rhizome wide-creeping, scaly; 

 stipe about 1 cm. high, scaly or glabrescent; frond 10 to 15 cm. high, 

 3 to 5 cm. broad, ovate-lanceolate, cut down nearly or quite to the rachis 

 into parallel, entire or crenate, linear-oblong lobes, the lowest pair of 

 which are often deeply incised on their lower side, glabrous, coriaceous; 

 sori oblique, in full rows between midrib and margin. 



Luzon, Cuming 61 ; Gimogon River, Negros, Copeland 54, in tree tops 

 in the forest. 



Malaya and Polynesia. 



Our plant is intermediate between Davattia parallela Wallich and D. 

 pectinata Smith. 



(4) H. repens (L.) J. Sm. (Davallia pedata Smith). Rhizome wide- 

 creeping, scaly; stipe 5 to 10 cm. high, rather scaly; frond 5 to 10 cm. 

 long, 3 to 5 cm. broad at the base, deltoid in general outline, cut down 

 nearly to the rachis; upper segments linear-oblong, acute, erecto-patent, 

 inciso-dentate, the lower pair broader, deeply inciso-pinnatifid, especially 

 on the lower side; texture coriaceous; sori placed in rows on the teeth 

 on both sides of the lobes. 



Arayat, Loher, Merrill 3818, differs from the type in that the sterile 

 frond is smaller and broadly lobed, and the fertile larger and more deeply 

 incised, and the rachis very scaly; Cagayan-Luzon, Warburg 12219; Mount 

 Mariveles, Merrill 3210, Forestry Bureau (Barnes) 347, Copeland. 



India to Japan and Australia. 



(5) H. vestita J. Sm. Rhizome wide-creeping, densely scaly; stipe 

 about 10 cm. high, rather scaly below; frond 10 to 20 cm. long, 10 cm. 

 broad, deltoid in outline ; all except the upper pinnae cut down to a narrowly 

 winged rachis; barren frond with the segments of all except the lower 

 pinnae blunt, scarcely toothed; lobes of the fertile pinnae narrower, sharper 

 toothed; of the lower ones deeply so; texture coriaceous; sori placed on the 

 teeth of the segments. 



