GENERA AND SPECIES. 
Sori short or globular, the slightly altered iin 
bent over them ‘ 
Sori and indusium linear, cradle pat gat con- 
tinuous; fronds compound 
Sori in a continuous line on both sides of the aidetl, 
the indusium opening from the midrib outwards; 
sori at length EEE the underside of the fertile 
fronds 
Sori and indusium oblong, or pnts on veins diverging 
from the midrib.. 
Sori orbicular, Beoalty small ; in a hen aiieehed ohn 
the sorus, peltate or orbicular-reniform 
b. Sori without indusium. 
Sori orbicular, usually small : 
Sori linear or oblong, on veins diverging oe the warieleil 
Sori short often confluent; covered by the recurved 
margin of the frond, forming a spurious indusium... 
Ophioglossum. 
Barren frond ovate-lanceolate, sessile near the middle 
of stem, but distant from the spike. Quite dwarf 
Botryehium. 
Sterile frond ene -stalked, eas fun and Doan 
divided . . : 
Schizaea. 
Stalk of the fertile fronds undivided, filiform, channelled 
Stalk of the fertile fronds, mostly twice divided, sori- 
ferous; pinnules linear, flat, about 3 to 4 lines long 
Gleichenia. 
Pinnules divided to the midrib into many, flat, rather 
stiff, segments, each with a single sorus 
Osmunda. 
Rhizome erect forming a short broad trunk; fronds at- 
taining to 6 feet long, s'DREnS: pinnules of a firm 
consistence : ee ae 
DieKsonia. 
Rhizome arborescent. (Here probably extinct). 
Lindsaea. 
Fronds pinnate, rhachis black wiry; pinnules small, dis- 
tant, obliquely flabellate he 
201 
Cheilanthes 
Pteris 
Lomaria 
Asplenium 
Aspidium 
Polypodium 
Grammitis 
Cheilanthes 
vulgatum 
ternatum 
fistulosa 
bifida 
circinata 
barbara 
Billardieri 
linearis 
