ANALYSIS OF THE GENERA. 
GENERA. 
Trise 1. Potypopiaces. 
Sori naked (without an indusium). 
Thece in elongate clusters ............... CETERACH, V. 4. 
Thece in circular clusters. 
Sori mixed with capillary segments... Woopsta, v. 4. 
Sori without capillary segments. 
Becoming confluent, and con- 
cealed by the revolute margin 
Ol THOHNONG voces pocuessicacescoees «cf AEBOSORUSs: Vin 4s 
Not becoming confluent or con- 
CORIEMC cdeenccccete es eras ccs covsves, LCORYVODLUMa Wy. An 
Sori covered by an indusium. 
Indusium marginal or submarginal- 
sori oblong or linear. 
PRPRMIATOUTGL,, ccc. .c+ ceccesscesesessceses -ETERIS, Vo 4. 
Sori at the apex of the segments of 
PNEMOMM rises ocldeteeotan vsee tens see seers) CADIANEUMS Valds 
Sori a continuous line on each side 
GMEHE IMIG-TIDseccsaeccesc steered sceceeec! UOMARTA va Ae 
Indusium not marginal. 
Sori circular. 
Indusium orbicular, or nearly so, 
attached by its centre only ... PoLysticuuM, v. 4. 
Indusium reniform .................. LASTREA, Vv. 4. 
Indusium inserted by a broad base, 
with the thece and containing 
them like a cup, its free margin 
PHONO sc ascaceecvoccesss sccacscsscenses GISTOPTH RIG: We As 
Sori elongate. 
Indusium single, opening towards 
ENC MIG) cee secosecyatecetenies se SREENTUMARNA 4s 
Indusium double, opening along 
the centre of the sori ............ SCOLOPENDRIUM, V. 4. 
TRIBE 2. GLEICHENIACE. 
Receptacle of Sori furnished within an 
exserted bristle ..........sssseseseeeeee LRICHOMANES, V. 4. 
Receptacle, of Sori not furnished with a 
bristle like appendage ............... HYMENOPHYLLUM, V. 4. 
TRIBE 3. OsMUNDACER. 
Thecze terminating the frond in spike- 
KG GlUSters,...<.<0ssascacasesorcerenes) OSMUNDA, Wo. 4 
TRIBE 4. OPHIOGLOSSACER. 
Thece in a branched spike .................. BoTRycH1uM, v. 4. 
Thece on aclub-shaped spike............... OPH10GLossuM, V. 4. 
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