54 A FLORA OF MANILA 



10. ONYCHIUM Kaulfuss 



Rootstocks creeping, the stipes tufted, not jointed to the rootstock. 

 Fronds finely pinnately divided, the sterile and fertile segments more or 

 less dissimilar in shape and size, both slender, the veins free. Indusium 

 consisting of the reflexed, somewhat modified margin which reaches to 

 or nearly to the costa. (Greek "claw," reference to the shape of the lobes 

 in some species.) 



Species about 5, in the warmer parts of both hemispheres, 2 or 3 in the 

 Philippines. 



1. O. slliculosum (Desv.) C. Chr. (O. auratum Kaulf.). 



Rootstock rather stout, covered with lanceolate, brown, spreading scales. 

 Stipes glabrous, pale, sometimes brownish, 10 to 30 cm longf. Fronds 15 

 to 40 cm long, ovate, finely 3- or 4-pinnately divided, the ultimate segments 

 small and narrow, numerous, the sterile ones usually spatulate, and less 

 than 5 mm long, often toothed at the apex, the fertile ones pod-like, linear, 

 entire, acuminate, 5 to 20 mm long, about 1 mm wide, the indusium and 

 sori golden-yellow. 



On banks near Fort McKinley; widely distributed in the Philippines. 

 India to China, southward to Malaya. 



11. ADIANTUM Linnaeus 



Rootstocks creeping or erect, the stipes tufted, usually black and shin- 

 ing, naked, not jointed to the rootstock, erect, simply pinnate, to bi-, tri-, 

 or even quadripinnate, or forked, the leaflets usually inequilateral, dimi- 

 diate to cuneate-flabellate or trapezoidal, the outer edge variously toothed 

 or lobed, continuous or jpinted on their pedicels, the veins free, forked. ' Sori 

 rounded to oblong or linear, marginal, terminal on the veins, the indusium 

 consisting of the modified reflexed margin, bearing the sori on its surface. 

 (Greek "dry," from the fact that when plunged in water, the fronds 

 come out dry.) 



Species about 190 in both hemispheres, chiefly tropical, about 15 in the 

 Philippines. 



1. Fronds simply pinnate. 



2. Leaflets more or less villous or pilose, deeply incised 1. A. caudatum 



2. Leaflets glabrous or nearly so, not deeply incised. 



3. Leaflets dimidiate, the lower margin straight or forming an angle, 

 the upper one rounded, 1 to 3.5 cm long; sori not continuous. 



2. A. philippenae 

 3. Leaflets not 'dimidiate, 5 to 10 cm long, acute or acuminate, the 



sori continuous; cultivated only 3. A. macrophyllum 



1. Fronds 2- to 4-pinnate; cultivated only. 



2. Leaflets flabellate-cuneate, 1 to 2 cm long 4. A. tenerum 



2. Leaflets obliquely ovate to trapezoidal, 4 to 6 cm long. 



5. A. trapeziforme 

 1. A. caudatum L. 



Stipes tufted, 5 to 20 cm long, ascending, erect, or spreading, more or 

 less brown-villous. Fronds linear in outline, 15 to 30 cm. long, 1.5 to 

 3.5 cm wide, simply pinnate, the rachis often elongated and rooting at 

 its apex; leaflets spreading or ascending, dimidiate, oblong, sessile or 

 nearly so, the lower margin straight and entire, the upper one deeply 

 incised, villous. Sori nearly round, on the ends of the lobes. 



