[Vol. 9 

 190 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



/. paupercula (Engelm.) Eaton. Proc. U. S. Nat. Mus. 23: 

 649. 1901, and in Gilbert, List N. Am. Pterid. 10: 28. 1901. 



Conn 2-lobed; leaves commonly 9-30, rarely 60, 5-20 cm. long, 

 dark green, rigid, gradually tapering, with wide membranaceous 

 border at base, extending 2-3 times length of sporangium above 



of 



ands and stoniata lacking;* ligule 



th 



about 1/3 of 



cream-colored, 525-640 n in diameter, marked with low con- 

 spicuous irregular crests, chiefly simple on the apical faces, 

 branching to form irregular network on basal face; microspores 

 24-42 n long, spinulose. 



Distribution: Idaho, Wyoming, Colorado, California. 



Specimens examined: 



Idaho: in water from 6 in. to 6 ft. deep. Lake Coeur d'Alene, 22 



August, ]Ni>7, Henderson 2979 (Mo. Bot. Gard. Herb.); in 

 2 ft. of water, Lake Coeur d'Alene, August, 1898, Hender- 

 son (Mo. Bot. Gard. Herb.); in 2 ft. of water, Lake Coeur 

 d'Alene, August-September, 1897, Henderson 1+786 (Gray 

 Herb.). 



Wyoming: Yellowstone Park, 1885, Tweedy 416 (U. S. Nat. 



Herb, and Grav Herb.) : crowing in deep water at north end 



of Yellowst 



Gard. Herb 



(N. Y 



Colorado: "covering the bottom of Grand Lake in granitic sand 



'A-4 ft. under the surface of water, abundant, meadow-like 

 Middle Park." 5 Ausust. 1881. Enoelmann (Mo. Bot. Gard 



Herb.). 



California: Donner Lake, September, 1887, Curran (Mo. Bot. 



Gard. Herb, and N. Y. Bot. Gard. Herb.); Donner 1 Lake, 

 Shockley (Mo. Bot. Gard. Herb.) ; Castle Lake, mountains 

 about the headwaters of the Sacramento River, alt. 6C00 ft., 

 1 1 August, 1881, Pringle (Mo. Bot. Gard. Herb, and Gray 

 Herb.). 



53. I. Piperi Eaton, Fern Bull. 13: 51. 1905; name only in Fen 

 Bull. 11: 85. 1903; Piper, Contr. U. S. Nat. Herb. 11: 89 

 1906. 



/. Occident alis var. Piperi (Eaton) Nelson & MacBride, Bot 

 Gaz. 61 : 30. 1916. 



