Agaricacese 



Russuia. Pileus fleshy, convex, slightly depressed in the center, not polished, 

 yellow, the margin at first even, then slightly striate-tuberculate. Gills 

 nearly entire, venose-connected, white, then cinereous or yellowish. 

 Stem firm, solid, yellow, sometimes white at the top. 



Spores yellow, subglobose, 6.5-7.6^ in diameter. Flesh white, taste 

 mild. 



Plant 2-3 in. high. Pileus 2-3 in. broad. Stem 4-6 lines thick. 

 Frost Mss. 



Ground in woods. Sandlake. August. Peck, 32d Rep. N. Y. 

 State Bot. 



R. flavida is showy, solitary and in patches. The stem when young 

 and solid is equally good with the cap. Cooks in twenty-five minutes 

 and is of good flavor. 



HETEROPHYL'L^E. 



R. ves'ca Fr. vesco, to feed. Pileus red- flesh-color, disk darker, 

 fleshy, slightly firm, piano-depressed, slightly wrinkled with veins, with 

 a viscid pellicle, margin at length spreading. Flesh cheesy, firm, shin- 

 ing white. Stem solid, compact, externally rigid, reticulated and 

 wrinkled in a peculiar manner, often attenuated at the base, shining 

 white. Gills adnate, crowded, thin, shining white, with many unequal 

 and forked ones intermixed, but scarcely connected by veins. 



Of middle stature. Taste mild, pleasant. Fries. 



Spores globose, echinulate, white, 9 io/, diameter Massee. 



In mixed woods. Common. August to frost. 



R. vesca is frequent in woods or margins, and under trees in the 

 open. It is especially fond of growing in the grass under lone chestnut 

 trees. The caps seldom exceed 2.% in. across. 



It is one of the best. 



R. cyanoxan'tha (Schaeff. ) Fr. Gr. blue; Gr. yellow. (From the 

 colors.) (Plate XLIV, fig. i, p. 184.) Pileus 2-3 in. and more 

 broad, lilac or purplish then olivaceous-green, disk commonly becoming 

 pale often yellowish, margin commonly becoming azure-bine or livid 

 purple, compact, convex then plane, then depressed or infundibuliform, 

 sometimes even, sometimes wrinkled or streaked, viscous, margin 

 deflexed then expanded, remotely and slightly striate. Flesh firm, 



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