138 



{Octoher nth, 1910.) 



A. E. Hilton : Aethalium of Spumaria alha, x 20. The 

 Plasmodium of this species is heavily charged with calcium 

 carbonate. It creeps up grass stems, and forms an aethalium 

 three or four inches above the ground. In the process of spore- 

 formation the plasm is purified from lime, and condenses into 

 branched and lobular masses of spores ; the whole of the lime is 

 deposited outside as a thick crust of white crystals. From the 

 specimen exhibited the lime has been removed to show the 

 lobular formation of the confluent sporangia. 



