74 
THE FERNS OF SOUTH AFRICA 
where there is constantly a saturated atmosphere. Fronds 
pellucid, consisting mostly of winged veins. Involucre terminal 
on some of the pinnules, composed of two flattened or concave 
valves, connected at the base, and containing between them 
the prolonged apex of the vein, which becomes an elongated 
receptacle, surrounded by capsules on all sides, and often 
with a point extending beyond them. Capsules flattened, 
surrounded by an obliquely transverse entire ring, and bursting 
irregularly. The genus contains about 235 species, mostly 
tropical or subtropical. 
Key to the species : 
§ Frond glabrous, not toothed. 
5. H. fumarioides, rachis winged, frond bipinnatifkl, pinnules wide. 
6. H . inaequale , rachis not winged, frond tripinnatifid, pinnules 
narrowly linear. 
Frond ciliated and hairy. 
7. H. Marlothii , rachis winged, frond ovate-triangular, clothed with 
stellate hairs. 
8. H. ciliatum , rachis winged above, frond oblong-acuminate, 
ciliated. 
9. H. linear e, rachis not winged, frond linear lanceolate. 
§§§ Fronds toothed at the margin. (Leptocionium, Presl.; and v. d. 
Bosch.) 
10. H. tunbridgense , frond triangular, tripinnatifid, rachis winged 
upward. 
11. H. uncinatum , frond linear lanceolate, 2— 3-pinnate, rachis not 
winged. 
5. HYMENOPHYLLUM FUMAPvIOIDES Willd. 
Plate 3. Fig. 2. Nat. size, b Pinnule and involucre, enlarged. 
Rhizome very slender, black. Stalk one inch long, slender. 
Frond pinnate, one to four inches long, four to eight lines 
broad at the base, tapering upward, pendent from the top of 
the stalk. Rachis winged for most of its length, pinnae neither 
toothed nor hairy at the edge, lower side undivided, upper 
side with three to five blunt pinnules, each one to three lines 
long, one line broad ; upper pinnae simple or forked, involucre 
inflated, wider and shorter than in the other species, lobes 
often one line broad, a half line long, divided to the lamina, 
and light coloured. 
