294 RESEARCHES ON FUNGI 



Other Coprini belonging to the Atramentarius Sub-type.— 

 Among the Coprini belonging to the Atramentarius Sub-type are : 

 Coprinus narcoticus, C. urticaecola, C. stercorarius, C. rnacrorhizus, 

 and C. picaceus. In all these species cystidia cross the interlamellar 

 spaces and interlock the gills during the discharge of the spores in 

 the same manner as in C. atramentarius. 



Coprinus narcoticus (Fig. 125, also Vol. II, Fig. 108, p. 318) 

 has sometimes been confused with C. niveus (Fig. 126). It resembles 



Fig. 120. — Cojirinus ?Mi»et«.s in pure culture on horse dung. The pileiare 

 covered witli a snow-wiiite floccose meal. Natural size. 



C. niveus in size, in having its pileus covered with a loose more or less 

 squamulose meal composed of numerous, spherical, easily detachable 

 cells, and in coming up on horse dung ; but it differs from C. niveus 

 in its pileus being greyish- white instead of snow-white (c/. Figs. 125 

 and 126), in having trisporous basidia instead of quadrisporous 

 (Vol. II, Fig. 109, p. 319), and in emitting a remarkably pungent 

 odour during autodigestion instead of being practically scentless. 

 Both C. narcoticus and C. niveus possess cystidia but, during 

 spore-discharge, whereas those of C. narcoticus interlock the gills, 

 those of C. niveus merely project from the gill-sides like pegs, as 

 in C. lagopus. 



Coprinus urticaecola was described and illustrated in Chapter VI 

 (Figs. 54 and 55, pp. 133 and 136). Its pilei are small ; but the gills, 



