COPRINUS CURTUS 7 



subsequently allowed to fruit, but the production of perfect or of 

 imperfect fruit-bodies was irregular and did not coincide with 

 expectation either for bisexuality or quadrisexuality. Hence the 



Fig. 3. — Coprinus curtus. Pure culture on horse-dung balls. Fruit-bodies about 

 to expand. The scales on the pileus, which could be seen with a lens in the 

 original photograph as small and colourless particles, are here invisible. 

 Photographed at Cornell University by the late G. F. Atkinson, to whom the 

 author sent the culture. Natural size. 



criterion of fruiting had to be discarded. Brunswik,^ relying on 

 this criterion alone and basing his argument on a very limited number 

 of matings, came to the conclusion that individual strains of C. 

 curtus are of the two-scheme type or bisexual. Since the mycehum 



1 H. Brunswik, loc cit., p. 125. 



