76 POLYPODIACE^E OF THE PHILIPPINE ISLANDS. 



(17) D. deltoideum (Presl) Christ. Caudex erect, clothed with black 

 paleee, and bearing stout roots; stipes about 20 cm. high, black and black- 

 scaly at the base, glabrous and greenish above; frond 30 to 40 cm. high, two- 

 thirds as wide, deltoid, with a few distant pinnae; the lowest pinnae about 

 12 cm. long, 5 cm. broad, bearing numerous subsessile pinnules; pinnules 

 obtuse, lanceolate, cut two-thirds of the way to the costa into blunt lobes, 

 glabrous, herbaceous; veins pinnate- forked in the lower lobes; sori rich- 

 brown, reaching the margin. 



Luzon, Cuming 29; Davao, Warburg 14126, Copeland 966, the Davao 

 plant differing from the type in having narrower pinnae and their rachis 

 green. 



Celebes. 



(18) D. meyenianum Presl Epim. Bot., p. 86. Frond probably about 

 1 m. high, ovate-triangular, bipinnate; pinnae 40 cm. long, alternate, 

 stalked, oblong-lanceolate, acuminate; pinnules subsessile, linear-oblong, 

 acuminate, pinnatifid three-fourths of way to costa into subopposite ovate- 

 oblong subfalcate obtuse serrulate segments, glabrous, thin-coriaceous; 

 veins pinnate-forked; rachis brown, channeled above; sori copious, reaching 

 from the midrib nearly to the edge. 



"Manila," Meyen, Arayat, 800 m., Loher. Christ distinguishes this from 

 D. polypodioides by its thinner texture, broader, less serrate segments, 

 and sori less lined up. A plant from San Ramon, Zamboanga, Copeland 

 734, agrees with Presl's diagnosis, but the 'sori are sparse and remote 

 from the costa. 



(19) D. polypodioides Blume. Caudex erect, subarborescent, densely 

 clothed at the top with long, dark brown, fibrillose scales; stipes densely 

 tufted, erect or spreading, ebeneous at the base, green above, stiff, muricate, 

 50 to 100 cm. high; frond 1 m. or more high, rather over half as wide, 

 bipinnate; pinnae alternate, the lower ones in large fronds reaching a 

 length of 60 cm. and a breadth of 18 cm., bearing many alternate pinnules; 

 pinnules stalked, acuminate, cut down almost to their costa into numerous 

 linear-oblong obtuse more or less serrate segments, herbaceous or sub- 

 coriaceous; veins pinnate in the segments, veinlets numerous, simple; sori 

 in regular rows, usually falling considerably short of the margin. 



Southern Luzon, Baranda; Isabela Province, Warburg 11618, 11623; 

 Tarlac, Hall; Caraballo Sur, Merrill 233; Bataan Province, Barnes 132, 

 Copeland 235, Whitford 194. 



India and Malaya. 



Forms corresponding to Blume's D. asperum, with rather coriaceous fronds 

 are common, but not separable even as a variety. 



(20) D. ebenum J. Sm. differs from D. polypodioides in having a slender 

 naked ebeneus rachis, and erecto-patent lobes, with but 4 distinct veinlets 

 in each. 



Philippines, Cuming 159. 



(30) ASPLENIUM Linnaeus. 



Sori simple, usually confined to the acropetal side of the veins; indusium 

 the shape of the sorus, and continuous across the vein in the few species 



