COPRINUS CURTUS 



13 



bodies proportionately smaller; margin just before autodigestion be- 

 gins white, slightly divided so as to form a flange, and somewhat 

 fimbriate. Flesh at disc brownish (vandyke), thin. Spores black in 



Fig. 7. — Coprinus curt us. A study of the surface of the pileus. A, a fruit -body on 

 horse dung obtained from Kew, England, beginning to expand and exliibiting 

 small reddish scales on its pileus. B, a pilear scale 0-7 mm. long, as seen in a 

 surface view near the top of the pileus. C, about two -thirds of a pilear scale, 

 as seen in a surface view of the pileus, showing : colourless cells c, light-brown 

 cells I, and dark-brown cells b. I), a surface view of the pileus-flesh in a scale- 

 less region, showing the palisade cells p, living capitate pilocystidia /;, and a 

 withered pilocystidium w. E, another surface view of the pileus-flesh showing 

 the palisade cells p, scale-cells s above the palisade cells, and pilocystidia h 

 which appear to have developed from scale-cells. A, natural size ; B, Jiiagnifieil 

 64 ; C, D, and E, magnified 293. 



the mass, dark brownish to black under the microscope, elliptical. 

 9-15 X 6-9 (x. Cystidia (pleurocystidia) on the sides of the gills 

 none. Clamp-connexions on the diploid mycelium always absent. 

 Habitat : on horse dung at Kew and Taunton, August and 

 September, 1911 ; commonly coming up on horse dung in cultures 



