me: 4: 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. siliculosum (Desv.) C. Chr. (O. awratum Kaulf.). 
Rootstock rather stout, covered with lanceolate, brown, spreading scales. 
Stipes glabrous, pale, sometimes brownish, 10 to 30 cm long. 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 leafiets usually. inequilateral, dimi- 
diate to cuneate-flabellate or trapezoidal, the outer edge variously toothed 
or lobed, continuous or jointed 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. philippense 
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 em long, 1.5 to 
3.5 em 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. 
