304 BOTANY. 



varies a good deal iu outline, and in (he shape of the segments, which are either obtuse or acute, entire 

 or serrated. Plants found very near the sea have a somewhat thicker texture, more regularly anastomos- 

 ing veinlets, and more elliptical fruit-dots, and correspond more closely with the character given by 

 Kaulfuss. I was at one time disposed to think P. Californicum and P. intermedium distinct species, but 

 on maturer Btudy adopt the view of Hooker and Baker, that they are but one. 



Polypodium Scouleri, Hooker & Greville. 



Rootstock creeping, scaly; stalks pale-brown, stout; fronds very thick 

 and coriaceous, fleshy when recent, broadly ovate, pinnatifid to the midrib; 

 segments linear-oblong, obtuse, obscurely serrulate, the terminal one dis- 

 tinct and often the longest ; veinlets anastomosing regularly and forming a 

 single series of large areoles ; fruit-dots very large, borne near the costule 

 on the upper segments only, or towards the ends of the middle segments 

 also. — Icon. Fil. t. 56. P. carnosum, Kellogg, Proc. Cal. Acad, ii, p. 88, 

 fig. 24. P. pachyphyttum,'D. C. Eaton in Amer. Jour. Sci. July, 1856, 

 p. 138. 



On trees and stumps, more rarely on the ground, from Guadalupe Island (Dr. Palmer) to the 

 neighborhood of Mount Shasta and Crescent City (Prof. Brewer), and northward to British Columbia. 

 By far the finest of all our Polypodia ; the fronds sometimes stand over 2 feet high, fleshy, evergreen, 

 and with the fruit-dots (or sori) one-fifth of an inch in diameter. When the chaff has fallen from the 

 rootstocks, they are seen to be glaucous-white and finely rugose. Gen. A. V. Kautz (then a lieutenant) 

 noticed it growing on Firs at Port Orford, Oregon, in 1855, at the height of 150 to 200 feet above the 

 ground. It was originally described from very small specimens with 5-9 segments, bnt Prof. Brewer 

 collected it with as many as 27 and 29. 



H. GYMNOGRAMME. Desv. 



Sori (fruit-dots) oblong or linear, following the course of the veinlets, 

 and, like them, either simple, forked, pinnated, or variously anastomosing, 

 without indusium. — A large and not very natural genus, the species with 

 fronds mostly of moderate size, and of nearly every possible shape, many 

 with a hairy or tomentose surface, and some with a very beautiful white or 

 yellow powdery coating to the under surface! Only two species are known 

 to occur in the United States. 



Gymnogranune triangularis, Kaulfuss. 



Stalks densely tufted, slender, blackish-brown, polished, 6-8 inches 

 long; fronds deltoid or 5-angled, 2-5 inches long and nearly as broad, pin- 

 nate, the lower pair of pinna? much the largest, triangular, bipinnatifid, the 

 rest oblong or lanceolate, more or less pinnately lobed or incised; segments 

 obtuse, crenated: lower surface coated with a yellow or white powder, upper 



