686 CXLVII. FILICES, 
Barren fronds cttam. with divided segments. iie 
fronds spikelik py ore-cases in small den 
clusters all batik the rhachis + + + . . 8. HELMINTHOSTACHYS. 
Trier II, Marattiez. bie Spo" "= CASES without any perfect ring, opening in 2 valves 
or in  lngitwdinct slit, sessile or united, in 2 rows, in sori forming marginal lobes 
to the segments or placed. 0n "their under sw face 
Climbing ferns. Sori forming small lobes Wirdering 
the p pin p! ei the divided fronds , . . 4. LYGÓDIUM, 
Erect simple or dichotomous ferns, without xpanded 
] ori B fs i 
inae. 
tiguous and secand at the ends of the branches . 5$. SCHIZEA. 
bipi i ide b 
side in a continuous row on the under side of the 
margin. 
8 ntsn 
Spore-cases eie. sessilein 2r 6. ANGIOPTERIS. 
Spare-caneaii in 2r i but bonegtidetod into entire 
boat-s hada 7. MARATTIA. 
Trier III. Osmundeæ ve.— Spore- -cases globular or nearly so without any or with 
an imperfect or transverse ving, openi) ig in 2 valves or irregularly, few, sometimes 
solitary, rarely numerous and clustered in sori, on the under surface of the segments or 
innules, 
Fronds — barren ones with flat segments, 
fert with linear segments. Spore-cases large, 
the longitudinal veins and enclosed 
erm deni mar ini i - . . 8, CERATOPTERIS. 
Fronds sores ay pinnate, with 4 mall pinn innules, Sori of 
a e-cases, terminating transverse veins 
ing from the midrib 9. PLatyzoMA, 
Foki dichotomous, Pinnules s pinnately distichous, 
Sori of few spore-cases, attached to e branch 
of fo red veinlets proceedin er: the nid ib . 10, GLEICHENIA. 
be s pum ate. Sori of fe bir o numerous spori 
at the base of or covering ies order Lo 
NE fri the midrib : 
. 11. TODEA. 
E IV. Hymenophyllez.—Spore-cas SESS 
or nearly $0 0n & columnar receptacle eitis a T a or 2-1 erar poten a en- 
r pro seges from the margin of the frond. Fronds of a thin membranous 
half- peli texture 
up-shaped or tubular, with an en or 
AU 2-lobed EM Receptacle often ex- 
12. TRICHOMANES. 
"Indusium divided to bel elow ‘the middle into 2 valves, 
Receptacle usually included. . 13. HYMENOPHYLLUM. 
Trise V. hi ena ace Tree ferns. Fronds large, compound. Spore-cases small, 
with a more or less oblique ring, sessile on a slightly ise receptacle, in globular sort 
on the under surface T the fron 
cg at first uM SOME the sorus, at length 
cie under + . 14. CYATHEA. 
Indusium wh irs ts nid only by. the lower mar- 
gin and not forming a comple ring, o small 
to —emnméAnt . deed ido scias . « « 16. HzwrrELIA, 
ee .... . . . . . 16. ALsOPHILA. 
