68 16. HYMENOPHYLLUM. 



53. H. Serra, Presl ; St. slender, wiry, 1-2 in. 1. ; fr. narrowly oblong-acu- 

 minate, pinnate, 3-4 in. 1., about 1 in. br. ; pinnce distichous, flabeliato-pinnatifid, 

 recurved ; the ult. segm. 3-5 lin. 1., very narrow, conspicuously spinuloso-dentate ; 

 son placed 1 or 2 in the upper side near the base of the pinnse ; invol. divided 

 two-thirds of the way down ; valves oblong, entire, or slightly toothed. 



Hab. Chiloe and Chili. Very near the preceding, but the segments very narrow and 

 remote, and almost confined to one side of the pinnae. 



54. H. tenerrimum, V. D. B. ; st. very slender, ^-f in. 1., naked ; fr. 1-2 in. 1., 

 less than \ in. br., pinnate, only the very summit winged ; pinnce distant, very 

 small and slender, simple or once or twice forked, vaguely undulato-dentate ; 

 sori 1 or 2 together, terminal ; invol. divided down nearly to the base ; valves 

 rounded and ciliated. V.D.B. Suppl.p. 101. 



Hab. Peru, Spruce, 4700 and 4702. Much the most slender and diminutive species 

 of the section. 



65. H. Jamesoni, Hk. ; st. 1-2 in 1. ; fr. flaccid, linear, 3-9 in. 1., -f in. br. ; 

 rachis only slightly winged towards the apex, fringed throughout with soft mem- 

 branous spines ; pinnce forked at the apex, and with only 1 or 2 linear segm. 

 on each side ; invol. axillary, solitary : valves obovate, conspicuously spinose. 

 Hk. Sp. 1. p. 96. t. 35. A. ' 



Hab. Andes of Columbia, Jameson. Readily distinguishable by its long narrow frond 

 and flaccid habit. The costa, like the rachis, is conspicuously fringed with membranous 

 spines. 



56. H. barbatum ; st. slender, erect, naked, 1 in. or less 1. ; fr. oblong-trian- 

 gular, l|-2 in. 1., about f in. br., tripinnatifid ; rachis winged throughout ; lower 

 pinnce rhomboidal-oblong, with a broad winged rachis and short broadly linear 

 spinuloso-dentate segm. ; sori terminal on the segments of the upper pinnse ; invol. 

 suborbicular or broadly oblong ; valves divided more than halfway down, and 

 deeply spinulose-dentate. Leptocionium barbatum, V. D. B. Suppl. p. 62. 



Hab. Tsus Sima, near Japan, Wilford, 846. A stouter plant than H. Tunbridgense, 

 with rachis winged throughout, broader segments, and terminal sori. 



57. H. secundum, Hk. & Gr. ; st. 1-3 lin. 1., wiry, naked ; fr. pinnate, linear- 

 oblong, 3-4 in. 1., 1 in. br. ; pinnce recurved, flabeliato-pinnatifid ; ult. segm. nar- 

 rowly linear, spinuloso-dentate, usually falcato-secund ; sori usually solitary, 

 placed on the upper side of the pinnae near the base ; invol. 2-valved about half- 

 way down ; valves oval-oblong, entire. ##. Sp. 1. p. 100. Hk. & Gr. Ic. Fil. 

 t. 133. 



Hab. Staten-land and Cape Horn. Near H. Tunbridgense, but a larger plant, with 

 two or three times dichotomous flabellate pinnse. 



58. H. Simonsianum, Hk. ; st. slender, wiry, naked, 1-2 in. 1. ; fr. linear- 

 oblong, 2-3 in. 1., | in. br., once pinnatifid down to a broadly- winged rachis ; 

 segm. fan-shaped, with only shallow divisions directed from the'apex towards the 

 base ; veins dichotomous, the margins spinuloso-dentate ; sori 1 to 4, terminal on 

 the divisions of the upper pinnse ; invol. broadly oblong, divided nearly to the 

 base ; valves spinuloso-dentate. Hk. 2nd Cent. t. 13. 



Hab. Khasia Hills and Sikkim, Simons, Griffith, Dr. Hooker. The least divided species 

 of this section. 



59. H. pectinatum, Cav. ; st. 2-4 in. 1., wiry, naked ; fr. oblong, pinnate, 3-6 

 in. 1., 1^-2 in. br. ; main rachis only winged towards the apex ; pinnce with only 



