396 BOTANY, 



ingly many-jointed, and their persistent bases remain on the rootstock several 

 years. Plate XL. Fig. 17. Plant; natural size. Fig. 18. Sporangia, in 

 position; magnified twelve diameters. Fig. 19. A sporangium; magnified 

 forty diameters. Fig. 20. A sterile frond. (1,361.) 



Pell^a densa, Hook. S^. Fil. 2. 150. {OnycUum densum, Brackenr. 

 Bot. of Wilkes's Exp., Ferns, p. 120, t. 13.) Rootstock short, scaly with 

 blackish chaiF; stalks clustered, polished, dark-brown, 4-10' long, very 

 slender and much longer than the ovate densely tripinnate frond ; pinnules 

 linear-oblong, acute, much crowded^ 3-5" long, membrainaceous or somewhat 

 coriaceous ; sterile ones denticulate, fertile ones with the proper margin re- 

 curved and bordered with a narrow involucre. — Rogue's River and Fort Or- 

 ford, Oregon, to the Yosemite. Rocky gorge above Cottonwood Caflon in the 

 Wahsatch; 7,000 feet altitude. (1,362.) 



Ceyptogeamme aceostichoides, R. Brown. {Allosorus acrostichoides, 

 Sprengel.) Arctic America and Alaska to California, and eastward to Lake 

 Superior. In the Clover Mountains, Nevada, and in the Wahsatch and Uin- 

 tas; 9-10,000 feet altitude. (1,363.) 



AsPLENiUM Filix-fcemesta, Bcrnh. Throughout Europe and much of ' 

 Asia and Africa. America from Alaska and Labrador to Venezuela. In the 

 East Humboldt Mountains, Nevada ; 6-7,000 feet altitude ; a form with am- 

 ple fronds of delicate texture, 2^-3J° high. (1,364.) 



Var. MiCHAUxii, Mettenius. Fil. Hort. Lips., p. 79. {A. angustum, 

 Willd.) Fronds somewhat rigid and much narrower in outline, bipinnate ; 

 pinnae narrowly lanceolate, usually diverging from the rachis at an acute angle 

 or curved upward ; pinnules serrated or slightly lobed ; fruit-dots short ; indu- 

 sium straight or recurved. — Common from Maine to Lake Superior Califor- 

 nia, (Brewer.) Rocky side-gorge above Cottonwood Caflon in the Wahsatch ; 

 7,000 feet altitude. (1,365.) 



AspiDiUM LoNCHiTis, Swartz. Throughout Europe and in the Hima- 

 layas. Greenland and Arctic America to Canada and Lake Superior, and 

 westward to Alaska and Oregon. Same locality with the last ; 8-9,000 feet 

 altitude. (1,366.) 



Cystopteeis peagilis, Bernh. From Iceland to Tasmania, and from 

 Japan westward to the Sandwich Islands. Grreenland, Arctic America, 

 Alaska and Labrador to Chili. In the Washoe, West Humboldt and East 

 Humboldt Mountains, Nevada, and in the Wahsatch and Uintas; 6-9,000 



