The Saprophytic Fungi of Eastern Iowa. 35 



The genus first named, Agnriais, is typical of the whole 

 group and contains by far the greater number of forms. In 

 our flora the remaining genera are outhers, so to speak, with 

 here and there a species. Some as we shall see are represen- 

 ted in our flora by but a single form. 



The further classification of this dominant genus proceeds 

 primarily according to the color of the spores, as follows' : 



a. Spores white, --.-.--.. Lcmospori. 



b. Spores salmon-colored, ---.... Ilyporhodii. 



c. Spores ferruginous or tawnv, ...... Dervmii. 



d. Spores purplish, or purplish brown, ..... Pratelli. 

 €. Spores black, ...•-..-. Coprtnarii. 



SERIES I. LEUCOSPORI— The white-spored Agarics. 

 Siibgemis Amanita. 



Veil universal distinct from the cuticle of the pileus; hymen- 

 ophorum (pileus) distinct from the stem. — Berk. 



Plants of this subgenus are easily recognized. The univer- 

 sal veil is readil}^ seen in the unopened specimens. After the 

 elevation and expansion of the pileus the remnants of the volva 

 appear as fragments more or less conspicuous on the pileus, 

 and surrounding the base of the stipe as a sheath. The stipe 

 is articulated with the pileus and easily detachable from it. 



The following are our species: 



I. Agaricus muscarius. — L. 



Pileus at first hemispherical, then expanded, convex, the 

 margin striate, orange, or yellow with the disk reddish, the 

 whole surface under favorable circumstances covered with 

 angular patches of the disrupted volva; lamellae narrowed 

 toward the stipe, white, free; stipe bulbous, sheathed with the 

 scaly volva, as with imbricating layers. Stipe annulate, pithy, 

 or at length hollow. 



Height 4'-6', width 3'-5'. August. 



I. To see the color of the spores cut from the stipe the pileus and lay it gills 

 down upon a sheet of paper, white or black. Cover now with a bell-jar or 

 tumbler or leave entirely uncovered, and in a short time spores will have 

 fallen ir sufficient quantity to show the color. 



