POLYPODIACEAE 55 



Common in thickets; widely distributed in the Philippines. Tropical 

 Africa and Asia to Polynesia. 



2. A. philippense L. {A. lunulatum Burm.). Culantrillo (Sp.-Fil.). 



Stipes slender, dark-brown, shining, glabrous, tufted, 5 to 20 cm long. 

 Fronds simply pinnate, 10 to 30 cm long, 5 to 8 cm wide; leaflets slenderly 

 stalked, thin, dimidiate, oblong to semilunate in outline, 1 to 3.5 cm long, 

 0.8 to 1.5 cm broad, the lower margin nearly straight or forming an angle 

 at the insertion of the stalk, the upper margin semicircular, entire or 

 slightly lobed. Sori oblong to linear, as long as the lobes are broad. I 



Common on wet or damp cliflfs and banks in the rainy season, in thickets, 

 etc.; throughout the Philippines. Tropics generally. 



*3. A. MACROPHYLLUM Sw. 



stipes black, shining, naked, 15 to 30 cm long. Fronds simply pinnate, 

 20 to 35 cm long, 10 to 20 cm wide, with about 6 pairs of opposite, lateral, 

 sessile or subsessile pinnae (leaflets) below the terminal one; lower pinnae 

 of sterile fronds 7 to 10 cm long, about 5 cm wide, their bases subhastate, 

 inequilateral, the fertile ones somewhat smaller than the sterile, somewhat 

 falcate, acuminate, the sori linear, continuous or somewhat interrupted, 

 along the margins: 



Cultivated for ornamental purposes, not spontaneous. A native of 

 tropical America, introduced here and in other tropical countries. 



* A. TENEEUM Sw. Alambre (Sp.-Fil.) ; Maiden Hair Fern.' 



Stipe? stiff, 20 to 30 cm high, naked, black or nearly so, shining. Fronds 

 25 to 70 .cm long, deltoid, 3- or 4- pinnate. Leaflets flabellate-cuneate, thin, 

 1 to 2 cm long, jointed on their pedicels, the base cuneate, the pedicel 

 attached at about the middle of the base, the upper and outer edge some- 

 what rounded, slightly or rather deeply lobed, the veins forked, slender. 

 Sori in rounded to transversely oblong patches in shallow hollows terminat- 

 ing the lobes. 



Commonly cultivated but not spontaneous. A native of tropical America, 

 introduced here and in other tropical countries. 



♦5. A. TRAPEZIFOEME L. 



A stout, coarse fern, the stipes black, shining, 15 to 50 cm high, naked.- 

 Fronds 2- or 3-pinnate with a terminal branch 10 to 20 chi long and 2 to 4 

 large ones on each side, the lowest of which are often branched again. 

 Leaflets subcoriaceous, 4 to 6 cm long, 2 to 3 cm wide, the base nearly 

 a right-angle, the pedicel attached at the angle, obliquely ovate to trape- 

 zoidal in outline, the apex subacute, the upper and outer margins slightly 

 lobed. Sori transversely oblong, terminating the lobes. 



Cultivated for ornamental purposes, not spontaneous; much the largest 

 species of the genus in the Philippines. A native of tropical America, 

 introduced here and in other tropical countries. 



12. PTERIS Linnaeus 



Terrestrial ferns, usually tufted, the stipes not jointed to the creeping 

 or erect rootstock. Fronds various, at least pinnate, the lowest pinnae 

 often most developed, especially on the lower side. Veins free or forming 

 areolae along the costa. Sorus on a subinarginal strand connecting the 

 ends of the veins, protected by the modified and reflexed continuous margin 

 of the frond; without an extrorse indusium. (Greek name for a fern.) 



