18 POLYPODIACFJE OF THE PHILIPPINE ISLANDS. 



Luzon, Steere; Benguet and Arayat, Loher; Camarines, Baranda. 

 Africa to Japan and Polynesia. 



(7) P. conifolium (Wall.) Presl. Rhizome erect; stipes clustered, 

 20 to 50 cm. high, clothed at the base with narrow black scales, stramineous ; 

 frond 30 to 50 cm. high, deltoid; pinnae deltoid, the lowest 10 to 15 cm. 

 long, with its lowest basipetal pinnule largest, usually falcate, 6 to 8 cm. 

 long, its pinnules of the second order stalked and toothed or lobed, spinulose, 

 subcoriaceous, glabrous; sori mostly in rows along the midribs. 



Luzon, Cuming 262; Benguet, Loher, Topping 192; Arayat, Merrill 3815; 

 Mount Mariveles, Copeland, Barnes 136, 142; Whitford 136. 

 Africa to Polynesia. 



(8) P. horizontale Presl., in Epim. Bot., p. 57. Stipes clothed with 

 short, ovate, and long, linear acuminate scales; frond about 1 m. high, 

 ovate, tripinriate; pinnae subopposite, short stalked, linear, very acute, 

 the lower ones horizontal; primary pinnules subsessile, oblong-lanceolate, 

 acute; secondary pinnules sessile, rhomboidal, obtuse, mucronate-dentate, 

 coriaceous, the veins beneath bearing scattered, minute scales; sori rather 

 large, with coriaceous, persistent indusium. 



Luzon, Cuming. 



(9) P. varium (L.) Presl. Rhizome short, creeping; stipe 30 to 60 

 cm. high, densely fibrillose toward the base; frond 30 to 50 cm. high, 

 about 30 cm. broad; lower pinnae the largest, 15 cm. long, subdeltoid, 

 with the lowest basipetal pinnules elongate, 8 cm. long, and divided into 

 distinct, linear-oblong, falcate secondary pinnules; the rest of the frond 

 only bipinnate, teeth rather obscure, not spinulose; coriaceous, glabrous, 

 but rachis and midribs fibrillose; sori medial; indusia reniform or peltate. 



Baguio, Elmer 6,489; Arayat, Loher. 

 Japan and China. 



(10) P. falcatum (L.) Diels. Stipes tufted, 15 to 30 cm. high, beset 

 at the base with large, dark scales; frond 30 to 60 cm. high, ovate- 

 lanceolate, simply pinnate; pinnae numerous, the lower ones stalked, ovate- 

 acuminate, falcate, 10 to 15 cm. long, 2 to 5 cm. broad, entire or slightly 

 undulate, contracted suddenly on the upper side and often auricled; 

 rounded or obliquely truncate on the lower, coriaceous, glabrous, glossy 

 above; veins as a rule anastomosing toward the margin; sori small, 

 copious, scattered. 



Mount Data, 2,250 m., Loher. 

 Natal across India to Hawaii. 



(4) NEPHRODIUM Richard. 



Fertile and sterile fronds or parts of the frond not differentiated, or 

 but slightly so; veins free, or the branches of adjacent veins anas- 

 tomosing to form regular areolae, triangular next the costa, trapezoidal 

 farther out ; sori round, the indusim cordate-reniform or wanting. Mostly 

 terrestrial ferns, of medium or large size, thin or moderately firm, but 

 not very coriaceous, compound. Related through Pleocnemia to Aspidium. 

 A very large genus, so natural that even the separation of the two great 



