THE BASIDIOMYCETES 



211 



then undergoes 2 divisions to form 4 daughter nuclei. Each of 

 these nuclei has x number of chromosomes and is therefore hap- 

 loid. Next, from the apex of the enlarging basidium 4 protru- 

 sions (sterigmata) arise. These protrusions expand terminally, 

 and a nucleus passes into each inflated tip. When delimited, the 



Fig. 111. Common genera of so-called mushrooms, nearly all of which 

 are Basidiomycetes. (Courtesy, General Biological Supply House, Inc., 

 Chicago, Illinois.) A. Agaricus. B. Amanita. C. Boletus. D. Geaster. 

 £. Coprinus. F. Pleurotus. G. Alorchella (Discomycete). H. Lycoperdon. 



/. Clavaria. 



