171 223 



Nephrodium dissidens Hk. sp. 4: 66. 1862. Hk. Bak. Syn. 295. 



Dryopleris dissidens O. Ktze. Rev. 3: 812. 1891 ; Urban, Symb. Anl. 4 : 19. 1903. 



Nephrodium jamaicense Bak.; Jenm. Journ. Bol. 1877: 264. Bull. Dept. 

 Jam. n. s. 3: 163. 1896. 



Dryopteris jamaicensis C. Chr. Index 272. 1905. 



Nephrodium asplenioides Bak. Syn. 293 (part?). 



Aspidium Sintenisii Kuhn et Christ.; Krug, Engl. Jahrb. 24: 119. 1897. 



Dryopteris Sintenisii Urban, Symb. Ant. 4: 19. 1903; C. Chr. Ind. 293. 

 Type from Cu ba leg. Poeppig (specim. auth. vidi in Herb. Berol. et Herb. Presl). 

 A distinct but very misunderstood species, by Mettenius considered the most 

 developed form of his A. scotopendrioides, while Baker (Syn. Fil. 293) very im- 

 properly referred it to his Nephrodium asplenioides. As the above list of synonyms 

 shows, the species has been described under at least three new names, of which 

 A. dissidens was placed in Syn. Fil. under the subgenus Pleocnemia (!). It is beyond 

 question that the forms referred by me to Ü. sclerophylla are closely related when 

 not absolutely identical. The main-characters of the species are 1) the coriaceous 

 or papyraceous texture of the lamina, which is of a characteristic grey colour due 

 to the dense pubescence of stellate hairs throughout both surfaces, 2) the thick, 

 undulato-crenate margins of the teeth or lobes, which generally seem to be acute 

 or even mucronate because the margins of the lobes are revolute, 3) the prominent 

 veins, 4) the supramedial or even submarginal sori, and 5) the glabrous sporangia. 

 The erect or oblique rhizome is at the top densely clothed with red-brown 

 or nearly black, glossy, stellato-pilose scales. The lamina varies in size and degree 

 of cutting but it is always fully pinnate from base to the middle. The basal pair 

 of veins is always truly anastomosing. Sori with a distinct, stellato-pubescent in- 

 dusium. I can distinguish two forms. 



1. (typical scleropliylla). Leaves on short stems, long and gradually narrowed 

 below. Pinnæ short (3 cm x Si cm) the lower ones gradually smaller almost as in 

 D. opposita, the fully developed ones sessile with a subcordate base, the upper ones 

 confluent all broadly serrate, scarcely pinnatifid. Veins simple; sori medial. Scales 

 of rhizome few, brown. 



Cuba: Poeppig (B, hb. Pkesl) — Prov. Habana, Baker and O'Donavan nr. 4135 (W); Bakeh nr. 1888 

 (W) — Prov. Pinar del Rio, Palmer and Riley nr. 230, 227, 391, 533 (W); Baker nr. 3797 

 (W) — V Hermann nr. 2185, 3256 {W| — Prov. Oriente, Wright nr. 1005 (B, S), 3923 (B, W, S) 

 Maxon nr. 4447 |\V) — Prov. Santiago, Pollard and E. and W. Palmer nr. 41 (W). 



2. Leaves on longer stems, ovale or elliptic, shortly narrowed downwards. 

 Pinnæ short-stalked or sessile with cordate base, up to 8 cm long, l''/i— 2 cm broad, 

 pinnatifid to a narrow wing to the costa. Veins pinnate in the lobes, often furcate 

 and forming costular aréoles, very prominent beneath. Sori supramedial or sub- 

 marginal. Scales of rhizome nearly black, 2 cm long, glossy. 



Cuba: Prov. Habana, Wilson nr. 671 (W), Curtiss nr. 592 (H,W|,— Prov. Pinar del Rîo.Palmer and Riley 

 nr. 12Ü, 223, 567 (W) - Prov. Oriente, Wright nr. 10(11 pt. (S, W). Maxon nr. 4389, 4422 (W), 

 Eggers nr. 4941 (Bj. 



29* 



