Gleichenia.'] 
FILICES. 
461 
midrib, consisting of not more than 4 or 5 capsules. G. muricata, 
Bojer , Sort. Maur. 421. 
Mauritius, in woods at Moka, Savanne, Grandport, etc. Also Bourbon, Mada- 
gascar, and the Malayan and Polynesian islands. 
2. HYMENOPHYLLUM, Linn. 
Capsules sessile, densely crowded on a subulate receptacle, broader 
than long, furnished with a broad transverse ring and opening irregu- 
larly from the top. Sori marginal on the segments, terminating on the 
veins, enclosed in a persistent cup-shaped involucre, which is split into 
two valves to below the middle. — Small ferns of filmy texture, various in 
cutting, with wide-creeping thread-like rootstocks, usually forming 
dense masses. Distbib. All tropical and warm temperate regions. 
Species 80. 
Fronds glabrous. Segments not toothed. 
Fronds small, bipinnatifid, with rachis not winged in 
the lower half • . 1. H. rarum. 
Fronds small, tripinnatifid,with rachis winged through- 
out 2. H. TENELLUM. 
Fronds middle-sized, 3-4-pinnatifid. 
Segments few, not crowded 3. H. in^equale. 
Segments many, crowded . . 4. H. polyanthus. 
Fronds hairy. Segments not toothed. 
Fronds lanceolate, under an inch broad ..... 5. H. Boutoni. 
Fronds oblong-deltoid, 1-4 in. broad. 
Main rachis winged throughout 6. H. ciliatum. 
Main rachis winged only at the very top . . . . 7. H. hygrometricum. 
Fronds glabrous. Segments distinctly toothed . . . 8. H. Tunbridgense. 
1 H. rarum, B. Br.j Sook. and Baker , Syn. Fit. 58. Stipe 
slender, wiry, \-l in. long. Frond flaccid, pendulous, glabrous, 1-2 
in. long, \ in. broad, lanceolate, narrowed to the base, bipinnatifid, 
the rachis winged in the upper half; the most compound pinnas with 
very few segments and a broadly winged rachis. Ultimate segments 
i in. long, gT i n - broad, quite entire. Sori few to a frond, the in- 
volucre as broad as the segments, with an immersed base and semi- 
circular valves. H. fumarioides, Bory; Bojer , Sort. Maur. 411. 
Mauritius, damp rocks and trees of Savanne, Grand Bassin, and Pouce ranges. 
Round the world, principally in the southern hemisphere. 
2. H. tenellum, Kuhn ; Sook. and Baker, Syn. Fil. edit. ii. 57. Stipe 
|-1 in. long, winged in the upper half. Frond glabrous, 1-2 in. long, 
f-1 in. broad, oblong, 2-3-pinnatifid. Pinnae few, only the lowest 
divisions forked. Main rachis distinctly winged throughout. Ulti- 
mate segments i n - long, 2 1 * in. broad, entire, much more 
numerous than in S. rarum. Sori few to a frond, terminal on the 
upper segments. Involucre immersed at the base, with semicircular 
valves, as broad as the segments, the receptacle sometimes protruded. 
