16. HYMENOPHYLLL'M. 69 



Hab. West Indian Islands and Venezuela. — Both this and H. myrioca/rpvm are some- 

 times slightly crisped. 



13. H. rmiforme, Hk. ; St. very slender, naked, 2-3 in. 1. •,fr. 3-6 in. 1., 1 in. or 

 less br., flaccid, pendent, linear-oblong, fully bipinnate ; main rachis wingless 

 throughout ; pinnae usually under 1 in. 1., divided quite down to the rachis ; 

 pinnl. simple or forked, or slightly pinnatifid ;' the ultimate sym. very narrowly 

 linear ; sort 2-6 to a pinna, at least twice as broad as the lobes ; irmol. divided 

 down nearly to the base : vakes rounded and denticulate. — Hh. Sp. 1. v. 1 10. 

 t. 38. C. 



Hab. Andjs of Ecuador and Peru. — Allied to H. axillare and erispvm m habit, but 

 readily distinguishable by its truly bipinnate frond and very narrow segments. The 

 specific name applies here to the shape of the involucre, not, as in Trichoma/nes, to that 

 of the frond. 



14. H. crispum, H B. K. ; st. very slender, 1-2 in. 1., wingless ; fi: 3-6 in. I., 

 1 in. or less bv., flaccid, pendent, linear-oblong, tripannatifid ; main rachis only 

 slightly or hardly at all winged above ; pinnae 1 in. 1. or less, rhomboidal-oblong, 

 beautifully and delicately undulato-crisped throughout, divided down nearly to 

 the costa into pinnl., which are again pinnatifid ; sori numerous, very small, 

 placed at the apex of the segments ; invol. rather wider than the lobes, rounded, 

 crisped at the edge. — Hh. Sp. l.p. 107. H. amoenum, Sturm. 



Hab. Tropical America, from Mexico and Cuba southward to Peru and Brazil. — 

 Closely allied to IT. axillare in habit, but distinguished by its crisped fronds. 



15. H. undulatum, Smith ; St. 1-2 in. 1., very slender ; fr. 3-6 in. 1., scarcely 

 more than 1 in. br., flaccid, pendent, ovate or linear-oblong, tripinnatifid ; main 

 rachis winged ; pinnce undulato-crisped, oblong-rhomboidal, divided down to a 

 narrow central portion ; pinnl. crowded, the lower ones a little pinnatifid ; sori 

 2-6 to a pinna ; inml. divided down nearly to the base ; vahes rounded, slightly 

 crisped towards the margin, but not denticulate. — Hk. Sp. 1. p. 105. Ic.Pl. t. 964. 



Hab. Mexico, Jamaica, Peru. — Both this species and H. crispum have the segments 

 so much crisped that they bear the appearance of being toothed like a Leptocionmm. 

 This and the three preceding resemble one another in their small tender narrow Haccid 

 fronds. 



16. H. myriocarpium, Hk. ; st. 2-3 in. 1., erect, slightly winged above ; fr. 3-12 

 in. 1., 2-3 in. br., flaccid, pendent, ovate-lanceolate, tripinnatifid ; racAjs furnished 

 with a narrow wing throughout ; lower pimnoe 1-3 in. 1., lanceolate-rhomboidal, 

 divided down nearly to the rachis on both sides into several pinnl.. Which are 

 again pinnatifid with numerous membranous linear segments, not more than 

 1 iin. 1. ; sori very numerous, terminal and lateral on the segments on both sides ; 

 inml. divided down to the base ; vahes ovate or rounded, entire or sinuated at 

 the apex.— JM. Sp.l.p. 106. t. 57. D. 



Hab. Mexico, southward to the Andes of Peru. — Closely allied to H. axillare, but 

 rather stronger in habit, and the fronds broader below. Connects the four preceding 

 species with H. polyantJios. 



17. H. microsorum, V. D. B. ; st. 1-2 in. 1., slender, naked ; fr. 2-3 in. 1., about 

 1 in. br., flaccid, oblong-lanceolate, tripinnatifid ; main rachis naked, furnished 

 with'a narrow wing nearly or quite to the base ; lower pinnce oblong-rhomboidal, 

 about 1 in. 1., erecto-patent, divided down to a narrowly-winged rachis into 

 several pinnl., the lower of which are obversely triangular in shape and flabel- 

 lately cut ; sori 2-12, terminal on the segments of both sides of the upper pinnae, 

 very small ; invol. divided more than halfway down ; the vahes rounded, 

 entire. 



