4.62 CXLIII. FILICES. 
TrisE 1. DicKsonIEs. 
Frond herbaceous. Sori on the back or at the edge of the 
frond. Involucre cup-shaped, often more or less completely 
2-valved. 
4. WOODSIA, R. Br. 
Involucre globose, membranous, cup-shaped, placed on the 
back of the frond and dorsal also on the veins, the edge 
fringed or irregularly-lobed.— Hook. and Baker, Syn. Fil. p. 46. 
Fronds small, herbaceous, ovate-lanceolate, 2- or 3-pinnatifid, the veins 
~ always free—A genus principally inhabiting the high mountains of the 
northern hemisphere, a single species of which has been recently discovered 
in the Natal Mountains. 
TriIBE 2. HyMENOPHYLLER. 
Texture of the frond beautifully pellucid and membranous ; 
the cells larger and laxer than in other ferns; the sori placed 
on the edge of the leafy portion, enclosed in tubular or cup- 
shaped involucres. Capsules seated on a filiform or clavate 
receptacle, which is often protruded beyond the mouth of the 
cup. 
5. HYMENOPHYLLUM, Smith. 
TInvolucre a cup, deeply divided into 2 valves.—Pappe and 
Rawson, p. 44; Hook. and Baker, Syn. Fil. p. 56. 
Fronds small or middle-sized, generally decompound with narrow divi- 
sions, and only asingle vein in the centre. Caudex a wide-creeping, thread- 
like rhizome.—3 South African species are known, 1 of which represents 
§ Leptocionium, and has toothed segments and involucres. 
6. TRICHOMANES, Linn. 
Involucre a deep tube-like cup, not at all slit or with the 
mouth only slightly 2-valved.— Pappe and Rawson, p.45 ; Hook. 
and Baker, Syn. Fil. p. 71. 
General habit as in Hymenophyllum, but frond usually less divided, and 
the receptacle more constantly and conspicuously protruded.—5 South 
African species are known, 3 of which grow nearly everywhere in damp 
tropical regions. 
TRIBE 3. DAVALLIEZ. 
Involucre roundish or oblong, marginal or dorsal on the 
veins and segments, always attached on the inner side of the 
sorus by the base, and usually, but not always, by the sides 
also, leaving the apex free. 
