64 ELEVENTH REPORT. 



(bb) Spores and gills becoming some shade of ochre, yellow, or cream-color. (Spore prints 

 necessary.) 

 (c) Stem whitish, changing to ochraceous-brown where bruised or handled; odor 

 disagreeable in age. Color of pileus purple, red, olivaceous, etc., very variable. 

 16. R. squalida Pk. (Syn. R. atropurpurea Pk.) (See also R. xerampelina Fr.) 

 (cc) Stem not with this peculiarity, 

 (d) Pileus some shade of red. 

 (e) Taste acrid. 



(f) Pileus rigid, poliShed-.slippery, mostly dry. pellicle hardly dis- 

 tinguishable; color dark red; very acrid'. 9. R. lubra' Fr. 

 (ff) Pileus with a distinct and separable pellicle, bright or rosy-red. 

 (g) Gills cream or straw-color; margin of pileus even; firm. 



37. R. veternosa Fr. etc. 

 (gg) Gills ochraceous-yellow; margin striate; fragile gills and pileus. 



38. R. tenuiceps sp. nov. 

 (e) Taste mild. 



(f) Stem and gills becoming a translucent honey-vellow with age, 



fragile; small. 47. R. puellaris Fr. 



(ft) Stem becoming ashy or blackish. 65. R. obsnira Rom. 



(fff) Stem not like the preceding, 

 (g) Plants large. 



(h) Plants usually large, solitary; pileus dingy or dull red or 

 purplish, often faded; young gills ochraceous; firm. 



13. R. alutacea. Fr. 

 (hh) Plants medium large, pileus dark violet -purple or red; 

 young gills yellow at maturity, du.sted by the "bright 

 ochraceous-buff '' spores; firm.' 11. R. ochrophyUa Pk. 

 (hhh) Plants often in troops; pileus dull and various' in color, 

 not rosy-red; young gills white, becoming cream or 

 ochraceous from the spores; context softer tlian in the 

 preceding; fragile. 46. R. Integra Fr. and forms. 

 (gg) Plants small. 



(h) Gills and spores truly ochraceous; stem slender; fragile, 

 (i) Stem rosy-dusted; pileus rose-red. 



(k) Pileus plane. 49. R. roseipe.s (Sec.) Bres. 



(kk) Pileus unbonate. 48. R. sphagnophilu sp. nov. 

 (ii) Stem white; pileus pinkish, red, lilac, etc., fading to 

 yellowish. 50. R. chamaeolentinus Fr. 



(hh) Gills and spores pale yellowish, cream color, or ochraceous. 

 (i) Pileus firm, red, with a whitish pruinose bloom; slightly 



acrid or mild. 14. R. Mariae Pk. 



(ii) Pileus not with a pruino,se bloom. 



(k) Under balsam trees; pileus not uniformly red. 



51. R. ahtetitui Pk. 

 (kk) On the naked ground, in woods, pileus very small, 

 red. 52. R. pusilla Pk. 



(dd) Pileus some shade of green or olivaceous, sometimes with purple. 



(e) Stem tinged red; pileus firm, varying purple, brownish, etc., gills cream 



color. 15. 7?. xerampelina Fr. 



(ee) Stem white; pileus olivaceous, no purple present. 25. R. olivascens Fr. 

 (ddd) Pileus some shade of yellow, orange, whitish, etc. 

 (e) Flesh of stem cinereous when old. 



(f) Pileus orange-red, large, becoming paler in age. 



54. R. dccoloi-ans Fr. 

 (ff) Pileus "flavus" (Sacc), color not changing, hardly viscid. 



53. R. ttava Rom. 

 (ee) Flesh not becoming cinereous. 



(f) Edge of gills ^■ivid lemon-yellow. 56. R. aurata Fr. 



(ff) Edge of gills concolor. 



(g) Taste mild; plant small to medium; gills egg-3'ellow. 



57. K. lutea Fr. 

 (gg) Taste tardily acrid. 39. R. aurantialutea sp. nov. 



I. COMPACTAE. (LACTARELIS Earle.) 



The compact, thick flesh, the even margin of the pileus wliich is incurved 

 when young and the sets of shorter gills which alternate regularly with those 

 which run from margin to stem, are the characteristics of this subgenus. 

 They have the appearance of large Lactarii. There is no pellicle. 



1. RuSSULA DELICA Fr. 



(The coarse white Russula.) 



Illustrations: R. hrevipes Pk. N. Y. State Mus. Rep. 54. 1900. PI. 



71, Fig. 1-5. 



Pileus large, 10-15 cm. broad, fleshy, firm, convex then umbilicato-de- 



pres:ed to infundibuliform, dull white, sometimes stained rusty-brown, 



