PANAEOLUS CAMPANULATUS 323 



accident of actual contact of two of the spores. At B, C, E, and 

 H, the spores are all young, for none of them have yet turned 



* * : ' 



B 



o 







O 



: 



* 00 





o o" . 







oo 



G * * H o i^* 



FIG. 112. Panaeolus campanulatus. Studies of the relative positions 

 of spores on adjacent basidia. As if to avoid jostling with the 

 spores of adjacent basidia, the spores of certain basidia have a 

 rhomboidal arrangement. This is clear in A, D, F, and H, where 

 the spores have attained full size, but the phenomenon is also to be 

 seen in B, C, and E, where many of the spores are only partially 

 grown. In D, actual contact of two spores occurs, and in F is only 

 just avoided. At G, the spores have nearly a domino arrange- 

 ment. Ripe or nearly ripe spores are black, those full-sized and 

 turning black are dotted, spores which are still colourless are 

 unshaded. Magnification, 293. 



black and some, indeed, have not yet attained full size. Yet, 

 even here, the rhomboidal arrangement can be clearly seen. This 

 shows that the sterigmata take up their final positions, so far as 

 divergence is concerned, during their development, and further, 

 that the sterigmata grow outwards in such directions that in the 



