134 PATAGONIAN EXPEDITIONS: BOTANY. 



F. FRAGILIS (Linn, sub Polypodiuni}. 



Rhizome short, densely leaved, 25 cm. high. Frond ovate-lanceolate, 

 thrice-pinnatifid ; rachis winged above. Ultimate segments rather long, 

 toothed. Sori 2-12 to a pinnule, indusia early withering. 



Fig. in Eng. & Pr. i. 4, p. 163 A-C; Britt. & Br. i. p. 13. 



(In cold climates, and tropical mountains, nearly cosmopolitan) ; Magel- 

 lan ; S. Fuegia ; Falklands. 



POLYPODIUM Linn. 



Fronds articulate on the rhizome, usually all similar, simple or pinnate. 

 Sori round or nearly so, without indusium. Sporesacs with vertical ring, 

 opening transversely. 



Species 350, mostly tropical. 



P. AUSTRALE (Br.) Mett. (Grammitis australis Br.) 



Rhizome short, creeping, scaly. Fronds fasciculate, their 'stipes short, 

 their laminae 15 cm. long, 1.5 cm. broad, spatulate. Sori rather long, 

 near the midnerve. 



(Austral., New Zealand at 1,500 meters elevation; Marion I.; New 

 Caled.; Tristan); Patagonia; W. Magellan, in Desolation I. on stems of 

 trees (Dusen); Fuegia, Camden I. 



P. AUSTRALE NANUM Brack. 



Densely cespitose. Fronds only 10-15 mm - l n g> stipe included. 

 W. Magellan, heights near Packsaddle Anchorage. 



Fam. 5. GLEICHENIACE^E. 



Sori terminal, dorsal, or on the ends of the veins, small, of few sessile 

 or subsessile sporesacs, and with no indusium. Ring transverse, com- 

 plete ; sporesacs opening by vertical slits. Veins free. 



Species 26, tropical, and southern. 



GLEICHENIA Smith. 



Rhizome creeping. Leaves usually spreading, veins forked. 

 Species 25. 



