COPRINUS PLICATILIS 47 



down on the hymenium), it appears oval (Fig. 32, A and B). In 

 different fruit-bodies the spores vary considerably in their size and 

 to some extent in their shape (cf. A, B, and C in Fig. 32). While 

 in most fruit-bodies the spores in front view are distinctly heart- 



FiG. 31. — Coprinus plicatilis. Cross-section of part of a gill, to sliovv the 

 elements of which it is constructed. The hymenium consists of trimorphic 

 basidia, sterile paraphyses, and cystidia : a a, long basidia ; b b, basidia of 

 medium length ; c c, short basidia ; ^ p paraphyses ; cZ, a cystidium. The 

 trama 1 1 consists of a network of hyphae ; there is no special well-marked-off 

 subbymenium. Material obtained at King's Heath, England. Magnification, 

 426. 



shaped, in some fruit-bodies they are spindle-shaped. In the 

 extremely large fruit-body already mentioned in connection with 

 a discussion of Coprinus hemerobius, the spores, although still 

 somewhat broader than they were thick, were almost oval with the 

 lower half only sHghtly wider than the upper half (Fig. 23, d-f, 

 p. 39). 



The rate of fall of the spores of Coprinus plicatilis, in still air, 

 just after they have left the gills, was found for one fruit-body to 



