116 POLYPODIACE^E OF THE PHILIPPINE ISLANDS. 



1. Veins anastomosing irregularly, with free included veinlets in 

 various directions. 

 2. Base of frond like the upper part. 



3. Rhizome not inflated nor inhabited by ants. 



4. Sori not confluent nor in single rows between 



veins Phymatodes 



4. Sori in single rows between main veins and 



often confluent Selliguea 



3. Rhizome inflated and inhabited by ants Myrmccophila 



2. Base of frond brown and rigid Drynariopsis 



EUPOLYPODIUM. 



1. Fronds simple and entire. 



2. Fronds hirsute, with red or brown hairs. 



3. Hairs in stellate clusters (1) P. ja.goria.num 



3. Hairs solitary as a rule. 



4. Fronds 3 mm. or less broad. 



5. Hairs long and flexile (2) P. Christi 



5. Hairs short and stiff (3) P. Merrillii 



4. Fronds larger. 



5. Veins trifld, stipe long (4) P. setigerum 



5. Veins once forked. 



6. Fronds obtuse (5) P. hirtellum 



6. Fronds narrow, acute (6) P. setosum 



2. Fronds glabrous. 



3. Fronds stipitate. 



4. Sori immersed (7) P. caespitosum 



4. Sori superficial (8) P. fasciatum 



3. Fronds sessile (9) P. sessilifolium 



1. Fronds crenate or shallowly lobed. 



2. Sori scattered (10) P. pleiosoroides 



2. Sori in regular rows parallel to costa (11) P. lohenanum 



1. Fronds pinnatifid very nearly to the rachis. 

 2. Sorus one on each segment. 



3. Segments less than their own width apart.... (12) P. cucullatum 

 3. Several times their width between segments.. (13) P. gracillimum 



2. Sori several on each segment (14) P. solidum 



1. Fronds pinnate. 



2. Veinlets simple. 



3. Sori superficial. 



4. Pinna? entire (15) P. inconspicuum 



4. Pinnae slightly crenate. 



5. Lamina hirsute (16) P. minutum 



5. Lamina glabrous (17) P. macrum 



4. Pinnae sharply toothed (18) P. subfalcatum 



3. Sori immersed. 



4. Sori parallel to costa (19) P. celebicum 



4. Sori oblique to costa. 



5. Young sorus almost inclosed. 



6. Frond lax, 25 cm. or more 



long (20) P. obliquatum 



6. Frond firm, usually 



smaller (21) P. decorum 



5. Rim of cavity not covering sorus. 



6. Rim of cavity elevated (22) P. craterisorum 



6. Rim of cavity plane (23) P. subobliquatum 



2. Veinlets forked. 



3. Sori immersed (24) P. papillosum 



3. Sori superficial (25) P. Leysii 



