PLANTS OF IOWA 75 



919. C. atramentarins, Bull. 



Very common everywhere in dense tufts and mas 

 rarely solitary. From May to December. 



920. C. niveus, Fries. 



Common about stables, especially after summer showers. 



921. C. micaceus, Fries. 



Very common the year through at the base of stumps 

 and on the ground in dense masses. 



922. C. nycthemerus, Fries. 



Everywhere on manured land, lawns; from May to 

 September. 



923. C. plicatilis, Fries. 



On the moist earth on lawns, fields, woodlands; very 

 short-lived, evanescent. 

 Pan^olus, Fries. 



924. P. campanulatas, Linn. 



Very common all summer on horse dung and richly 

 manured land. 



925. P. fimicola, Fries. 



Very common in similar places and with the preceding. 



926. P. papilionaceus, Fries. 



Common. Occurs in similar places and with the pre- 

 ceding species. 



PSATHYRELLA. 



927. P. atomatus, Fries. 

 Common on grassy lawns. 



GASTEROMYCETES. PUFF-BALLS. 



SCLERODERME^E FAMILY. 



Scleroderma. 



928. 8. vulgar e, Horneman. 



Very common; in pastures, woods and fields. August 

 to October. 



TULOSTOME^E FAMILY. 

 TULOSTOMA. 



929. T. mammosum, (Micheli) Winter. 



Common in sandy places by streams and in alluvial 

 soils. September and October. 



