YII. POLYPODIE.^^:. 



stipes articulate to the rhizome; indusiuni wanting. The fronds are 

 simple or variously cut, the pinnte as a rule equilateral ; veins free or 

 variously anastomosing; sori terminal or dorsal on them, usually of definite 

 form and size, superficial or less often sunken. 



1. Sori linear, parallel to the midrib, sometimes spreading over 

 the parenchyma (Taenitidce) . 



2. Sori on sharply differentiated apex of frond (49) Hymenolepis 



2. Sori not confined to a specialized apex. 



3. Fronds pinnate, stipes not articulate to rhizome.... (50) Taenitis 



3. Fertile fronds trident-shaped (51) Christopteris 



3. Fronds entire (52) Drymoglossum 



1. Sori usually round, sometimes elongate but not along costa. 



2. Fronds with stellate pubescence, fronds simple (53) Niphobohis 



2. Fronds naked, or pubescence not stellate. 

 3. No distinct brown basal fronds. 



4. Sori definite, not spreading over paren- 

 chyma. 



5. Sori dorsal (54) Polypodium 



5. Sori in reflexed outgrowths of margin.. (55) Lecanopteris 

 4. Sori spreading over parenchyma, confined 

 to apical segments of frond. 



5. Frond pinnate (56) Photinopteris 



5. Frond pinnatifid . (57) Dryostachyiim 



3. Dimorphous, basal fronds brown and rigid (58) Drynaria 



(49) HYMENOLEPIS Kaulfuss. 



Rhizome stout, creeping, scaly; fronds simple, entire or repand, con- 

 tracted to a sharply differentiated fertile apex; no distinct sori in the 

 fertile region; veins anastomosing, with free included veinlets. Small or 

 moderate sized ferns. 



(1) H. spicata (L. f.) Presl. (Including E. revohifa Bl. and H. ophio- 

 glossoides VA.). Kliizome creeping, scaly; stipe 2 to 4 cm. high, glabrous, 

 stramineous or the base ebeneous; sterile part of frond 15 to 40 cm. high, 

 one-tenth as broad, entire, attenuate to both ends, or more abruptly con- 

 tracted above, glabrous, herbaceous or coriaceous, flat or carinate; fertile 

 part narrowly linear, o to 2.3 cm. long, decurved. Epiphytic. 



Luzon, Meijen, Cuming 02; Benguet, holier, Barnes Forestry Bureau 961; 

 Mount Arayat, Loher, Merrill: Moimt :\Iariveles. Copeland 213; Mount 

 Apo, Copeland 1001 (very small), 102G. 



Madagascar to southern China and Pol%'nesia. 



(2) H. platyrhynchos (J. Sm.) Kunze. ( Macropletlms Presl.) Rhi- 

 zome very short, scaly; fronds clustered, attenuate to almost sessile bases, 



110 



