Fig. 205. — Abnormal excretion of large drops from the hila of spores of Uredineae 

 and Hymenomycetes. A, part of a basidium of Puccinia grarninis, which has de- 

 veloped in a film of water but has produced aerial sterigmata and spores. At a, a 

 drop of water about normal size has been excreted from the hilum. At b, a drop has 

 grown beyond normal size and has stepped up on to the side of the spore. At c, a 

 spore enveloped in a very large drop of water has just been shot frona its sterigma. 

 At d, a drop of the maximum size enclosing a spore. This globule was seen to be 

 shot away. B and C, basidia of Coprinus sterquilinus- ■with excretion of abnormally 

 large drops of water before spore-discharge. B, the right-hand spore has excreted a 

 drop of normal size. The drop on the left-hand spore has increased beyond the normal 

 size and has stepped up on to the side of the spore. C, the drop on the left-hand spore 

 has grown very large. The right-hand spore, bearing its abnormally large drop, has 

 just been shot from its sterigma. D, E, F, and G, stages in the abnormal excretion 

 of water from the hila of two spores of a basidium of the cultivated Mushroom 

 {Psalliota campestris). D, one drop is of normal size, the other larger than normal. 

 The latter has stepped up on to the side of the spore. E, the drops have grown 

 larger. F, the drops have touched and joined, so as to form one drop which has 

 dragged the spores toward one another. G, the drop has continued to increase in 

 size and has now become globular. The spores were not discharged. Magnifica- 

 tion, the same for all, 880. A scale is shown at the top of the Figure. 



