160 108 



Gymnogramme microcarpon Fée, 7 mém. 43 tab. 20 fig. 5. 1857. 



Polypodium velatinum Sod. Rec. 59. 1883; Cr. vase. quit. 292. 1893! 



Polypodium Percivalii Jenm. ; Bak. Ann. of Bot. 5: 456, 1891! 



Dryopteris Percivalii C. Chr. Ind. 284. 1905. 

 Linnaeus founded this well-known species on "Petiv. fil. 61 t. 2 f. 5", a work 

 to which I have no access, but all later authors quote also Plumier tab. 24, which 

 plate illustrates a plant from Martinique and which is our species. 



A very large species with fronds up to 3' /a ni long and pinnæ 30—45 cm 

 long by 4 cm broad. Stipe strong, generally muricate, scaly below and like the 

 rachis downy by short, simple, deciduous hairs; in some (or all?) specimens the 

 stipe bears some long, projecting aërophores. Margins and costæ above densely 

 hairy by long, soft hairs, costæ and costulæ beneath slightly and shortly pubescent 

 becoming glabrous; under-surface covered with red, sessile, deciduous glands. 

 Pinnæ sessile, linear with nearly parallel edges, the aërophore at base thorn-like, 

 1 cm long. Segments patent, 2 cm long, 3 -4 mm broad with an obliquely 

 rounded apex, i. e. the posterior side being bluntly rounded, the anterior one 

 forming about a right angle with the anterior edge, a threadlike aërophore, 2—3 

 mm long, is found at the base of the costules beneath; basal segments generally 

 somewhat reduced. Veins 25— 40-jugate, very close. Sori inframedial or siibcostu- 

 lar, exindusiate: receptacles somewhat elevated, oblong; sporangia glabrous, red- 

 dish, loose. 



The form described here is the typical one, to which belong the following 

 specimens: 



West-Indian Islands: Martinique, Isert (H); Sieber nr. 189, 349 (B ^ P. grammicum Spr.); 

 L. Hahn nr. 41 (B) — Guadeloupe, LHebminier nr. 173 (B, C); Lenormand (B); Duchas- 

 SAiNG (B) — Montserrat, Ryan (H) — Dominica, Eggers nr. 629 (B); F. E. Lloyd nr. 

 349 (W) - St. Vincent, Eggers nr. C805 (W) ; H. H. & G. W. Smith nr. 43 (W) — 

 Grenada, Eggers nr. 6388 (C, W); Broadway (W) — Porto Rico, Sintenis nr. 1787 

 (C), 4592 (B, W) — Jamaica, H. Smith nr. 436 (B); Hart nr. 195 (W); Clute nr. 163 

 (W); A. Fredholm nr. 3343 (W); Underwood nr. 1361 (W). 



Guiana, Leprieur (B, Wi — Mt. Russell, Pomeroon River, Demarara, Jenman nr. 2080 (Kew ^ 

 P. Percivalii Jenm.), 



Venezuela, Funck nr. 771 (B); Karsten nr. 166 (Bj. 



Costa Rica, La Palma, Maxon nr. 443 (W); Wercklé (C, CC). 



Most And! ne specimens differ from the type by the more densely pubescent 

 rachis and costæ, more remote and more acute segments and apparently fewer 

 glands on the underside. 



A specimen from Sodiro, named by himself P. velutinum Sod. belongs to 

 this form, which I therefore call 



f. velutina (Sod.) 



Ecuador, Sodiro (C) — Peru: San Gavan, Lechler nr. 2356 (B). 



Costa Rica: La Palma, Tonduz nr. 12639 (C, W) ~ Carillo, Pittier et Tonduz nr. 1165 (C). 



