162 Journal of Mycology [Vol. 12 
I. CYATHIFORMES. Pileus submembranaceous, at 
length depressed, umbilicate or even inf undibuliform. 
A. STIPE GLABROUS. 135-140. 
B. STIPE VELVETY OR PRUINATE. 141-143. 
II. CLAVIFORMES. Pileus membranaceous , campanu- 
late or convex, never depressed. 
A. STIPE GLABROUS. 144-145. 
B. STIPE VELVETY OR PRUINATE. 146-148. 
§ 4. PLEUROTUS. PILEUS MORE OR LESS IR¬ 
REGULAR; THE STIPE EX CENTRIC, LATERAL OR 
WANTING. COMMONLY GROWING ON WOOD. 
A. STIPE EXCENTRIC. 
a. Lamellae colored. 149-151. 
b. Lamellae white. 152-153. 
B. STIPE LATERAL AND VERY SHORT. 
a. Lamellae colored. 154-158. 
b. Lamellae white or pallid. 159-162. 
SYNOPSIS TO NORTH AMERICAN SPECIES OF 
HELIOMYCES. 
HELIOMYCES Le'ville Champ, exot. Am. Sc. Nat. 1844. 
Pileus coriaceous- or membranaceous-tremellose, plicate- 
sulcate or rugulose. Stipe central, tough , cylindric, hstulose. 
Lamellae similar in substance to the pileus, the edge acute; spores 
white. 
Small Agarics which are tremelloid when fresh and growing, 
and when dry have the appearance of Marasmii. 
A. STIPE GLABROUS. 
a. Pileus colored from the first. 1-2. 
b. Pileus at first white. 3-4. 
B. STIPE PRUINOSE. 5-6. 
FIELD NOTES ON THE UREDINEAE. 
A. O. GARRETT. 
The following notes refer to collections of rusts made during 
the past three years at the head of Big Cottonwood Canyon, 
about thirty miles from Salt Lake City. The altitudes for the 
following species range from 8,500 to 9,500 feet. 
Puccinia scandica Johans. — On Aug. 13 the writer col¬ 
lected an aecidium on young plants of Epilobium alpinum which 
