The Saprophytic Fungi of Eastern Iowa. 43 



Height ^'-i'. Pileus y^, inch more or less, usually less. 

 July-September. 



A curious Httle fungus, not rare in wet places. Said to be 

 lignatile, but so far with us found upon the ground only. Gre- 

 garious. 



21. Agaricus fibula. — Bull. 



Pileus convex, smooth, very delicate, dull yellow, slightly 

 striate. Lamellae paler, long decurrent narrow but not 

 crowded. Stipe smooth, concolorous, hollow. 



Height abont i'. Pileus Y^' . June-November. 



A most dainty little species commonly found on patches of 

 moss in protected situations. 



Subgenus Pleurotus. 



Stipe lateral when present, generally poorly defined or en- 

 tirely lacking. Lignatile. 



22. Agaricus sapidus. — Kalch. 



Pileus fleshy with thin margin compound, irregular and 

 distorted, depressed behind, glabrous, dull white, or yellow- 

 ish; lamellae narrow decurrent white not crowded; stipe solid, 

 several divisions arising from a common trunk as in the 

 merismatic Polypori. Spores lilac-tinted. 



Stipe I '-2' long. Pileus various, some times 5 '-6'. June 

 to November. 



Very common on all sorts of decaying tree trunks. Easily 

 recognized by the irregular compound structure, but especi- 

 ally by the tinted spores which are readily secured in quantity 

 sufficient to exhibit the lilac color. 



SERIES II. HYPORHODII— Rosy-spored Agarics. 



Subgenus Pluteus. 



Veil wanting. Pileus distinct from the stem. Lamellae 

 free. 



