30 
29 - Sori on a continuous marginal vein 
t *1. 
29 - Sori on unconnected ends of* or on non-continuous marginal vein ..**••*•**•• 31 
30 - Xndusium single ....... Eteris 
30; - Indusiurn double .*•..««••• .. •« .•.. rteridium 
31 - Fertile leaves with whole margins inrolled.....34 
31 - Fertile leaves with only lobes inrolled, simulating Indusia..... 32 
32.- Leafstalks black, shining..... Adi an turn 
32 - Leafstalks brownish, dull • «......•. 33 
33 - Sori distinct, each in a depression between two lobes ............... Rypolepis 
33 - Sori crowded, not placed between lobes as above..... ? ter is • 
34 - Branch veins not connecting......* * • • Feiiaea 
34 - Branch veins connecting...♦ . Poryopteris 
35 - Indusiurn present.. .... *..... 
35 - Indusiurn absent «......36 
36 - Sporangia in definite sori ... ........... 38 
36 - Sporangia not in definite sori. ....... ...... 37 
37 - Fronds bearing yellow or white dust beneath • •••...• ••• Pi tyro gramma 
37 - Fronds not bearing yellow or white dust beneath Coniograrame 
38 - Fronds jointed to the rootstock (Polypodiaceae). ......... . 39 
38 - Fronds not jointed to the rootstock *................ ..42 
39 - Frond deltoid or pinnatifid... 40 
39 - Frond linear and entire (rarely dichotomous) ....... . Pleopeltis 
40 - Fronds decompound . ............ Polypodium 
40 - Fronds entire, pinnatifid, or lobed . ...............#.41 
41 - Areolae with simple included vein .. Phiebodium 
41 - Areolae with trichotomously branched included vein Microsorium 
42 - Fronds entire subentire, or pinnatifid. ..43 
42 - Fronds compound ....*.. 45 
