276 



RESEARCHES ON FUNGI 





>)°C° O "h" ••' ° o J* 



The gill-edges, which 

 abut upon the stipe when 

 the pileus is unexpanded, 

 are covered with swollen 

 sterile cells, smaller than, 

 a but resembling in general 

 characters, the cystidia 

 which have just been de- 

 scribed (Fig. 114, e, 



271, 



and Fig. 117, e). To dis- 

 tinguish the cystidia at the 

 gill-edges from those on the 

 gill-sides, we may refer to 

 the former as cheilocystidia 

 and the latter as pleuro- 

 cystidia} 



In Coprinus comatus and 

 C. sterquilinus, as we have 

 seen, there are flanges at 

 the gOl-edges. In Coprinus 

 atramentarius, on the other 

 hand, there are no such 

 flanges {vide Fig. 114, e, 

 p. 271). 



The hymenium of Cop- 



FiG. 117. — Coprinus atramentarius. 

 Surface view of a piece of gill, 

 104 mm. long and 0-4 mm. 

 wide, taken from the region r 

 in Fig. 118, A. To show the 

 distribution of the cystidia 

 and basidia just before the 

 beginning of spore-discharge 

 and autodigestion. e — e, the 

 oblique free inner edge of the 

 gill bearing marginal cystidia, 

 m; c, cystidia projecting from the gill ; a a, places where cystidia from the 

 adjacent gill were in contact with the hymenial surface before the gills 

 were torn apart. Between the cystidia are shown the spores of the basidia. 

 The spores were all black, but for diagrammatic clearness the spores of the 

 long basidia only, Z, have been made black, whilst those of the short basidia, s, 

 have been left unshaded. Magnification, 147. 



1 Cf. these Researches, vol. ii, 1922, pp. 248, 324 ; also vol. iii, pp. 52-53. 



