136 THE AGARICACEAE OF MICHIGAN 



110. Russula foetentula Pk. 

 N. Y. Stale Mus. Bull. 116, 1907. 



PILEUS 3-7 cm. broad, soon fragile, at first subheuiispherical 

 then convex to plane and depressed, viscid, livid-ochraceous, russet- 

 tinged, disk darker and innately granular, long tuberculate-striate. 

 Margin at first incurved. FLESH thin, whitish. GILLS aduexed or 

 nearly free, close, rather narrow, broader in front, thin, whitish, 

 often spotted or stained reddish. STEM 2.5-5 cm. long, 6-12 mm. 

 thick, subequal, somewhat firm, spongy-stuffed, soon cavernous, 

 whitish or sordid-white, stained at the very base by cinnabar-red 

 stains. SPORES 7-9 x 6-7 micr., echinulate, creamy-white in mass. 

 CYSTIDIA moderately abundant. BASIDIA 40-45x9 micr., 

 4-spored; subhymenium scarcely differentiated. OROR none or 

 somewhat like oil of bitter almonds, varying in intensity. TASTE 

 very slightly acrid. 



Scattered or gregarious. On the ground in frondose woods. Ann 

 Arbor. Abundant in 1911. 



This species has characters intermediate between R. foetens and 

 R. pectinatoides and is most easily distinguished from both by the 

 reddish stains at the base of the stem ; this character was very con- 

 stant in many individuals during a single season. The odor varies 

 much iu intensity and is often lacking. The pileus is sometimes 

 tinged with reddish-yellow but most of our plants had a decided 

 russet color at maturity. Micro-chemical tests as in R. pulverulenta. 



111. Russula foetens Fr. 

 Syst. Myc, 1821. 



Illustrations: Fries, Svamp. Sverig., PL 40. 

 Cooke, 111., PI. 1046. 



Gillet, Champignons de France, Xo. 612. 

 Michael, Fiihrer f. Pilzfreunde, Vol. I, No. 45. 

 Ricken, Blatterpilze, PI. 19, Fig. 4. 

 Hard, Mushrooms, Fig. 147, p. 185, 1908.. 

 Plate XVII of this Report. 



PILEUS 7-12 cm. broad, fleshy, hard then fragile, subglobose then 

 expanded and depressed, viscid when moist, thin margin at first 

 incurved, tiiberculate-sulcate when expanded, yellowish or dingy 

 ochraceous, pellicle adnate. FLESH thin, rigid but fragile, dingy 



