16. HYMENOPHYLLUM. 61 



Hab. India, from Nepaul and Sikkim to Ceylon, the Malayan Peninsula, the Philip- 

 pines, New Zealand, and Australia. H. erosum of Blume, and If. Reinwardii, V. D. B., 

 also belong here. 



22. H. demissum, Swartz ; st. 4-6 in. 1., erect, firm, wingless ; fr. 4-12 in. ]., 

 3-4 in. br., ovate-triangular, 3-4 times pinnatifid ; rachis only slightly winged 

 above ; lower pinnae 2-3 in. 1., triangular-rhomboidal, divided down very nearly 

 to the rachis into numerous pinnls. on both sides, which are again divided down 

 nearly into the rachis into pinnatifid segm. ; ult. lobes 1-2 lin. J., lin. br. ; 

 sori very numerous (20-30) to a pinna, terminal and axillary on the segments 

 on both sides ; invol. divided down nearly to the base ; valves ovate, entire, or 

 denticulate. Hk. 8p. l.p. 109. H. productum, Kunze. 



Hab. New Zealand, Fiji, Java, the Philippines, and adjacent Polynesian Islands. A 

 larger and stronger plant than H. polyanthos, with which Sir W. Hooker was disposed to 

 join it, with ample glossy deeply-cut fronds and very numerous involucres. 



23. H. caudiculatum, Mart. ; st. 4-6 in. 1., wiry, broadly winged above ; fr. 

 6-12 in. 1., 2-3 in. br., orate-acuminate, tripinnatifid ; main rachis furnished 

 throughout with a broad slightly crisped wing ; lower pinnae rhomboidal-lanceo- 

 late, erecto-patent, often 2 in. ]., divided down to a broad central rachis, the 

 lower pinnl. again pinnatifid, the upper forked or simple, broadly linear; sori 

 2-12 to a pinna, placed at the apex of the segments on both sides ; invol. very 

 large (\ in. br.), divided down nearly to the base ; valves twice as broad as deep, 

 and bluntly toothed. ##. Sp. l.p. 102. jS, H. caudatum, V. D. B. ; wing of 

 the main and also of the second, rachis considerably crisped and undulated. 



Hab. Brazil, Peru, and Chili. Wing of the main rachis often 2 lines wide. 



24. H. recurvum, Gaud. ; st. 2-4 in. 1., winged above ; fr. 4-12 in. 1., 2-3 in. br., 

 flaccid, pendent, oblong-acrminate, tripinnatifid ; main rachis narrowly winged 

 throughout ; pinnae flaccid, erecto-patent, distant, elongated, divided down nearly 

 to the rachis into long simple or forked or slightly compound pinnls. ; ult. seam. 

 J- in. 1., \ in. br., sori 2-6 to a pinna, generally axillary ; invol. divided about 

 halfway down ; valves rounded, slightly forked. 1?*. Sp. 1. jt>*104. t. 37. C. 



Hab. Sandwich Islands, frequent. 



25. H. flalellatum, Labill. ; st. 2-4 in. l.,firm, erect ; fr. 4-12 in. 1., 2-4 in. br., 

 ovate-acuminate, tripinnatifid, somewhat glossy and flaccid ; main rachis winged 

 above ; lower pinnae 1-2 in. 1., broadly rhomboidal-acuminate, erecto-patent, 

 divided down to a broadly winged rachis into several cuneate-based pinnls., which 

 are furnished on both sides with several linear segm. ; sori 6-20 to a pinna, ter- 

 minal on the lateral segments ; invol. divided more than halfway down ; valves 

 rounded, entire./?*. Sp. 1. p. 111. H. nitens, Br. Hk. & Gr. 'ic. Fil 197. 



Hab. Australia, New Zealand, Lord Auckland Isles. Very variable in the compact- 

 ness, size, and degree of elongation of the fronds. H. Hookeri, Bory and V. D. B., is a 

 small form with narrower involucres than in the type. A plant from Sumatra must 

 probably be referred to this species. 



26. H. scabrum, A. Rich.; st. 2-4 in. 1., strong, wiry, ciliated ; fr. 6-15 in. J., 2-5 

 in. br., ovate-acuminate, tripinnatifid ; main racliis winged above, thickly ciliated 

 with long brown bristly hairs ; lower pinna; 2-3 in. 1., erecto-patent, oblong- 

 rhomboidal acuminate, divided down nearly to the rachis into several pinnl. 

 on both sides, which are again pinnatifid with compound lower and simple linear 

 upper segm. ; sori 6-20 to a pinna, terminal on the lateral segments on both 



