davallie.t: — XKi'iiurtLKPis. 47 



Benguet, Loher (altitude, 2,500 m.), Elmer 6507 (form with very chaffy 

 stipe and rachis), 6528 (very lax, serrate form, in moist ravines), 

 Topping 231; Nueva Ecija, Merrill 240; Arayat, 800 m., Loher; Mariveles 

 1,300 m., Merrill 3230. 



Pantropic. 



(2) N. exaltata Schott. Stipes tufted, 10 to 15 cm. high, naked or 

 slightly scaly ; fronds 30 cm. or more long, about 10 cm. broad ; pinnae 

 close but not imbricate, the fertile linear, acute, usually subfalcate, 

 sterile shorter and less acute, base rounded on the lower side, auriclod 

 on the upper, entire or nearly so, subcoriaceous, nearly glabrous; sori 

 submarginal ; indusium reniform with a deep sinus. 



Sorsogon, Baranda; Rizal, Loher, Marave. A form with repeatedly 

 dichotomous pinnules is common in cultivation in ^lanila. 

 Pantropic. 



(3) N. hirsutula Presl. Like A", exaltata, except that both surfaces 

 of the pinn;i^. and especially the rachis, are downy. 



Bataan Island, Baranda; Benguet and Alanila, Loher; cultivated in 

 Manila. 



(4) N. volubilis .7. Sin. Rhizome scandent indefinitely, naked, pale 

 brown, wiry, bearing small clusters of fronds at the ends of very short 

 branches; stipes about 10 cm. long, firm, naked or nearly so; fronds 

 25 to 50 cm. long, 4 to 6 cm. broad, the rachis firm, sparsely chaffy on 

 the back; pinnte about 5 mm. broad, very obtuse, nearly entire, rounded 

 on the lower side at the base, obscurely auricled on the upper, coriaceous, 

 glabrous, or the costa minutely squamulose above; sori near the margin; 

 indusium reniform with a deep sinus. 



Luzon, Cuming 37; Negros, Cuming 346; Davao, Copeland 429, common 

 sterile in low thickets. 

 Himalayas to New Guinea. 



(5) N. acuta Presl. Rhizome very short, erect, with scaly props; 

 stipes tufted, stout, 30 to 80 cm. high, squamulose at the base, glabrescont 

 above; fronds 80 to 120 cm. high, 30 to 40 cm. broad; pinna? 15 to 2r> 

 mm. broad, separated by less than their own breadth, acute, cuneate or 

 more abruptly contracted at the base, sterile entire, fertile obscurely 

 crenate, herbaceous or subcoriaceous, glabrous or nearly so; sori almost 

 as near the costa as the margin ; indusium becoming orbicular by the 

 meeting of the two broad basal lobes. (Includes N. macrophylla Presl.) 



Luzon, Cuming 22, Steere; Benguet, Loher (altitude, 2.250 m.), Elmer 

 6145; Manila, Warburg, Marave; Tayabas, Warburg; Sorsogon, Baranda; 

 Paragua, Merrill 725; Basilan, DeVore and Hoover 80; Davao, Warburg 

 12757, Copeland 365, 620. 



Pantropic. 



(0) N. rufescens Presl. Caudex erect, stout, with numerous braces, 

 coated with small black, appressed scales; stipes 20 to 60 cm. high, firm, 

 brown, glabrescent; frond 60 to 100 cm. high; pinnjp 10 to 15 mm. broad, 

 acute, sterile entire, fertile more or less serrate, broadly rounded at the 

 base on the lower side, the up]ier usually jironiineiitly auricled. ln'rbaci'ou.-5, 



