26 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



3. Cap somewhat viscid when moist, often irregular; 



stem short C. orcella 



Cap not viscid 4 



4. Cap I to 2 inches broad ; g^lls dark gray ; stem stuffed 



C. popittalis 

 Cap 2 to 4 inches broad ; gills white or pale gray ; 

 stem solid C. abortizms 



5. Cap glabrous 6 



Cap silky, umbilicate, somewhat zoned C. micro pus 



6. Cap I inch broad; stem with a close white tomentum 



at base C, unitinctus 



Cap I to 3 inches broad, slightly fibrillose; often 

 growing in greenhouses C. tardus 



AGARICUS Linn. 



Stem terminating in an abrupt bulb A. abrnptus 



Stem not distinctly bulbous i 



1. Cap thin 2 



Cap fleshy 3 



2. Cap yellow-white, fibrillose-silky A. comptulus 



Cap white, brown in center, covered with minute brown 



scales A. placomyces 



3. Gills narrow, rounded behind A. Rodmani 



Gills broad 4 



4. Gills at first white ; ring on stem large and thick A. arvensis 

 Gills at first pink; ring more or less torn, often dis- 

 appearing A. campestris 



Varieties of Agaricus campestris 



Cap covered with red scales var. praticola 



Cap not covered with red scales I 



I. Cap brown or yellow-brown, covered with minute hairs 



var. hortensis 

 Cap and stem brown, scaly var. znllaticus 



STROPHARIA Fr. 

 Cap hemispherical at maturity ; stem glabrous S. semiglobata 

 Cap at first hemispherical, expanding at maturity ; stem 

 downy below the ring 5. stercoraria 



