4 



aa. Margins plain, not spiny-toothed. 

 b. Fronds without hairs. 



c. Fronds lobed or pinnately parted, segments simple, forked, or lobed 



4. H. abruptum, Hook. 



5. H. asplenioides, Sw. 

 cc. Fronds decompound. 



d. Segments flat. 



6. H. paucicarpum, Jenm. (n. sp.) 



7. H. polyanthos, Sw. 



8. M. protrusum. Hook. 



dd. Segments undulate or crispate. 



9. M. clavatum, Sw. 



10. H. undulatum, Sw. 



11. H. axillare, Sw. 



12. J/, crispum, H.B.K. 

 bb. Fronds hairy. 



c. Fronds with margins nearly parallel. 

 d. Rachis winged. 



13. H. lanatum, Fee 



14. H. hirsutum, Sw. 



15. H. clegantissimum, Fee. 



dd. llaehis free or only winged at the top. 



16. H antillense, Jenm. 



17. H. lineare, Sw. 



18. H. sericeum, Sw. 



cc. Fronds oblong or lance-shaped. 

 d. Rachis winged throughout. 



19. II. ciliatuw, Sw. 



20. H. Boryanum, Willd. 



21. H. microcarpum, Desv. 

 dd. Rachis free at the base. 



22. H. hirtellum, Sw. 



23. H. Catherine, Hook. 



1. H. Timbridgense, Smith. 



Fronds narrow with margins more or less parellel, tapering outwards, 1| — 3 in. 1., \ — \ in. w„* 

 twice or thrice-pinnately divided, raiiiis winged, lower pinnae distant with the divisions single or forked, 

 \ — \ li. w., the margins inconspicuously toothed; 



sori small, shortly stalked, inserted just above the pinnae; 



involucres ovate, deeply cleft, the lips indistinctly toothed. 



In forests at 5,000 to 7,000 feet alt. on branches, decaying logs, &c, forming large patches. 



It has a metalic hue in growth, and the texture though delicate is firm and wiry, as in Catherines. 



It is of interest as being a British and very widely spread species. 



2. H. fucoides, Sw. 



Fronds oblong, tapering outwards, twice or thrice pinnately divided, 3 — 7 in. 1., f — 1\ in. w., 

 rachis winged ; pinnse deeply divided, the segments simple or forked, J-l li. w., 2-4 li. 1., slightly 

 hairy on rachis and ribs, margins toothed ; 



sori along each side of the rachis, 1 or 2 on the upper base of each pinna ; 



involucres variable in shape, lips toothed or occasionally plain. 



Frequent in damp forests, near streams, at 5,000-6,000 ft. alt. and very variable. 



3. M. Houstonii, Jenm. 



Fronds 4 — 6 in. 1. 1£ — 2 in. w., thrice pinnately divided, rachis winged, pinnae 1-1^ in. 1 | in. br., 

 cut into divisions forked 1 to 3 times, final divisions \ li. br. 1 — 2 li. 1., margins toothed and slightly 

 crisped. 



Collected only by Sloane, among whose plants it is in the British Museum, p. 140. 



4. H. abruptum, Hook. 



Fronds 1 — 2 in. 1. \ — f in. w., pinnately divided, rachis winged, pale yellowish green, pinnae simple 

 or casually forked, blunt, 1 li w. 



sori large, 1- 3, confined to the top of the abruptly terminated fronds ; involucres partly im- 

 mersed, lips rounded, receptacles protruding. 



Frequent on decaying logs, &c, in forests and coffee plantations at 2,000-3,000 ft. alt. 



Marked by short, simply divided, pale fronds, and few large terminal sori. 



5. H. asplenioides, Sw. 



Fronds pendent, tapering, finger-shaped, or sometimes oblong, 2 — 6 in. 1. \ — 1 in. br., lobed, or 

 pinnately divided with a broadly winged rachis, primary divisions again lobed, becoming simple in the 

 upper part of the frond, final lobes 1 li. w. «nd deep, and mostly bearing the sori at the end ; 



involucres rather compressed, nearly orbicular, attached by the full width of the base, lips rounded, 

 quite plain, enclosing the small sori at the base. 



Common above 4,U00 ft. alt. on tree trunks, forming large and very beautiful patches. 



6. II. paucicarpum, Jenm. (nov. sp.) 



Fronds^- — 3 in. \.,\— 1 in. w. terminating abruptly, thrice-pinnately-divided, rachis wingsd, pinnae 



crowded and overlapping, or in olher cases more or les s opsn, final divisions \ li. w. 



* Throughout this genus the blade only of the frond, excluding the stalk, is referred to in the length given. 



