58 16. HYMENOPHYLLUM. 



8. H. rarum, R. Br. ; st. very slender, 1-3 in. 1. ifr. flaccid, pendent, 2-6 in, 1. 

 by 1-2 in. br., linear-oblong or oblong, bipinnatifid, tlie main rachis winged 

 throughout ; pinnce simple, linear, or forked or pinnatiiid, with two or three 

 deeply-cut segments on each side, which are ^-^ in. 1., 1 lin. br. ; sort large, 

 terminal on the segments of the upper pinnae, often 1 lin. br., divided halfway 

 down or more, the base cuneate, the valves rounded. — Mk. Sp. 1. p. 101. H. 

 semibivalve, Hk. ^ Or. Ic. Ml. t. 83. H. natalense and tabulare, F. D. B. 



Hab. New Zealand, Auckland Isles, Van Diemen's Land, Mauritius, Natal, and Cape 

 Colony. — A plant from Chiloe, gathered by Cuming, must probably be referred here ; 

 and in the specimens to which I have access I cannot distinguish the Japanese H. 

 Wrighiii, Y. D. B., and the Fuegian ff. Darwinii, Y. D. B. The New Zealand M. imtri- 

 catum of Colenso differs by having the rachis much shortened, scarcely more than 1 in. 1., 

 and the pinnae imbricated and slightly crisped. This and the two preceding differ from 

 the species that follow next by their much broader segments 



9. H. capillaceum, Roxb.; St. about 1 in. 1., slender ; fr. 2-4 in. 1., by 1 in. or 

 more br., oblong, pinnate, with distant segments ; main rachis free throughout ; 

 lower pimm aXiecnaXs, about ^ in. distant from one another, broadly rhomboidalj 

 cut down to the rachis in the lower part but winged above ; segm. |- in. 1., 1 lin. 

 br., simple or once forked ; sori 2-6 to each pinna, terminal on the lateral 

 segments ; invol. divided down nearly to the base ; tlie valves orbicular, strongly 

 toothed.— .ff*. Sp. I. p. 109. t. 38. B. 



Hab. Confined to the island of St. Helena, where it has been long known. — Mud 

 resembling in habit a slender form of H. Tmibridgense. 



10. H. gracile, Bory; st. 2-3 in. 1., slender, wiry ; fr. 2-6 in. 1., 1-2 in. br., lan- 

 ceolate or oblong-acuminate, tripinnatifid ; main rachis nearly wingless through 

 out ; pinnce distant, 1-3 in. 1., broadly rhomboidal, erecto-patent, cut down 

 within a very short distance of the rachis ; pinnl. sometimes simple, sometimes 

 again pinnatifid, with simple or forked narrowly linear divisions; sori large, 2-4 

 to a pinna, terminal or axillary on the lateral segments ; invol. not divided 

 more than halfway down ; valves rounded. — Hh. Sp. Fil. \.p. 110. Hk. <& Or. 

 Ic. Fil. t. 198. H. inaequale (Foir.) oldest name. 



Hab. Bourbon and Natal, Mauritius. 



11. H. exsertum. Wall. ; st. 1-2 in. 1., slender ; fr. 2-6 in. 1., 1-2 in. br., lanceo- 

 late-oblong, bipinnatifid ; main rachis winged above or throughout, more or less 

 densely clothed with deciduous ferruginous hairs; lower pinnos ■shamhoii&l, lan- 

 ceolate-acuminate, divided more than halfway down to the rachis into simple 

 or forked linear pinnules, slightly hairy on the principal veins ; sori 2-8 to a 

 pinna, terminal or axillary on the segments on both sides ; invol. divided down 

 nearly to the base ; valves oblong, bluntly denticulate at the apex. — Hk. Sp. 1 . 

 p. 109. *. 38. A. H. macroglossum, V. D. B. 



Hab. HiUs throughout India, from the Himalayas southward to Ceylon. — See remarks 

 under H. scairum. It is recognizable also by the large lanceolate pinnae, which have the 

 central half entire. 



12. H. axillare,_Swa,vtz; st. 1-2 m. i., very slender ; fr. 3-8 in. 1., |-1 in. or., 

 flaccid, pendent, linear-oblong, tripinnatifid ; main rachis winged throughout or 

 above only ; lower pinnce varying from under J in. 1., with simple segments, to 

 li in. 1., divided down nearly to the rachis, with pinnatifid pinnules with several 

 segments ; ult. segm. not more than 1 lin. 1. ; sori 2-12 to a pinna, terminal 

 oii the lateral segments ; invol. divided more than halfway down ; valves rounded, 

 entire.— Hk. Sp. l.p. 111. Hk. S Gr. Ic. Fil, 1. 124. H. apicale, V.D.B. Griseb. 



