EEPOET OF THE STATE BOTANIST 321 



PLATE 6. 



Agaricus campester L. 



Common Mushroom. 



Fig. 1 A cluster of three young plants, in one of which the veil has just 



separated from the margin of the cap, thereby revealing the gills. 



" 2 and 3 Plants with their caps partly expanded and their gills yet 



pink-colored . 



•' 4 A mature plant with its cap fully expanded and its giUs blackish-brown. 

 ' ' 5 Vertical section of the cap and upper part of the stem of an immature 



plant. 

 • ' 6 Vertical section of the cap and upper part of the stem of a mature 



plant. 

 ' ' 7 Four spores, X 400 . 



Variety hortensis. 

 Fig. ^: An immature plant. 

 ' ' 9 A mature plant. 

 ' ' 10 TTour spores, X 400. 



PLATE 7. 



Agaricus subrufescens Peck. 



Slightly Reddish Mushroom. 



Fig. 1 A young plant whose veil has just separated from the margin of the 



cap, revealing the whitish color of the gills. 

 " 2 A cluster of four plants, two young, and two older ones with the caps 



partly expanded and the gills yet of a pinkish hue. 

 3 A single plant approaching maturity. 

 • ' 4 A mature plant whose gills have assumed the blackish-brown color. 

 • ' 5 Vertical section of the cap and upper part of the stem of a young 



plant. 

 * ' 6 Vertical secti' n of the cap and upper part of the stem of a middle-aged 



plant. 

 ' ' 7 Vertical section of the cap and upper part of the stem of a mature 



plant. 

 ' ' 8 Four spores, X 400.. 

 ' ' 9 Branching strings of mycelium. 



PLATE 8. 

 Agaricus arvensis Schreff. 

 . Field Mushroom. Horse Mushroom. 

 Fig 1 A young plant with the v. i! just separated from the margin of ih.< 

 cap. 

 • 3 A plant with the cap partly expanded, showing the dingy pinkish 



hue of the gills. 



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