!8 PATAGONIAN EXPEDITIONS I BOTANY. 



farinaceous ; indusium semiorbicular, scarious at the margin, underneath 

 sulphureo-farinose ; sporangium rotundate. 



PTERIS L. 



P. SEMIADNATA Phil, in Linnaea, 29 (1857), p. 106. 

 W. Patagonia, its northernmost section, in the district of evergreen 

 forest; S. Chili. 



POLYPODIUM L. 



Polypodium australe (R. Br.) Mett. is by C. Chr. Ind. Fil., p. 513, 

 replaced by P. Billiardierii (Willd.) C. Chr. 



To this species are to be added the following varieties : 



Var. MAGELLANICUM (Desv.) C. Chr., Some Ferns, p. 15. 



Syn. Grammitis magellanica Desv. 

 W. Patagonia, Otway by Puerto Toro. 



Subvar. NANUM (Brack.) Franch. Miss. Cap. Horn, V, p. 397. 



Syn. Grammitis nana Owack. U. S. Expl. Exp., 16, p. i ; Polypodium 



australe nanum Brack. Macl., p. 134. 



S. Fuegia, also by Lago Cami in the alpine region; supposed by 

 Christiansen to be an alpine form of var. magellanicum. 



P. PATAGONICUM C. Chr., Some Ferns, p. 15. 

 W. Patagonia, Rio Aysen. 



P. TRILOBUM Cav. 

 Add Macl., p. 134: 



Syn. P. Synammia (Fe) C. Chr. 



Rhizoma crassa, squamis scariosis, angustis, imbricatis vestitum ; stipes 

 glaber, subcomplanatus, ad i dm. usque longus, uno latere canaliculatus ; 

 frons ovalis vel subrhomboidea, coriacea, glabra, pinnata, pinnis 2-13 

 oppositis vel suboppositis, discoloribus, lineari-lanceolatis, subacutis, decur- 

 rentibus, subhorizontalibus vel oblique dispositis, marginibus cartilagineis, 

 irregulariter et remote crenulatis, summa interdum trilobata vel rare bilo- 

 bata ; sori crasse oblongi ; spori ovati, glabri. 



N. W. Patagonia, Rio Manso ; Central and South Chili ; Rio Palena. 



