I'OLYPODIACEAE 47 



1. DRY0PTERI8 Adanson (Nephrodium Rich.) 



Rootstocks creeping or erect, the stipes scattered or clustered, not jointed 

 to the rootstock. Fronds elongated, simply pinnate or 2- to 4-pinnate, the 

 veins free, or the lower ones anastomosing and forming on each side of the 

 midribs of the 'pinnules a single row of regular deltoid areolae with an 

 excurrent veinlet springing from the apex, free or jointed in the angle of 

 the next upper anastomosing veins, often forming one or more rows of 

 rhomboid areolae between the costal ones and the margin. Pinnules mostly 

 equilateral, entire, toothed, or lobed, glabrous, puberulent, or ciliate. Sori 

 numerous, medial or submarginal, in regular rows on the veins. Indusium 

 usually reniform, attached by thie sinus, deciduous or persistent. (Greek 

 "oak" and "fern.") 



Species about 800 in all parts of the world, about 100 in the Philippines. 



'1. Fronds simply pinnate. 



2. Basal pinnae reduced to small, auricular appendages less than 1 cm 



long 1. D. basila/ris 



2. Basal pinnae not reduced, oj; only slightly so. 



3. Veins anastomosing, the ultimate lobes not extending more than 



one-half to the midrib 2. D. parasitica 



3. Veins free, the ultimate lobes extending nearly to the midrib. 



3. D. luerssenii 



1. Fronds more divided, bipinnate or tripinnatifid, at least the lower pinnae. 



2. Only the lower pinnae again pinnate, the upper part of the frond 



Simply pinnate; frond glabrous 4. D.dissecta 



2. AH 'the pinnae again pinnate; frond prominently white-ciliate on the 

 lower surface 5. D. setigerd 



1. p. batilaris (Presl) C. Chr. 



Rootstocks stout, suberect, the stipes tufted, 15 to 40 cm long, somewhat 

 Bulcate and angled, usually puberulent, the base clothed with long, filiform, 

 brown, spreading scales. Fronds 30 to 6&' cm long, 15 to 20 cm wide, 

 oblong, acuminate, simply pinnate, more or less puberulent, the base abrupt, 

 but with 8 to 16, distant, much-reduced, auricular, orbicular to ovate pinnae 

 less than 1 cm long along the stipe, the normal pinnae lanceolate to linear- 

 lanceolate, rather close, spreading-ascending, slendierly acuminate, alternate, 

 sessile or subsessile, 25 to 40 on each side, 7 to 10 mm wide, 10 to 14 cm 

 long, the base slightly inequilateral, subacute or somewhat truncate, the 

 margins coarsely toothed. Sori small, numerous, 8 to 5 in a row on each 

 side of the primary veins, the indusium persistant. 



Along small streams on ledges, San Juan del Morite; widely distributed in 

 the Philippines. Endemic. 



2. D. parasitica (L.) O. Ktze. 



Rootstock short, stout, erect, clothed with linear bfown scales on the 

 young parts, the stipes glabrous or puberulent, with few scattered scales 

 near the base, 10 to 50 cm tall. Fronds oblong, 20 to 50 cm long, simply 

 pinnate; pinnae 8 to 15 pairs, slenderly acuminate!, base truncate, the basal 

 ones not reduced, oblong to lanceolate, 4 to 10 cm long, pinnately lobed one- 

 third to one-half to the midrib into numerous, ovate to oblong, obtuse, falcate 

 lobes, glabrous or somewhat puberulent, the veinlets anastomosing near thi 



