16. HYMENOPHYLLUM. 63 



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

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

 sori 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., Loll). Peculiar in the 

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



32. H. Mrsutwn, 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 ; pinnae 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. fy Gr. Ic. Fit. t. 84. H. venustum & 

 angustum, F. D. B. H. Raddianum, Muller.fi, H. latifrons, V. D. B. ; fr. 

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



Hab. Tropical America, from Cuba and Jamaica southward to the Organ Mountains in 

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

 ciliatum. 



33. II. Chiloense^ Hk. ; st. 1-2 in. 1., not winged ; fr. triangular or ovate- 

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

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

 linear /MAIM, 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 pinnae on the upper side, divided about halfway down, the cuneate base 

 free or sunk in the frond ; valves semiorbicular, strongly ciliated. Hk. Sp. 1. 

 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. ciliatum, Swartz ; st. 1-2 in. 1., ciliated and decurrently 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 pinnae 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 

 of the lateral segments on both sides; invol. immersed, suborbicular ; valves divided 

 about halfway down, and conspicuously ciliated. Hk. Sp. 1. p. 88. Hk. &Gr. 

 Ic. Fil. t. 35. H. Plumieri, Hk. & Gr. Ic. Fil. t. 123. H. Boryanum, Willd. 

 Hk.Sp. I. p. BQ.t. 31. C. 



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

 South Brazil ; West Tropical Africa (Fernando Po, &c.), 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. ; vestitum, Presl ; 

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

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

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



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



