196 



F I L I C E S. 



Plate 27. — Fig. 1. Frond, of the natural size. 1 a. Dorsal view 

 of a portion of a pinna. 1 b. Section of a segment, with a single 

 sorus. 1 c Smaller portion of the same, showing the insertion of the 

 sporangia. 1 d. Scale from the rhachis. 1 e, 1 e. Sporangia. — All 

 more or less magnified. 



* * Frondes bipinnatce; pinnulis pinnatifidis velprofunde serratis. 



9. Lastrea arguta. 



L. stipite parce paleaceo sulcato; frondibus bipinnatis; pinnulis oblongis 

 obtusis apice argute serratis, infimis longioribus subpinnatifidis, laciniis 

 subrotundis mucronato-serratis ; soris biserialibus costce approximates ; 

 indusio rotundato-reniformi sinu prof undo. 



Aspidium argutum, Kaulf. Enum. Fil. p. 242 ; Hook. & Am. Bot. Beech. Voy. p. 

 162 & 405. 



Hab. Oregon and California ; from the Umqua River to Monterey. 



Related to the L. elongata of this work; but with the pinnules 

 usually lobed or pinnatifid, and destitute of the resinous globules 

 which occur on the surface of the pinnules in that species. 



10. Lastrea latifrons, Sp. Nov. 



L. frondibus inferne bipinnatis apice pinnatifidis ynemhranaceis glabris; 

 pinnis sessilibus subalternis adscendentibus, inferioribus pinnatis, supe- 

 rioribus pinnatifidis; pinnxdis oblongo-lanceolatis subfalcatis inciso- 

 lobatis decurrentibus, summis confluentibus, lobis semiroblongis crenatis ; 

 rhachi cum costa infra paleacea supra rufo-pubescente ; soris solitariis 

 fere rnarginalibus ; indusio magno rotundato-reniformi integerrimo. 



Hab. Oahu, Sandwich Islands : on the high mountains behind 

 Honolulu. 



Stipes wanting. Fronds membranaceous, glabrous on both sides, 

 about 18 inches long, cordate-ovate, bipinnate at the base, towards the 



