MACLOSKIE : PTERIDOPHYTA, FERNS AND FERNLIKE PLANTS. 13! 



H. TORTUOSUM Banks & Sol. 



15 cm. Stipe and rachis winged. Frond crisped, thrice-pinnatifid. 

 Ultimate segments linear, toothed and wavy. Sori numerous, terminal 

 on the segments. 



Chonos Archip., Fuegia throughout; S. Patagonia (by Hatcher). 



Fam. 3. CYATHEACE^;. 



Mostly tree-ferns with large compound fronds. Sessile or stalked 

 sporesacs, with complete ring, obovoid and crowded on a convex recep- 

 tacle, opening by a transverse slit. 



Chiefly tropical ; also in colder parts of S. Amer. and in Tasmania and 

 New Zealand. 



ALSOPHILA R. Br. 



Sori globose, dorsal on a vein or the forking of a vein, mostly hairy. 

 Indusium none. 



Species 150, S. America; Africa; Pacific Is. 



A. PRUINATA Kaulf. 



Thrice-pinnate ; pinnae 40 cm. long, hoary, white underneath. Leaf- 

 stalks woolly. Sori solitary near the chief nerves, one or more to each 

 lobule. 



Mex. and W. Indies; S. Amer. (Fig. in Eng. & Pr. i. 4. p. 133. C.) 

 Patagonia, Otway (Savatier). " Not previously observed south of Juan 

 Fernandez I. Its occurrence in Patagonia is a very interesting fact" (A. 

 Franchet). 



Fam. 4. PoLYPODIACEjE. 



Ferns of varying habit, coiled in vernation. Sporesacs mostly with 

 incomplete vertical rings, opening transversely; stalked; their clusters 

 (sori) on the underside of the fronds, or on contracted fronds ; mostly 

 with an indusium. 



Species about 3000, cosmopolitan. 



BLECHNUM Linn. 



Sori in continuous lines, not marginal, one on each side of the midrib, 

 with a continuous indusium, which opens towards the midrib. Veins 

 forked. 



