200 



F I L I C E S. 



Stipe about 15 inches long, as thick as a crowquill, naked and 

 sulcate in front, with a few narrow scales at the base. Fronds of a 

 lively green colour, from 12 to 15 inches long, broad-ovate, acumi- 

 nate, somewhat cordate at the base, where they are tripinnate, bipin- 

 nate about the middle. Pinnae alternate, petiolate, oblong-lanceolate, 

 and tapering rather gradually into a finely serrate point. Pinnules 

 petiolate, somewhat rhomboidal-oblong, acute, incisely-serrate, the in- 

 ferior ones pinnatifid, beset with very minute, appressed, glandular 

 hairs on both surfaces. Rhachis on the upper side almost concealed 

 by a brownish pubescence. Sori rather large when contrasted with 

 the narrow divisions of the fronds, with a flat round-reniform indu- 

 sium, having a deep sinus at the point of attachment. 



16. Lastrea uEmula. 



Aspiclium cemulum, Sw. Syn. Fil. p. 60; Willd. Spec. PI. 5, p. 283. 

 Polystichum cemulum, Presl, Tent. Pterid. p. 83. 



Hab. Pico Ruivo, island of Madeira. 



Presl places this in his genus Polystichum, the species of which 

 have an orbicular and peltate indusium. But in our plant, which we 

 take for the true A. cemulum of Swartz, we find the indusium to be 

 reniform, and the consistence of its fronds also agrees with other true 

 species of Lastrea, to which genus we therefore refer it. 



17. Lastrea glabra, Sp. Nov. 



L. stipite gracili parce paleaceo; frondibus membranaceis glabris triple 

 natis; pinnis primariis subaliernis; pinnulis rhomboideo-oblongis 

 obtusis inciso-lobatis, infimis profunde pinnatifidw, lobis semi-oblongis 

 spinuloso-serratis ; sorts parvis submarginalibus ; indusio rotundato- 

 reniformi integerrimo. 



Hab. Sandwich Islands: in elevated forest lands of Hawaii and 

 Oahu. 



Fronds membranaceous, smooth on both sides, tripimmte, triangular- 



