236 184 



235. Dryopteris riograndensis (Lindm.) C. Chr. Ind. 289. 1905. 



Syn. Polijpodhim riograndense Lindni. Ark. for Bot. 1: 230 tab. 3 ug. Ci. 1903. 

 Aspidium refractum Hieron. Engl. Jahrb. 'Z'Z: 374. 1906 (non A Br). 

 Nephrodium refractum auctt. plur. quoad pi. brasil. 

 Dryopteris réfracta Ros. Hedwigia U\: 131. 1907. 



Type from Brazil: Minas Geraes, Caidas, leg. Mosen nr. 2170 (S! Rg). 



A very uniform, small species, which unrightly has been identified with Aspi- 

 dium refractum A. Br. It is however certainly a near ally of J), scabra, from which 

 it differs by the pinnæ being serrate only and the low^er pair of veins being con- 

 stantly anastomosing. The rachis is above rather densely stellato-puberulous, 

 otherwise the leaf is almost quite glabrous; sometimes the costæ beneath bear 

 some white hairs. The rhizome is decumbent or shortly creeping, a little scaly. 

 Stipes 1 — 2 dem long, stramineous like the rachis and costæ. Lamina 12 — 20 cm 

 long, scarcely narrowed downwards, rather suddenly narrowed into a pinnatifid 

 apex upwards. Pinnæ all sessile, opposite, 5 — 7 cm long, 1 cm broad, dark-green, 

 herbaceous, the margins only serrate, rarely subentire or lobed. Veins about 3 to 

 a side, the basal ones united or running side by side to the sinus. Sori medial, 

 exindusiate. Sporangia glabrous. — The rachis is often gemmiferous. 



Evidently a common species in South Brazil and adjacent countries. I have 

 the following specimens: 



Brazil: Minas Geraes, Caldas, Moskn nr. 2170, 4636 (Rg) - Sla. Catharina. Pabst nr. 798 (B) — 

 Hio Grande do Sul: Piratiiiy, Lindman nr, A. 865 (Rg); Cachoeira, Malme nr. 984 (Rg); 

 LiNDMAN nr. 1167 a; Sllveira Martins, Lindman nr. 1167 b (Rg). Further the specimens 



quoted by Rosenstock loc. cit. and distributed by him as Nephrodium refractum, Fil. austr. 

 bras. e.\s. nr. 84 and 250 (B, C, Rg, W). 



Uruguay: l^uerto del tanze, Berro nr. 1260 ;C) — Isla San Gabriel, Berko nr. 2367 (C, CC). 



Argentina: Misiones, Bonpland, Ekman nr. 8 (Rg, S) — Entrerios, Arroyo Yucharichico, Lorentz nr. 7i)7 (B). 



Paraguay: Coaguzu, Balansa nr. 310 (CCl. 



236. Dryopteris scabra (Presl) C. Chr. Biolog. Arbejder tilegn. Eng Warming 



84. 1911 — Fig. 32. 



Syn. Polypodium scabrum Presl, Del. Prag. 1: 169. 1822. 

 Lastrea scabra Presl, Epim. hot. 41. 1849. 

 Polypodium tetragonnm auctt. quoad plant, austro-brasil. 

 Nephrodium telragonum auctt. quoad plant, brasil. (Bak. Fil. bras.; 



Syn. Fil. etc.). 

 Dryopteris pseudotetragona Rosenst. Hedw. 46: 119. 1907. 

 Type from Brazil, ad Mathias Ramos, leg. Pohl (hb. Presl!). 

 Rhizome oreeping, clothed at the apex with brown, stellato-pilose scales. 

 Stipe greyish-yellow, bisulcate, shortly pubescent, 20 cm long. Lamina ovato-lan- 

 ceolate, 20—25 cm long, 15 cm broad, dark-green, firmly herbaceous, upwards rather 

 suddenly narrowed into a pinnatifid apex and generally proliferous at the base of 

 the upper pinnæ. Rachis slender, rather densely and shortly hairy by simple and 

 stellate hairs, which latter mostly occur on the upperside of the upper part of the 



