16. HYMENOPHYLLUM. 65 



Hab. Confined to the Mauritius and Bourbon, where it is abundant. It is question- 

 able whether this is distinct from the preceding. 



41. H. Lindeni, Hk. ; st. 4-6 in. 1., stout, erect, villose ; fr. often recurved, 

 6-12 in. 1., 4-6 in. br., ovate-acuminate, tripinnatifid ; mainrachis villose, winged- 

 in the upper part ; lower pinnae 2-4 in. ]., elongate-lanceolate, with numerous 

 deeply-divided pinnl. on both sides, both surfaces hairy ; sori very numerous, 

 terminal on the segments ; valves short and broad, strongly ciliated. Hie. Sp. \.p. 

 94. t. 34. C. H. spectabile, Moritz. 



Hab. Andes of Venezuela and Ecuador. 



42. H. microcarpum, Desv. ; rhizome clothed with woolly yellow hairs ; st. 4-6 

 in. 1., firm, tomentose, slightly winged above ; fr. ovate-triangular, tripinnatifid, 

 6-12 in. 1., 3-5 in. br. ; main rachis furnished with a narrow wing throughout, 

 and move cr less tomentose, the frond slightly hairy, the margin subdenticulate 

 and ciliated ; central pinnae rhomboidal-oblong, with several pinnl. on each side, 

 which are deeply cut into narrow linear segm. ; sori 2 to 12 to a pinna, placed 

 at the apex of the lateral segments of the upper pinnae ; invol. ovate, free, divided 

 down to the base ; valves between toothed and ciliated. H. Organense, Hie. Sp. 

 I. p. 90. t. 32. B. H. Beyrichianum, Kunze. Hk. Sp. I. p. 91. 



Hab. South America, Venezuela and Ecuador, southward to Peru and the South of 

 Brazil. H. Lindigii, Mert., and H. Ruizianum, Klotzsch, are allied to this species. 



43. H. valvatum, Hk. & Gr. ; st. 1-3 in. 1., naked or slightly winged above; 

 fr. ovate-triangular, acuminate, tripinnatifid, 4-6 in. ]., 1^-2^ in. br. below ; 

 main rachis winged throughout ; pinnae slightly hairy and ciliated, the lower 

 ones triangular, with deeply pinnatifid pinnl. ; ult. segm. linear, with the limb 

 (not the margin) on each side of the midrib considerably waved and undulated ; 

 sori 12 to 20 to a pinna, terminal on the segments of the upper ones on both 

 sides ; invol. ovate, divided down nearly to the base ; valves glabrous or slightly 

 ciliated. HL & Gr. Ic. Fil. 219. Hk. Sp. 1. p. 90. II. pteropodum & piaty- 

 lobum, V. D. B. 



Hab. Nicaragua, Guadeloupe, Martinique, Andes of Columbia and Peru, ascending 

 to 6,000 ft. Of H. divaricatum and Orbignianum, placed by Van den Bosch near val- 

 vatum, I have not seen specimens. 



44. H. Sprucei^ Baker ; st. 1-2 in. 1., slender, hairy ; fr. 3-6 in. 1., 1-2 in. br., 

 lanceolate or oblong-acuminate, bipinnatifid ; rachis winged throughout, or only 

 in the upper half, pilose, the frond furnished with scattered stellate hairs on the 

 midrib and margin ; lower pinnce spreading, rhomboidal-lanceolate, cut down 

 nearly to the rachis into simple or once forked linear erecto-patent pinnl., which 

 are about | in. 1., and somewhat crisped or undulated as well as furnished with 

 rather distant strong stellate hairs along the edge ; sori 2 to 6, terminal on the 

 segments of the lateral pinnae ; invol. cut more than halfway down ; valves 

 rounded and ciliated with hairs like those of the segments. 



Hab. Tarapota, E. Peru, Spruce. This also, like H. Chiloense, might easily be taken 

 for a serrated species. It resembles in habit the small forms of H. interruptum, but the 

 frond is much thinner, and the hairs are confided to the ribs and edges. 



45. H. interruptum, Kunze ; st. 1-2 in. 1., wiry, naked or slightly ciliated ; fr. 

 pendent, varying from 6 in. to nearly a yard in length, 2-5 in. br., elongato- 

 lanceolate or oblong in general outline, bipinnatifid ; rachis winged nearly 

 throughout, and like the frond, more or less densely clothed with soft shining 

 ferruginous hairs ; lower pinnce rhomboidal-lanceolate, cleft on both sides into 

 simple or bifid lobes, which reach about halfway down to the rachis ; sori 6 to 12, 



