72 -ELEVENTH REPORT. 



or dark red forms and was called R. atropurpurea Pk. but since this name 

 was preempted, he changed it to R. squalida. It seems close to the ]:)receding. 



17. RussuLA FLAViDA Frost. 

 (The white-gilled yellow Russula.) 



Illustrations: N. Y. State Mus. Bull. 105. 1906. PI. 97, p. 38, fig. 1-6. 



This striking species with yellow^ cajD and stem and the gills M^hite, has 

 not been reported within the state. It no doubt occurs, as it is a northern 

 species and I append the description as given by Peck. 



PiLEUs 5-7.5 cm. broad, firm, convex, becoming nearly plane or centrally 

 depressed, dry, frequently sprinkled with minute mealy yellowish particles, 

 specially on the margin, pale yellow, sometimes l^righter yellow or orange 

 in the centre. Flesh white. Gills rather thick, moderately close, entire 

 or nearly so, adnate, ivhite. Stem equal or slightly tapering upward, solid, 

 sometimes becoming spongy within, occasionally cavernous, colored like 

 the pileus or a little paler, sometimes brighter at the base, 3-7.5 cm. long, 

 8-15 mm. thick. Spores yellowish, subglobose, 7-8 micr. Taste mild. 



18. Russula virescens (Schaeff.) Fr. 

 (The Greenish Russula.) 



Illustrations: N. Y. State Mus. Rep. 48, Bot. edition. 1894. PI. 31, p. 

 189, fig. 1-8. Atkinson's Mushrooms. 1900. PI. 36, p. 126, fig. 1. 

 Mcllvaine American Fungi, 1900. PI. 44, p. 184, fig. 6. Marshall's 

 Mushroom Book, 1902. P. 68. 



Pileus 5-12 cm. broad, at the very first globose, soon convex and ex- 

 panded, often somewhat depressed on disk, firm, dry, as if velvety, the surface 

 (especially the disk) broken into many floccose or pulverulent areas or patches, 

 green or grayish green, the margin not striate or rarely so, a cuticle scarcely 

 distinguishable or separable. Fresh white. Gills ivhite, rather close, 

 narrowed toward the stem, almost or entirely free, few shorter or forked. 

 Stem 3-7 cm. long, 1-2 cm. thick, white, firm, ec^ual or subequal, solid or 

 spongy. Spores white, subglobose, 6-8 micr. Taste mild. Odor none. 



Oak and maple or mixed woods, probably thruout the state. Occasional. 

 July and August. 



Under this name there was included in this country for quite a time a 

 more common form with viscid striate cap which has been segregated by Peck 

 under the name of R. crustosa. The two seem to run into each other at times, 

 but Peck distinguishes the pileus of R. crustosa "by its smooth, not warty 

 centre, its paler color and usually striate margin." It is also distinctly 

 viscid when young, but this depends considerably on the weather conditions. 

 It might be confused with green specimens of R. variata, whose surface is 

 sometimes areolate, but the gills of R. virescens are. not as pure white, are not 

 decurrent nor much forked, and the taste is mild. 



19. Russula crustosa Pk. 



(The crusty Russula.) 



Illustrations: Hard's Mushrooms, 1908. P. 189, fig. 150. N. Y.' State 

 Mus. Bull, 67, 1903. PI. 84, p. 45, fig. 1-7. 

 Pileus 5-12 cm. broad, firm, convex then expanded and depressed in the 

 centre, surface cracked except on disk, the areas crustlike, sordid cream-color 



