16. HYMENOPHYLLUM. G3 



to the base, the divisions linear, dichotomously branched ; ult. segm. 1-3 lin. I., 

 lin. br., the surface hairy, and the margin ciliated with branched rufous hairs ; 

 son terminal, solitary, orbicular the cuneate base sunk in the frond ; valves 

 ciliated. 



Hab. Borneo, on hills near Sarawak, at an alt. of 2,700 ft., Lobb. Peculiar in the 

 group by resembling in habit the species of the Gonocormus section of Trichomanes. 



32. H. Mrsutum, Swartz ; st. 1-2 in. 1., slender, naked or slightly winged and 

 ciliated above ; fr. linear-oblong, once pinnatifid, 2-6 in. 1., about in. br., 

 slender, flaccid, often pendulous, hairy over the surface ; pinnce short, close, 

 erecto-patent, simple, linear-oblong, or cuneato-flabellate, with 1 to 4 divisions ; 

 ult. segm. rather broad, closely ciliated ; sori 1 to 4 on a pinna, terminal on the 

 segments ; invol. suborbicular, the cuneate base sunk in the frond ; valves free, 

 very hairy. Hk. Sp. 1. p. 88. Hk. 8f Gr. Ic. Fil t. 84. H. venustum & 

 angustum, V. D. B. H. Raddianum, Mutter. p, H. latifrons, V. D. B. ; fr. 

 larger and more dilated than in the type ; segm. \ in. br. 



Hab. Tropical America, from Cuba to South Brazil and Patsgonia, Mascaren Isles. 

 H. latifrons bears the same relation to the type that H. splendidum does- to 

 ciliatum. 



33. H. cMZoense, Hk. ; st. 1-2 in. L, not winged ; fr. triangular or ovate- 

 lanceolate, bipinnatifid, 1-2 in. L, i-1 in. br. below ; main rachis zigzag, ciliated, 

 and broadly winged ; lower pinnce rhomboidal-oblong, with several rounded or 

 linear pinnl. on both sides, the margin regularly ciliated, with short strong hairs 

 and the under surface of the frond slightly hairy ; sori placed singly at the base 

 of the pinnse on the upper side, divided about halfway down, the cuneate base 

 free or sunk in the frond ; valves semiorbicular, strongly ciliated. Hk. Sp. I. 

 p. 90. t. 32. A. Leptocionium dicranotrichum, Presl. 



Hab. S. Chili and island of Chiloe. Placed by Presl and Van den Bosch in section 4 

 but its proper position is here. 



34.. H.-otfiatom, Swartz ; st. 1-2 in. L, ciliated and decurrentlv winged above 

 fr. oblong-acuminate, tripinnatifid, 2-6 in. 1., 1-2 in. br. at the centre ; main 

 rachis broadly winged throughout and ciliated; lower pinnce oblong or rhomboidal, 

 with a broad central undivided portion, and numerous erecto-patent simple or 

 forked ciliated linear segm. 2-3 lin. 1. ; sori 2 to 12 on a pinna, placed at the end 



Hab. Common in Tropical America, from Cuba and Mexico southward to Chili and 

 South Brazil ; East Himalayas ; West Tropical Africa, and in the East in the Zambesi 

 district and the islands (Mauritius, Madagascar, Bourbon, Seychelles, and Johanna 

 Island). The African plant, well known under the name of Boryanum, seems quite to 

 coincide with the American ciliatum. It has also been gathered in New Zealand lately 

 by Mr. Travers. Eleven species, admitted by Van den Bosch, do not appear materially 

 different ; viz. those already mentioned, and trapezoidale, Liebm. ; vestilum, Presl ; 

 apterum, remotum, surinamense, Presl ; commutatum, Presl ; Schiedianum, Presl, and 

 splendidum. The latter is a magnificent form, with fronds 1 ft. 1., pinnas ^ in. and 

 rachis | in. br., which occurs in Guatemala, Ecuador, and West Tropical Africa. 



35. H. obtusum, Hk. & Arn. ; st. 2 in. 1., slender, ciliated ; fr. 2-4 in. 1., 1-2 in. 

 br., lanceolate or ovate-lanceolate, tripinnatifid ; main rachis winged throughout; 

 lower pinnae lanceolate or triangular-rhomboidal, cleft nearly to the rachis into 

 several linear simple or forked pinnl. on both sides, the surface and margin 

 copiously clothed with pubescence ; sori 2 to 6 to a pinna, terminal on the lateral 



