EDIBLE FUNGI 121 



ward through the gills, making the structurally entire margin 

 cuspidate-dentate. The disk is brown, subumbonate, or in age 

 concave. The gills number about sixty, are 3 millimeters deep, 

 adnate to a narrow collar, and black or pale after the spores 

 are cast. The spores are obtuse, thickest toward the base, 

 black, and measure 20 to 22 by 11 to 12 microns. The basidia 

 are 30 microns high, disposed regularly over the hymenium, 

 and 15 to 20 microns apart. The stipe is 10 centimeters or 

 less high and 1 to 4 millimeters thick. It is equal, straight, 

 smooth, and hollow. The fungus grows on horse manure and 

 rotted leaves. 



COPRINUS REVOLUTUS Copel. 



Coprinus revolutus has a pileus 2 centimeters or less wide, 

 which passes from campanulate through plane to broadly re- 

 volute. The disk is flat and brown-granulose with a sub-fur- 

 furaceous and sulcate periphery. The gills number up to 

 seventy or less and barely touch the stipe. They are narrow, 

 acute at both ends and black. The spores are black, apical at 

 the base, and measure 11 to 13 by 8 microns. The stipe is 

 about 10 centimeters high, 1 to 1.5 millimeters thick at the 

 top, 2 to 2.5 millimeters toward the base, and is white, hollow, 

 fragile and velvety below. This species grows on dung. 



COPRINUS RIMOSUS Copel. 



Coprinus riniosus is characterized by having a pileus 1.5 to 

 2 centimeters high and wide, being thin, cylindric, campanulate 

 or conical, truncate, and naked. It splits very early downward 

 through the gills and consequently is plicate in appearance. 

 It is tawny-gray outside, turning black in clefts. The tawny 

 disk is flat or concave. The gills are free and somewhat remote, 

 cut away towards the stipe, obtuse at the margin, black, becom- 

 ing pale with age and have no cystidia. The spores are 15 by 

 13.5 microns, black and tj^pically subangular and broadest to- 

 ward the apex. The stipe is hollow, white, naked, and equal. 

 The fungus grows on horse manure. 



COPRINUS STERCORARIUS Fr. 



Coprinus stercorarius has a pileus that is very thin, ovate at 

 first, then companulate and covered with a dense white micaceous 

 meal. Later it is expanded, being 2.5 centimeters broad and 

 2 centimeters high. The margin is striate. The stem is at 

 first ovately bulbous, then elongated, attenuated, at first prui- 

 nate, and white. The gills are adnexed, ventricose, and black. 

 The spores are 14 to 15 by 8 microns. This species grows on 

 rich soil and dung. 



