160 Thirty-fifth Report on the State Museum. 



wounded. The striations of the margin vary in diflfereut plants, being 

 sometimes distinct, sometimes obscure. 



I have placed this species in the tribe Annulosi because of its rela- 

 tion to A. cepmstipes. It has also a close relation to the Proceri and 

 might with almost equal propriety be placed among them. The an- 

 nulus both in this and the next species occasionally loosens from the 

 stem and becomes a movable ring. 



Agaricus naucinoides, Pk. 

 Smooth Agaric. 



Pileus at first subglobose, then convex, fleshy, soft, smooth, rarely 

 slightly squamulose or granular-mealy, white or smoky-white, flesh 

 white ; lamellfe rather broad, close, free, white, slotoly changing to a 

 (Imgy pinJcish-bro2vn or smoky-brown color with age or in drying; stem 

 smooth or silky-fibrillose, equal or slightly thickened at the base, hol- 

 low, sometimes stufi"ed with webby filaments, white or smoky-white, 

 annulus thick, persistent, white ; spores subelliptical, uninucleate, 

 .0003' — .0004' long, .0002' — .0003' broad. 



Plants' — 4' high; pileus 1.5' — 3. 5' broad; stem 3" — 5" thick. 



Grassy grounds in pastures, fields and roadsides. Common. Sep- 

 tember — November. 



This is a beautiful as well as a useful Agaric. It is very regular and 

 symmetrical in shape and generally pure white in color. Its surface 

 is usually very smooth and even, though occasionally a slight meali- 

 ness or granular roughness is developed on the disk and still more 

 rarely a few minute scales appear. In a single instance I have seen the 

 surface cracked into rather large thick scales, a result probably of un- 

 usually wet weather. The white color sometimes gives place to a dingy 

 smoky-white or ashy hue. The lamellae are at first white or cream- 

 colored, but when old or dried they become smoky-brown or brown- 

 ish tinged with pink. The stem is hollow, but, as in many other 

 JioUow-stemmed Lepiotae, the cavity often contains webby or cottony 

 filaments, especially when young. The plant occurs late in the season 

 and is most often found in grassy pastures and in lawns, though 

 sometimes it occurs in cornfields and other cultivated grounds. It is 

 liable to be confused with white forms of the common edible mush- 

 room, A. campestris, but in that species the lamellae at first have a 

 beautiful pink or flesh-colored hue which soon changes to a blackish- 

 brown color. It also bears some resemblance to A. Imvis and to A. 

 cretaceus, but the former has flesh-colored and the latter brown spores. 

 It is, however, more nearly related to its wliite-spored allies. 



