GENERA OF FERNS. 497 
from 1 to 3, or 4 feet high ; sporangia rarely immersed in a 
cystiform cavity ; sori inframarginal. 
Examp. 1. M. pinnata, (Cav.) (Davallia a Wall.) 
2 M. gracilis, (Blume.) 3. M.scabra (Don.) 4. M. platy- 
phylla, (Don.) (Davallia lonchitidea, Wall.) 5. M. rhom- 
boidea, (Waill.) 6. M. flaccida, (R. Br.) 7. M. adiantoides, 
(Sw.) 8. M. distans, (Kaulf.) 9. M. alata, (Hew.) 10. M. 
cristata, J. Sm. 11. M. trichosticha, J. Sm. 12. M. 
hirta, (Kaulf.) 
lilust. Hook. Gen. Fil. t. 58. A. 
Obs. Habit must again be viewed as the principal mark of 
distinction between this and the former genus. 
106. Deraria, Hook. et Grev. 
(Dicksonie, sp. Kaulf. Cibotiz sp. Presl.) 
Veins pinnate ; venules simple, direct, their apices free and 
sporangiferous ; special indusium forming with the indusii- 
form dents a calyciform exserted cyst ; sporangia pedicellate, 
vertical; sori globose, extramarginal. 
Fronds éipinnatifid, 2 to 3 feet high, smooth, lacinie 
equal. 
Species. 1. D. prolifera, Hook. et Grev. (Dicksonia, Kaulf.) 
lilust. Hook. et Grev. Ic. Fil. t. 154. Hook. Gen. Fil. t. 44. 
B. 
Obs. The exserted sori constitute the chief distinction 
between this genus and the previous one ; and on viewing 
eparia along with Microlepia adiantoides, a gradual transi- 
tion of structure in the connivence of the indusium with 
the margin is seen to connect them with genera belonging 
to the succeeding section Dicksonie. 
107. DAVALLIA, Sm. J. Sm. 
Veins forked ; venules direct, their apices free and sporan- 
iferous ; sori vertically oblong, inframarginal ; indusium 
usually "Zeen forming with the concave indusiiform mar- 
gin a vertical urceolate or tubular cyst: its apex usually 
constricted ; sporangia pedicellate, free. 
