COPRINUS STERQUILINUS 



219 



of any hymenomycetous fungus which I have as j^et investigated. 

 A single spore is relatively so gigantic that, as indicated in Fig. 93, 



Fig. 92. — Coprinus sterquilinus. Photomicrograph of some living spores placed 

 in water, showing their oval form and dense black wall. Here and there, at 

 a spore's basal end can be seen the pointed spore-hilum, and at a spore's apex 

 a light spot indicating the presence of an apical pore. A colourless wall- 

 meniscus is faintly visible on the more sharply rounded side of each of the two 

 uppermost central spores. Magnification, 650. 



a whole basidium of a cultivated Mushroom {Psalliota campestris) 

 with its two sterigmata and spores has a smaller volume. The rate 

 of fall of the spores, since they are so large, must be relatively 

 high. Spores of Amanitopsis vaginata which were spherical and 



