POLYPODIACEAE 49 



or nearly so, or 2-valved and marginal, attached at the inner side, opening 

 outward. (Greek. "kidney" and "scale," allusion to the shape of the in- 

 dusium.) 



Species about 17, in all tropical countries, about 7 in the Philippines. 



1. Fronds very narrow, 1 to 2 cm wide, the pinnae of two oblong to orbicular, 



imbricated leaflets; cultivated only 1. iV. duffli 



1. Fronds 2.5 to 5 cm wide; pinnae oblong, prominently auricled at the base. 



2. N. cordifolia 



1. Fronds 8 cm wide or more; pinnae oblong to linear-lanceolate, elongated. 

 2. Pinnae deeply pinnately lobed, the lobes narrow, close, variable in 



length; fronds prominently brown-ciliate; cultivated only. 



3. N. floccigera, var. moristruosa 

 2. Pinnae entire, or only slightly crenate or toothed. 

 3. Fronds nearly glabrous, elongated, often exceeding 2 m in length, 

 the pinnae usually not auricled; sori distant from the margins. 



4. N. biserrata 

 3. Fronds more or less brown-ciliate; pinnae always auricled on the 

 upper side at the base; sori marginal or submarginal. 



6. N. hirautula 

 ♦1. N. DUFPii Moore.' 



Tufted, froin stout rootstocks, the rachis and stipes chaffy with brownish 

 scales and hairs, the rachis 8 to 15 cm long. Fronds narrow, linear, 

 elongated, 20 to 35 cm long, -1 to 2 cm wide, narrowed toward the base, 

 the apex often forked. Pinnae numerous, the lower ones reduced and 

 distant,, the central ones close, each consisting of 2, oblong to orbicular, 

 imbricated leaflets which are joined at the base, their margins entire or 

 crenate, usually less than 1 cm long. 



Cultivated, not spontaneous; introduced. A native of Malaya and 

 northern Australia. 



2. N. cordiforia (L.) Presl. 



Fronds tufted, erect, from a short, suberect rootstock, the wiry fibrous 

 roots often bearing tubers. Stipes 3 to 15 cm long, glabrous or more 

 usually clothed with slender, soft, brown paleae. Fronds 15 to 50 cm 

 long, 2.5 to 5 cm wide, lanceolate, narrowed at both ends, the pinnae 

 numerous, close, sessile, often imbricate, toothed to subentire, oblong, $ 

 to 8 mm wide, inequilateral, the base cordate, or rounded on the lower 

 side and auricled on the upper side. Sori large, in a row midway, between 

 the midrib and the margin; indusium broad, opening toward the apices 

 of the pinnae. 



Not uncommon in cultivation in Manila; widely distributed in the Phil- 

 ippines at medium and higher altitudes. Tropics generally. 



*3. N. FLOCCiGEBA (Blume) Moore, var. monstruosa Hort. 



Tufted, the stipes furfuraceous, the rachis and pinnae furfuraceous 

 and more or less densely villous with weak, spreading or somewhat matted, 

 rather soft, brown hairs. Fronds oblong, 50 to 90 cm in length.' Pinnae 

 numerous, lanceolate to oblong-lanceolate, 1 to 2.5 cm wide, deeply and 

 irregularly divided into numerous, unequal, close, often imbricate, linear 



' Species indicated by light faced type are introduced, and those marked 

 with an asterisk are cultivated only. 



1116SS i 



