PLANTS OF IOWA 73 



900. P. tuber culosus, Fries. 



Rare. Resembles somewhat the preceding species, but 

 is smaller, not brightly colored, and is never glutinous. 

 June. 



901. P. unicolor, Vahl. 



Very common, found everywhere on rotten logs, in 



moist ravines. 

 INOCYBE, Fries. 



902. /. lanuginosus, Bull. 



Rare. Occur in our oak groves and undisturbed wood- 

 lands generally. 

 FLAMMULA, Fries. 



903. F. fusus, Batsch. 



Very common in woodlands on the ground in late sum- 

 mer and fall. 

 NAUCORIA, Fries. 



904. N. semiorbicularis, Bull. 



Rather common in autumn in pasture fields, woodlands, 



and by the waysides everywhere. 

 GALERA, Fries. 



905. G. tener, Schaff. 



Very common in summer on lawns and grassy places. 



906. G. hypnorum, Batsch. 



Common in spring on fresh, green tufts of various 



mosses, in damp woods. 

 CREPIDOTUS, Fries. 



907. C. mollis, Schaeff. 



Common on fallen trees and branches, particularly on 

 species of Populus. . 



SERIES IV. PORPHYROSPOR.E THE PURPLE-SPORED AGARICS. 



AGARICUS. 



908. A. arvensis, Schaeff. 



In cultivated grounds; not abundant. September and 

 October. 



909. A. campester, L. 



Common mushroom. Extensively cultivated and used for 

 food in all lands. 



