C. Christensen: Dryopteris species et varietates novae. 



25 



minimis; medialibus maximis, horizontalibus, acuminatis, c. 4 cm longis, 

 7—8 mm latis, fere ad costam pectinato-pinnatifidis. Segmentis c. 

 15-jugis, patentibus vel parum obliquis, sinubus latis, rotundis separatis, 

 marginibus integris revolutis, apice subacutis; basalibus longioribus, 

 posteriore auriculo rotundato rachin tegente instructo. Venis distantibus, 

 4— 5-jugis, simplicibus, crassis, in pagina superiore scalpturato-elevatis. 

 Soris parvis, submarginalibus, plerumque a margine revoluto tectis^ 

 exindusiatis. Sporangiis nudis. 



Hab. in S to. Domingo prope Constanza ad Valle nuevo, in rupibus, 

 alt. 2270 m: Eggers no. 2157, 29. Mai 1887. 



Species nova habitu et magnitudine D. oppositae (Vahl) Urban similis, 

 differt: textura valde coriacea, lamina glabra, eglandulosa, venis crassis, 

 superne elevatis, segmentis angustioribus. Textura, venatione D, sccd- 

 pturoidi (Fée) C. Chr. magis affinis, a qua specie differt: soris exindusiatis, 

 lamina glaberrima, pinnis angustioribus. 



2. Dryopteris sancta (L.) 0. Ktze. 



Conf. C. Chr. Vid. Selsk. Skr. VII, 4, 295-297; Smiths. Misc. Coll. 52, 

 378—380. 



In Santo Domingo this species is very variable. I can distinguish 

 the following varieties, which, however, are connected by intermediate 

 forms. 



1. typica C. Chr. Smiths. Misc. Coll. 52, 379. — Small, bipinnatifid, 

 exindusiate, generally glabrous, sometimes hairy on the ribs (var. strigosa 

 C. Chr. 1. c.) or finely pubescent on the upperside (var. hirta Jenm.). 

 Underside with large red glands. 



Eggers no. 2512 b, 2512 (approaching var. Balbisii); Pic arda no. 312, 

 606, 685, 1180. — Barrabas: Raunkiaer no. 1905 (Herb. C. Chr.). Rio 

 Mameyes: Eggers no. 2780 (U. S. Nat. Herb., not this no. in Herb. Krug 

 et Urban). 



f. strigosa C. Chr.: Ricarda no. 727. 



2. var. Balbisii (Spr.) C. Chr. Vid. Selsk. Skr. VII, 4, 296 f. 20. — 

 Large; largest pinnae mostly equal-sided, pinnate, with linear pinnulae or 

 segments, which are toothed or crenate, the basal ones often deeply 

 lobed. Underside glandulose, glabrous or slightly strigose on the ribs. 

 Sori exindusiate (?). 



Eggers no. 2540, 2540b, 2780 (in Herb. Krug et Urban, not in U. 

 S. Nat. Herb.); Weinland no. 56; J. N. Rose etc. no. 4386; Ber- 

 tero no. 796; Prenleloup (Herb. Christ); Marmelade: Nash et Taylor 

 no. 1229 (U. S. Nat. Herb.). 



Obs. The identification of this form to Polypodium Balbisii Spr. is 

 due to Prof. Hieronymus, while Sprengel himself (Syst. IV. 1 

 p. 101) referred his plant to D. Sprengeiii and also Kuhn (in Engl. 

 Jahrb. XXIV, p. 116). I have now seen a fragment of Sprengels specimen 

 (Bertero no. 796) and can ascertain Hieronymus' opinion. 



