rDi.Yi'oDiK.i: — I'oi.vroinrM. ] ] 7 



§ GoMOPlILEItlUM. 



1. Frond simple (2G) P. nummularium 



1. Frond pinnate. 



2. Lamina glabrous. 



3. Margin entire (27) P. verrucoaum 



3. Margin serrate (28) P. aubaurirulatuin 



2. Lamina hairy (29) P. mollivulum 



§ PlIYMATOOES. 



1. Fronds simple, not deeply lobed. 



2. Sort In a single row on each side of midrib. 



3. Fronds more or less dimorphous, small. 

 4. Main veins evident. 



5. Sorl not restricted to upper half (30) P. ner/lcctum 



5. Sorl restricted to upper half (31) P. rlu/nrhitpltijUuin 



4. Veins obscure. 



5. Fertile frond broad (32) P. acccdens 



5. Fertile frond linear (33) P. hammatisorum 



3. Fronds alike, minute (34) P. Rudimentum 



3. Fronds alike, larger. 



4. Sorl round (35) P. stowphi/Utim 



4. Sori oblong (36) P. lon<iifoHum 



2. Sorl in several rows or scattered. 

 3. Venation fine or obscure. 



4. Frond narrowly linear (37) P. tenuilore 



4. Frond linear-oblanceolate (38) P. punctatum 



4. Frond broadly oblauceolate (39) P. validum 



4. Frond ovate (40) P. oodes 



3. At least the main veins conspicuous. 



4. Main veins falling short of margin. 



5. Base attenuate (41) P. myriocai-pum 



5. Base rounded (42) P. Umjuacforme 



4. Main veins reaching margin. 



5. Sori in two rows between main 



veins (43) P. triquetrum 



5. Sori scattered. 



fi. Frond narrowed below. 



7. Lamina membra- 

 nous (44) P. viembranaceum 



7. Texture firmer. 



8. Sori numerous. 

 9. S o r i 



round.. (45) P. Zippclii 

 9. Sori ir- 

 regular (46) P. hctcrocarpum 

 8. Sorl few, large (47) P. hcmioiiitideum 



6. Base of frond broad (48) P. musav folium 



1. Shallowly lobed or plnnatifld (49) P. anomalum 



1. Deeply plnnatifld. (Fertile simple entire fronds rare.) 

 2. Sori small and scattered. 



3. Textile coriaceous (50) P. peutaphyllum 



3. Texture thin. 



4. Stipe naked, winged almost to base (51) P. insignc 



4. Stipe usually chaffy, less winged (52) P. pteropus 



2. Sorl large. 



3. Fronds dimorphous (53) P. inciirvatum 



