COPRINUS STERQUILINUS 225 



at one end of the spore in the Hne of the median spore-axis, and that 

 there is a deep concave central depression in the spore surrounded 

 by a broad and oval rim, so that one is reminded of a perforated 

 indiarubber ball of which the upper side has been pushed downwards 



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% 



Fig. 94. — Coprinus sterquilinus. A pliotograph of a thin dry spore-deposit 

 collected upon a glass slide set a few inches beneath a pileus of a fruit-body 

 growing on horse dung in the laboratory. The culture-dish, fruit-body, 

 and slide were all covered by a bell-jar. The deposit is seen from above. 

 All the spores are boat-shaped, with the hollows looking toward the observer ; 

 but, owing to the blackness of the spore-walls, the hollows cannot be seen 

 in the photograph. Tliis photograph shows the typical appearance of a 

 spore-deposit taken from 1 inch to 6 feet below a pileus in still air. Photo- 

 graphed dry for W. F. Hanna and the author by A. E. Field. Magnifica- 

 tion, 500. 



from above. Owing to the blackness of the spore-wall, the central 

 depression in each of the dried spores, in a photograph such as that 

 reproduced in Fig. 94, shows either not at all or but faintly. The 

 depression, as seen from above, has therefore been represented 

 diagrammatically in Fig. 95, M. (2) If now one takes the shde 

 bearing the spore-deposit and, instead of lajnng it flat, turns it 

 through a right angle, fixes it in position on the stage with an iron 



VOL. III. Q 



