58 16. HYMENOPHYLLUM. 



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

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

 throughout ; pinnae simple, linear, or forked or pinnatifid, with two or three 

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

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

 down or more, the base cuneate, the valves rounded. Hk. Sp. I. p. 101. H. 

 semibivalve, Hk. $ Gr. Ic. Fil. t. 33. 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. 

 Wrightii, V. D. B., and the Fuegian H. Darwinii, V. D. B. The New Zealand //. imbri- 

 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 pinnae alternate, about \ in. distant from one another, broadly rhomboidal, 

 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 ; the valves orbicular, strongly 

 toothed. Hk. Sp. 1. p. 109. t. 38. B. 



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

 resembling in habit a slender form of H. Tunbridgense. 



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, tripinnatind ; main rachis nearly wingless through- 

 out ; pinnae 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. Hk. Sp. Fil. 1. . 110. Hk. & Gr. 

 Ic. Fil. t. 198. 



Hab. Bourbon and Mauritius. The Van Diemen's Land H. Gunnii, V. D. B,, is 

 either the same plant or very near it ; and a plant from Chiloe, gathered by Cuming, is 

 probably the same. Intermediate in habit between the preceding and H. polyanthos. 



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 pinnae rhomboidal, 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. t. 38. A. H. macroglossum, V. D. B. 



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

 under //. scabrum. It is recognizable also by the large lanceolate pinnse which have the 

 central half entire. 



12. H. axillare, Swartz ; st. 1-2 in. 1., very slender; fr. 3-8 in. 1., f-1 in. br., 

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

 above only ; lower pinnae varying from under \ in. 1., with simple segments, to 

 \\ 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 

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

 entire. /$. Sp. I. p. 111. Hk. & Gr. Ic. Fil. 1. 124. H. apicale, V.D.B. Griseb. 



