130 POLYPODIACE^ OF THE PHILIPPINE ISLAM, S. 



(58) P. nigrescens Blume. Rhizome short, very thick, the ovate scales 

 usually concealed by roots; stipe 10 to 50 cm. high, firm, glabrous, straight; 

 frond rarely simple or ternate, usually pinnatifid to about 7 mm. from the 

 rachis into few or many broadly linear segments, which are acuminate, 

 entire or repand, 20 to .30 cm. long, 2 cm. or more broad, herbaceous, 

 glabrous, dark green; main veins fine, indirect, falling short of margin, 

 included free veinlets copious; sori round, deeply immersed, in single rows 

 nearer the midrib than the margin. 



Benguet, Topping 339; Movmt Mariveles, Copeland 1404; Rizal and 

 Laguna. Loher ; Tayabas, Warburg 12756; vSorsogon, Albay, and Camarines, 

 Barcnida ; Davao, CopeUind 090, 9G4. 



India across Polynesia. 



(59) P. longissimum Blume. Rhizome very stout, clothed with large, 

 ovate, deciduous scales; stipe stout, 30 to 60 cm. high, polished, stra- 

 mineous; frond 40 to 100 cm. high, 25 to 35 cm. broad, pinnatifid to the 

 narrowly winged rachis into linear erecto-patent, acuminate, entire or 

 repand segments usually not more than 1 cm. broad, subcoriaceus, glabrous; 

 venation inconspicuous; sori deeply immersed, round, in single rows rather 

 nearer the midrib than the margin. 



Rizal, Merrill I35C, 2267; south Luzon, Baranda; Basilan, DeTore and 

 Hoover 24 ( ?). 



India to Java and Formosa. 



(60) P. palmatum Blume. Rhizome creeping, densely clothed with 

 large, spreading, lanceolate-subulate ferruginous paleae; stipe 15 to 30 

 cm. high, firm, glabrous; frond 15 to 35 cm. high, 15 to 30 cm. broad, 

 pinnatifid very nearly to the rachis or pinnate; pinnae 10 to 15 cm. long, 

 1 cm. more or less broad, broadest in the middle, acvmiinate, entire or 

 subcrenate, cuneate-decurrent at the base, coriaceous, glabrous; main veins 

 conspicuous, veinlets obscure; sori round, in slight depressions, in single 

 rows, one sorus between each two main veins. 



Luzon, Cuming, Steere; Benguet, Arayat, and Mount Mariveles, Loher; 

 Benguet, Topping 189, 292; Mount Mariveles, Merrill 3235, Copeland; 

 Davao, Warburg 14154, DeVore and Hoover 328, Copeland 1062; Jolo 

 Archipelago, Burbidge. 



Malaya. 



(61) P. angustatum Blume. Rhizome stout, creeping, clothed with 

 very large, ovate-lanceolate palese, brown with scarious margins; stipe 30 

 cm. high, firm, erect, glabrous; frond 35 to 45 cm. high, pinnate; pinnse 

 15 to 20 cm. long, 2 to 3 cm. broad erecto-patent, acuminate obscurely 

 serrate, the lower ones sessile, the upper broadly adnate to the rachis, 

 coriaceous, glabrous; main veins conspicuous, veinlets obscure; sori large, 

 round, superficial, in single rows, one sorus between each two main veins. 



Mount Apo, DeVore and Hoover 330, 341, 376, Copeland. 



Java and Celebes. 



This species is imited with P. palmatum in Synopsis Filicum and by 

 Christ; Init the two Philippine species, each agreeing perfectly with the 

 figure and description of Blume, differ in the .size and position of the sori, 



