122 THE AGARICACEAE OP MICHIGAN 



(cc) Gills close or crowded. 



(d) Gills etc. becoming reddish then black; gills crowded. 101. 



R. densifolia Seer, 

 (dd) Gills etc. becoming bluish-black, not at first red; pileus dry. 

 103. R. sorclida Pk. 

 (AA) Gills mostly equal, sometimes with shorter ones scattered pro- 

 miscuously, 

 (a) Gills dichotomously forked throughout; pileus dull pink to pur- 

 plish when young, later olivaceous, or greenish-umber. 116. R. 

 variata Bann. 

 (aa) Gills forked only at the base, or forking not extensive or lack- 

 ing, 

 (b) Spores white in mass. 



(R. acruginea, R. foetentula, R. rosacea, R. mariae and R. sub- 

 punctata have creamy-white spores). 

 (c) Pileus white. 



(d) Taste acrid. 133. R. albidula Pk. 

 (dd) Taste mild. 



(e) Pileus viscid, sometimes tinged yellowish; remaining 



white when dried. 139. R. albida Pk. 

 (ee) Pileus dry, sometimes tinged pink. 133. R. albella Pk. 

 (cc) Pileus some shade of green or dingy greenish-white. [See 

 also (ccc)]. 

 (d) Pileus with a continuous separable pellicle; taste mild. 



120. R. aeruginea Lindb. 

 (dd) Pellicle adnate, becoming pulverulent or areolate-cracked ; 

 gills close, 

 (e) Pileus dry, dark green when young, substriate on margin. 



105. R. virescens Fr. 

 (ee) Pileus viscid, glabrous on disk, mouldy-white to pale 

 greenish-white, striate on margin. 106. R. crustosa Pk. 

 (ccc) Pileus some shade of red, pink, purple or bluish. [See 

 also (cccc)]. 

 (d) Taste mild, 

 (e) Gills floccose-crenulate on edge; pileus viscid, shining 

 blood-red; stem tinged red. 141. R. purpurina Q. & S. 

 (ee) Edge of gills not crenulate. 

 (f) Pileus firm and hard, or compact; pellicle adnate or 

 disappearing in places, 

 (g) Pileus pruinose-velvety, dark red, or purple-red; stem 

 rosy or dark red; gills at length dingy cream-color. 

 119. R. mariae Pk. 

 (gg) Pileus not markedly pruinose. 

 (h) Pileus 5-10 cm. broad. 



(i) Pileus pale bluish-purple, at length rosy to white 

 on disk, viscid, stem white. 117. R. cyanoxantha 

 Fr. var. 

 (ii) Pileus pale red, soon dry, unpolished; stem rosy- 

 tinged or white; taste rarely slightly acrid. 108. 

 R. lepida Fr. 

 (hh) Pileus 3-6 cm. broad, 

 (i) Pileus dull lilac-purplish. R. lilacea Quel, 

 (ii) Pileus incarnate to pale livid pink. 114. R. 

 vesca Fr. 

 (ft - ) Pileus rather thin, fragile or subfragile. 



(g) Pileus usually 2-4 cm. broad, clear pink; in oak woods. 



142. R. uncialis Pk. 

 (gg) Pileus 4-6 cm. broad, dark violet-purple or purplish- 

 red, silky-shining, in conifer woods. 143. R. seri- 

 ceoniteus Kauff. 

 (ggg) Pileus 6-12 cm. broad, bright rose-red with yellowish 

 spots; stem white. 140. R. subdepallens Pk. 

 (dd) Taste very acrid. 



