11 
Receptacles normal, i. <?., the Spore-cases attached to the surface of the frond. 
punctiform. 
linear, transverse. 
[a 3] Receptacles short, transverse or arcuate on the venules, sub-parallel with the midrib or 
margin. 
Sori non-indusiate. 
(2) Sori parallel with the venation, oblique (rarely sub-parallel) to the midrib, oblong linear or 
moi'e or less elongated, sometimes compound. 
(«) Sori indusiate, lateral or sub-lateral on the veins. 
{h) Sori naked or spuriously indusiate, dorsal on the veins. 
(a) Receptacles linear, variously reticulato-anastomosed. 
(/3) Receptacles linear, simple or forked, (sometimes short linear) i. e., oblong. 
(c) Receptacles oblong, contiguous, parallel,theSpore-cases becoming confluent and simula- 
ting a broad marginal sorus (spuriously indusiate.) 
(3) Sori punctiform, (rarely in § 15, sub-oblong, or by confluence more or less elongate.) 
('/) Sori naked, z'.c., without true indusia ; (fertile fronds sometimes contracted with involute 
margins— spuriously indusiate. ) 
{b) Sori indusiate, i. c, with superior indusia. 
(a) Indusium reniform or peltate, attached by the sinus or centre, free at the mar- 
gins, (fertile fronds sometimes involutely contracted.) 
(/3) Indusium rotundate, attached transversely to the vein by its base, the margins 
free. 
(c) Indusium roundish or oblong, adherent at the base and margins, opening in fronts 
i. e., exteriorly. 
{c) Sori involucrate, i. e., with inferior indusia. 
(ffl) Indusium or involucre distinctly within the margin of the frond, forming an entire 
lobed or fimbriated cup ; Sori therefore within a dorsal cup. 
Hing more or less ohllquehj vertical, nearly complete, narrow, S2Mre-cases crowded, sessile or 
sub-sessile, oblique-laterally cojupressed, or sub-comjyressed, bursting horizontally. 
Sori involucrate, i. e., indusia inferior, (receptacles elevated.) 
Fructifications dorsal. 
Sori naked, i. e., without indusia ; (receptacles elevated.) 
Ming horizontaily or rarely obliquely transverse complete, S2)ore-cases sessile or sub-sessile, 
usually vertically compressed, bursting longitudinally, i, e., vertically. 
Ring zonal, i. e., spore-cases girt by the ring. 
Sori-dorsal ; (fronds rigid opaque with oligocarpus Sori, and globose-pyriform, spore-cases.) 
Sori extrose-marginal (fronds usually pellucid membranaceous, with polycarpous sori and 
lenticular spore-cases.) 
Ring apical, i. e., spore-cases crowned by the convergent Strias of the ring— radiate striate at 
the Apex. 
Strise united at the Apex, without any vacant space, (spore-cases attached laterally ;) scand- 
ent plants. 
Stripe disjoined, forming an orbicular apical vacuity, (spore-cases attached basally ;) dwarf 
herbaceous plants. 
II II II II Ring rudimentary or incomplete (ivayitijig one-third or more ;) very broad, flat ohliqxieJ y 
vertical ; spore-cases sessile or sub-sessile, globose. 
[A] 
(1) 
[B] 
[A] 
(1) 
(2) 
[B] 
(1) 
(2) 
Cheilantheie. 
Pterideiie. 
)^ 10. 
Meniscieiie. 
§ 11. 
Aspleniea?. 
§ 12.^ 
Hemionitide;!?. 
§ 13. 
Gymnogrannneiie. 
§ 14. 
Platylomcic. 
§ 15., 
Polypodiefe. 
§ 16. 
Aspidiea\ 
§ 17. 
Cystopteridere. 
§ IS. 
Davalliea\ 
§ 19. 
Feranemea-'. 
Tribe 2. 
Cyatheine.e. 
§ 1- 
C'j'athese. 
§ 2. 
Alsophilese. 
Tribe 3. 
Gleichenine^. 
Tribe 4. 
Tbichomanine^. 
Tribe 5. 
SCHIZ.EINE.E. 
§ 1- 
Lygodieae. 
§2. 
Schizceeee. 
