66 Forty-third Anj^ual Report on the 



The species is allied to L. insulsus, from which it is distinct by its 

 zoneless pileus, tomentose young margin and tardily acrid taste. 

 The stem is without spots and obscurely rugulose-reticulated, as in 

 some species of Russula. The tomentose young margin puts the 

 species among the Tricholomoidei near L. pubescens. 



Lactarius mutabilis, n. sp. 



[Plate 1. Figs. 1 to i.] 



Pileus thin, convex or nearly plane, zonate when moist, reddish- 

 brown, the disk and zones darker, zoneless when dry, flesh colored 

 like the pileus, milk sparse, white, taste mild; lamellae narrow, close, 

 adnate, whitish, with a yellowish or cream-colored tint when old; 

 stem equal or tapering upward, stuffed or spongy within, glabrous, 

 colored like the pileus; spores subglobose, rough, .0003 in. broad. 



Pileus 2 to 4 in. broad; stem 1 to 2 in. long, 3 to 5 lines thick. 



Low, damp places. Selkirk and Yaphank. June and September. 



The species is allied to L. suhdulcis, from which the larger size and 

 zonate pileus separate it. The zones disapjDear in the dry plant, and 

 this change in the marking of the pileus suggests the specific name. 

 They appear to be formed by concentric series of moi'e or less con- 

 fluent spots and are suggestive of such species as L. deliciosus and 



L. subpurpureus. 



Russula brevipes, n. sp. 



[Plate 2. Figs. 5 to 8.] 



Pileus at first convex and umbilicate, then infundibuliform, dry, 

 glabrous or slightly villose on the margin, white, sometimes varied 

 with reddish-brown stains, flesh whitish, taste mild, slowly becoming 

 slightly acrid; lamellse thin, close, adnate or slightly rounded behind, 

 white; stem very short, solid, white; spores globose, verruculose, 

 .0004 to .0005 in. in diameter. 



Pileus 3 to 5 in. broad; stem 6 to 10 lines long, 6 to 10 lines thick. 



Sandy soil in pine woods. Quogue. September. 



This species is related to Bussula delica, but is easily distinguished 

 by its short stem and crowded lamellae. The pileus also is not shining 

 and the taste is tardily somewhat acrid. Fi om Lactarius exsuccus it is 

 separated by the character of the lamellse and the very short stem which 

 is about as broad as it is long. The spores also are larger than in that 

 species. The lamellae in the young plant are sometimes studded with 

 drops of water. They are not clearly decurrent. Some of them are 

 forked at the base. The pileus is but slightly raised above the surface 

 of the ground and is generally soiled by adhering dirt and often 

 marked by rusty or fuscous stains. The plants grew in old roads in 

 the woods where the soil had been trodden and compacted. 



