AGARICS WITH BLACK SPORES 



monly known as the Horse Mushroom, is 

 found in situations similar to those men- 

 tioned iov A. campestris. Typical forms of 

 the Horse Mushroom in the field are larger 

 and stouter than the Field Mushroom, and 

 are particularly distinguished from the 

 latter by the possession of a double ring. 

 Descriptions differ regarding pileus (color) 

 characters; but in any event there would 

 appear to be several varieties in cultivation 

 w^hich may be properly referred to this spe- 

 cies. Especially interesting has been one 

 thin capped brown variety, possessing what 

 was clearly a double ring, yet one much 

 more delicate than usual. Under cultiva- 

 tion the writer has been unable to find A. 

 campestris better in flavor than A. arvensis. 

 Agaricus fabaceus [A, subrufescens) is 

 the almond-flavored and almond-fragrant 

 mushroom (Plate VI ^). This species is 

 reported as springing up in greenhouses 

 and in flower beds. It is readily dis- 

 tinguished from any of the allies of A. 

 campestris by (i) the long-persistent mem- 



151 



