Jan. 1907] North American Species of Lepiota 5 



69. LEPIOTA FRAGILISSIMA, Hiatula fragilissima 

 Ravenel, in Berkley's Centuries of N. A. Fungi, Ann. & 

 Mag. N. H. 1853. 



Pileus membranaceous, very thin and fragile, ovoid then cam- 

 panulate and explanate, subumbonate ; the dermis radiately fibril- 

 lose, white beneath a yellow pulverulence, plicate-sulcate and 

 rimtilose. vStipe arising from a somewhat bulbous base, slender, 

 elongated, fistulous, fibrous-stuffed, very fragile, yellow, with a 

 white mycelium at the base ; the annulus movable. Lamellae 

 white, thin and membranaceous, rather distant, obtuse behind and 

 remote from the stipe ; spores obliquely elliptic, rather large. 



Solitary or gregarious ; growing on earth and decayed veget- 

 ables on the margin of swamps. S. Carolina, Ravenel. Pileus 

 5-8 cm. in diameter, the stipe 10-15 cm. in height. 



70. LEPIOTA SULPHURINA, Mastocephalus sul- 

 phurinus Clements, Bot. Neb. IV, 1896. 



Pileus submembranaceous, campanulate then convex, um- 

 bonate ; the dermis radiately fibrillose, sulphur-yellow, torn into 

 crowded, oblong or elongate scales, plicate-sulcate around the 

 margin ; the umbo glabrous, incarnate-brick-colored. Stipe aris- 

 ing from a bulbous base, tapering upward, fistulous, pruinose, 

 at the base yellow-floccose, isabelline above ; the annulus mem- 

 branaceous, sulphur-yellow, lacerate. Lamellae linear, crowded, 

 adnexed. white or pale straw-colored ; spores elliptic-ovoid, 7-9 x 

 4-5 mic. uniguttulate. 



Growing on the ground. Nebraska, Clements. Pileus 1.5-3 

 cm. in diameter ; the stipe 4 cm. long, 3-4 mm. thick above, 6-y 

 mm. below. 



71. LEPIOTA FLAVESCENS Morgan sp. nov. 



Pileus submembranaceous, ovoid then campanulate and ex- 

 planate, subumbonate ; the dermis radiately fibrillose, becoming 

 scaly, sulcate nearly to the center ; pale yellow, fulvescent on 

 the umbo. Stipe tapering upward, slender, fistulous, rufescent be- 

 neath the white-fibrillose cuticle ; the annulus thin, membranace- 

 ous, yellowish, persistent. Lamellae narrow, subdistant, free, 

 white or yellowish ; spores elliptic-oblong, obliquely apiculate 5"6 

 x 3-4 mic. uniguttulate. 



Growing on the ground under Robinia and Gleditsia trees. 

 Preston, O. Pileus 2-4 cm. in diameter, the stipe 3-5 cm. long 

 and 2-4 mm. thick. Apparently related to such species as Lepi- 

 ota sulphurella K. & C. and L. citrinella Speg. 



