Bui. 85, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate IV. 





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Fig. 1.— a Young Spccimen of the Common Puffball 

 (Calvatia craniiformisi. 



Fig. 2.— The Oyster Mushroom i Pleurotus ostreatusi, Growing on Decayed 



Willow Log. 



