216 CHARACTERS OF TRIBES AND GENERA. 



(v v.) ; L, glabella (A. Cunn.) (v v.) ; L. hirta (Sw.) (v v.) ; 

 L. deparioides (Hook.) (v v.) (Diclisodon, Moore). 



4. VILLOSUM GROUP. 



Fronds tripinnate, 12 to 18 feet long ; stipes {hick, palea- 

 ceous; pinnce 2 to 2 J feet long, lanceolate acuminate, deeply 

 pinnatifid, segments entire or pinnatiftdly lobed; ultimate 

 lobes unisorus. Indusium almost peltate (Megalastrum 

 J. 8m.) 



L. villosa (Sw.) (v v.). 



This is a native of the West Indies and Tropical America, 

 and is described by the collectors, Wilson and Purdie, as 

 having fronds 10 to 18 feet in length ; the height of the 

 stem is, however, not stated. In 1864, two plants in the 

 Kew collection received from Jamaica, were producing fronds 

 5 to 6 feet in length, rising from a thick eaudex, which 

 had every appearance of in time becoming arboroid. 



Although this species technically agrees with Lastrea in 

 venation and character of the sori, the large fronds, and 

 arboroid character of its stems, seems sufficient to warrant 

 its being worthy to be ranked as a distinct genus. 



Sect. 2. Vernation sarmentose. Fronds more or less distant 

 (Thelypteris). 



* Sarmentum hypogeous, naked. 



L. palustris (J. Sm.) (v v.) ; (Thelypteris palustris, Schott. 

 Polypodium Thelypteris, Linn.} L. squamulosa (Schlect.). 



OBS. 'In the " Species Filicum " this is made a synonym 

 of the preceding, but I consider it sufficiently distinct to 

 rank as a species. It is a native of South Africa, while L. 

 palustris is a native of Europe. 



L. Nbveboracensis (Linn.) (v v.). 



