60 16. HYMENOPHYLLUM. 



Hab. Gathered by Dr. Hooker in the Sikkim Himalayas, at an elevation of 11,000 ft., 

 and determined by Van den Bosch from his specimens. Intermediate in habit between 

 H. exsertum and polyanthos. 



18. H. poli/anthos, Swartz ; st. 2-3 in. 1., slender, wingless ; fr. 2-8 in. 1., 1-3 

 in. br., ovate-oblong 1 , tripinnatifid ; main rachis usually only narrowly winged 

 above ; lower pinnce triangular-fhomboidal, divided down to a narrow centre 

 into several pinnl. on each side, the lowest of which are cuneate or rhomboidal, 

 deeply pinnatifid ; ultimate segm. linear, 1-1| lin. 1., less than lin. br. ; sori 2-12 

 to a pinna, terminal or axillary on the segments on both sides; invol. small, 

 divided down nearly to the base ; valves ovate or rounded, entire or slightly 

 denticulate. Hk. Sp. 1. p. 107. H. protrusum, Hk. Sp. I. p. 104. t. 37. B. 



Hab. Widely diffused throughout the Tropics, and extending a little beyond them 

 both north and south ; America, from Cuba and Jamaica southward to Brazil, S. Chili, and 

 Juan Fernandez ; Asia, Nepaul and Sikkim to Ceylon, Tsus Sima, Malayan Peninsula, 

 Java, and New Zealand ; West Tropical Africa, Mauritius and Madagascar. This 

 includes nearly, or quite, thirty of the species defined by Van den Bosch. It is a plant 

 of slender flaccid habit, as compared with species 19 to 28, with the segments sometimes 

 decurved, and when dry slightly crisped. The New Zealand H. mllosum of Colenso has 

 the stipes and rachis very slightly hairy. The Malayan H. Mumeanum, Spr., has 

 narrower and more elongated fronds than in the type, and pinnae sometimes simply pin- 

 natifid only. 



19. H. Andinum, V. D. B. ; st. 3-6 in. 1., slender ; fr. 6-12 in. 1., 1-2 in. br., 

 flaccid, oblong, tripinnatifid ; main rachis narrowly winged above ; pinnce 

 .distant, the lower oblong-rhomboidal, divided down to "a narrow centre, with 2-3 

 pairs of pinnl. which are flabellately or laterally cut into a few linear segm. ; 

 sori 2-12 to a pinna, terminal or axillary on the segments on both sides ; invol. 

 divided more than halfway down ; valves rounded, with a blunt point, entire. 



Hab. Andes of Ecuador, Jameson. Closely allied to H. polyanthos, but elongated and 

 flaccid in habit, with fewer, more distant and less divided segments. 



20. H. badium, Hk. & Gr.; st. 2-3 in. 1., slender, winged above; fr. 4-12 in. 1., 2-3 

 in. br., oblong or ovate-lanceolate, acuminate, tripinnatifid ; main rachis broadly 

 winged throughout ; lower pinnce lanceolate-rhomboidal, divided down to a broadly 

 winged rachis^into several pinnl. in each side, the lowest of which are a few 

 times deeply incised, ultimate divisions broadly linear; sori 2-12 to a pinna, 

 terminal and axillary on the segments on both sides ; invol. nearly 1 lin. br., 

 divided down nearly to the base ; valves rounded, nearly twice as broad as deep, 

 the outer edge denticulate. #. Sp. 1. p. 102. Hk. $ Gr. Ic. FiL t. 76. 



Hab. Malayan Peninsula, Sir W. Norris ; East Indies (probably Nepaul), Dr. Wallich. 



21. H. Javanicum, Spreng. ; st. 2-4 in. 1., erect, margined above with a broad 

 crisped wing ; fr. 4-8 in. 1., 3-4 in. br., triangular, tripinnatifid ; main rachis 

 bordered throughout with a broad crisped wing ; lower pinnce 1^-2 in. L, trian- 

 gular-rhomboidal, erecto-patent, divided down to a narrow crisped centre into 

 several plane or slightly crisped pinnl. on both sides, the lower of which are 

 several times deeply pinnatifid ; sori 6-20 to a pinna, terminal and axillary on 

 the segments on both sides ; invol. about as broad as the segments, divided down 

 nearly to the base ; valves orbicular, entire or denticulate. Hk. Sp. 1. p. 106. 

 H. fimbriatum, J. Sm. Hk. Sp. 1. p. 102. t. 36. C. H. flexuosum, Cunning. 

 Hk. Sp. I. p. 105. Ic. PL t. 962. H. crispatum, Wall. Hk. 8? Gr. Ic. FiL t. 

 77. H. daedaleum, Blunie. II. micranthum, V. D. J3. P, H. atrovirens, 

 Colenso ; segm. of the frond nearly plane ; invol. smaller and narrower. H. Tas- 

 manicum, V. D. B. 



