132 THE AGARICACEAE OF MICHIGAN 



j 



106. Russula dustosa Pk. (Edible) 



N. Y. State Mus. Eep. 39, 1886. 



Illustration : N. Y. State Mus. Bull. 07, PI. 84, Fig. 1-7, 1903. 



PILEUS 5-12 cm. broad, lirm, convex then expanded and de- 

 pressed in the center, surface cracked except on disk, the areas 

 ■crustlike, sordid cream-color, dirty brownish or ochraceous, usually 

 tinged with olive or green, viscid when young or moist, especially 

 on the disk, striate on margin when mature. FLESH white. GILLS 

 ckill loliite, becoming somewhat dingy cream color in age, rather 

 broad in front, narrowed toward the stem, adnexed or free, thick, 

 distinct, not crowded, rather brittle, feAV forked, few short. STEM 

 3-6 cm. long, 1-2.5 cm. thick, short, stout, spongy-stuffed, subequal or 

 ventricose, white. SPORES white, subgiobose, 8-10 micr. CYS- 

 TIDIA rather numerous, extending clear through the subhymenium. 

 Suhliynienium sharply separated from gill-trama. TASTE mild. 

 ODOR none. 



Scattered or gregarious. Oak and maple woods in southern 

 Michigan. Jul}^ to September. Common. 



This is near R. virescens and is apparently much more common. 

 It seems to be still referred to R. virescens by some authors, al- 

 though in that case the Friesian description will have to be modi- 

 fied to include it. 



Michochemical tests: G. (Flesh and gills become deep blue,) 

 S V. (Gills and flesh very slowly tinged blue.) F S. (Cystidia 

 colored brown.) 



107. Russula ochraleucoides sp. nov. 

 Illustration : Plate XV of this Report. 



PILEUS 6-12 cm. broad, large, rigid, convex, soon expanded- 

 plane, varying straw-yellow to pale ochraceous, usually dull ochre 

 to reddish-ochre toward center, pellicle adnate, soon dry, and pul- 

 vei-ulent or subrimose, even on the obtuse margin. FLESH thick, 

 compact, white, unchanging or slightly sordid in age. GILLS ad- 

 nexed or free, rather narrow, rounded and slightly broader in front, 

 white or whitisli, close to subdistant, shorter ones intermingled, 

 often forked in posterior part, intervenose. STEM 4-6 cm. long, 

 1.5-2 cm. thick, short, rigid, equal or tapering slightly downward, 

 white, glabrous or subpruinose, spongy-solid, even or obscurely 



