102 Twenty-third Report on the State Cabinet. 



A small form occurs with the pileus nearly white, scarcely 

 half an inch in diameter, and the cuticle not cracking. 



106. Agaricus campa:xulatus L. 



Pileus oval campanulate or obtusely conical, sometimes 

 umbonate, smooth, somewhat shining, brownish, with a pecu- 

 liar gray or lead-colored tint, sometimes becoming reddish 

 tinted, the margin often scolloped or fringed with the appen- 

 diculate veil ; lamellae not broad, attached, becoming grayish- 

 black ; stipe long, slender, hollow, reddish, pruinose and 

 slightly striate at the top, at length dusted with the spores. 



Height 4-6', breadth of pileus 6"- 12". 



On horse dung and rich soil. June and July. Common. 



In very wet weather the cuticle of the pileus sometimes 

 cracks into scales or areas. 



Subgenus — Psathyrella. 



Veil not interwoven ; pileus membranaceous, margin not 

 reaching beyond the gills. — BerA\ Outl. 



The species in this subgenus are more fragile than those in 

 the preceding, the pileus tliinner, often hygroj)hanous and stri- 

 atulate, and the gills extend to its margin. 



Synopsis of the Species. 



Pileus hygrophanous, smool h a. 



a. Pileus couical 106. 



a. Pileus obtusely campauulate 107. 



Pileus sulcate-striate, not hygrophauous 108. 



106. Agaricus gracilis Fr. 



Pileus submembranaceous, conical, smooth, hygrophanous, 

 watery-brown and striatulate when moist, yellowish or cream- 

 colored when dry ; lamellse broad, not close, attached, becom- 

 ing grayish-black ; stipe slender, straight, smooth, hollow, 

 whitish. 



Height 4-6', breadth of pileus 9"- 12". 



Rich grassy ground. Knowersville. September. 



The straight tall stem and regular conical pileus make this 

 a beautiful species. The margin of the pileus lirst begins to 

 decay. 



107. Agaricus atomatus Fr. 



Pileus membranaceous, siibcampanulate, obtuse, smooth 

 hygro])hanous, brownish, tiiigt'd with pink or ochre and 

 striatulate when moist, paler and with sparkling atoms wli(>n 



