THE FUNGI 405 
cus. This species grows abundantly on various species of pines, 
spruces and larches. 
Famity III.—Acaricace&, the gill family, in which the 
hymenium covers blade-like plates of the pileus, called gills, 
generally occurring on the under surface of the same. Accord- 
Fic. 300.—Meadow mushroom (Agaricus campestris L.). A, view showing 
under side of pileus; g, gills; 2, annulus, or remains of the veil attached to the stipe, 
B, side view; s, stipe; a, annulus; p, margin of pileus, showing at intervals the 
remains of the veil. (Gager, after W. A. Murrill.) 
ing to the color of their spores the members of this family are 
divided into 5 groups: 
1. Leucospore or white-spored, as Amanita. 
2. Rhodospore or red-spores, as Pluteus. 
3. Ochrosporz or brown-spored, as Pho/iota. 
4. Porphyrosporee or purple-brown spored, as Agaricus. 
5. Melanospore or black-spored as Coprinus. 
The color of the spores is best determined by cutting off the 
pileus, placing it gill-surface downward on a piece of smooth 
paper and covering it with a bell jar. Within a day or less the 
spores, falling off the gills, leave an imprint of the gill arrange- 
ment which is called the spore print. 
Acaricus CAMPESTRIs (CommMon MusHroom).—This plant. 
also referred to as Psalliota campestris (L.) Fr. by some authors 
is a common edible gill fungus which grows in open, grassy 
