316 RESEARCHES ON FUNGI 



of tetrasterigmatic basidia (Fig. 105, b, c, e ; vide also basidia 

 nos. 48 and 57 in Fig. 147, Chap. XIII). 



Disterigmatic basidia have been observed by me as normal in 



* 



FIG. 107. Coprinus bisporus. Photomicrograph of a portion of the 

 hymenium in surface view. The spores of the long basidia 

 only are in focus, but those of the short basidia can be faintly 

 seen out of focus. All the basidia, except three, bore two 

 spores. The three exceptions (one at the right top corner, one 

 below the left top corner, and one in the middle of the lower 

 edge) each bore one spore of large size. Magnification, 480. 







a form of Mycena galericulata, in the cultivated forms of Psalliota 

 catnpestris (Fig. 105), in Coprinus bisporus (Figs. 106 and 107), 

 Galera hypnorum, Hygrophorus conicus, and Calocera cornea. They 

 occur too, as the literature of mycology shows, in a number of 

 other species, e.g. Amanita bisporigera Atkinson, 1 Pistillaria 



1 C. E. Lewis, "The Development of the Spores in Amanita bisporigera," 

 Botanical Gazette, 1906, pp. 348-352. 



