144 C. H. Kauffman 



It belongs to the section Tenaces. A very distinct plant, 

 whose pileus remains unexpanded and on drying in situ becomes 

 radially undulate-plicate, its margin closing in on the stem. 

 The stem is distinctly sticky to the tongue, indicating an outer 

 veil continuous with the pellicle of the pelius. At first and for a 

 time, the cortinate covering gives the stem the appearance of 

 being white. 



Psilocybe olivaceotincta, sp. nov. ^ — Pileus 1.5-3 cm. broad, 

 fragile, at first obtusely campanulate, then expanded to plane, 

 hygrophanous, "citrine-drab" (R.) and faintly striatulate when 

 moist, "olive-buff" or "pinkish-buff" and atomate when dry, 

 glabrous, margin at first incurved, flesh thin, .5-1 mm., con- 

 color. Gills broadly adnate, close to subdistant, thin, rather 

 broad, at first "pale olive buff," then "citrine drab" (R.), edge 

 very entire. Stem 3-5 cm. long, 1.5-2.5 mm. thick, equal or 

 tapering downwards, toughish, becoming rigid-brittle, "cinna- 

 mon-rufous" upwards, "chestnut brown" downwards, glabrous 

 except the minutely scurfy apex, concolor and minutely tubular 

 within. Odor and taste none. Spores elliptical, smooth, 10-12 

 X 5-6 IX, distinctly purple-brown under the microscope; cystidia 

 none; sterile cells on edge of gills, filiform, cylindrical, hyaline, 

 3-4 /z diameter; trama of pileus homogeneous. 



On moist thick humus and rotten debris in conifer forest. 

 Mt. Hood, Oregon, October 6. Collected by C. H. Kauffman. 



Sharply distinct by the contrasting colors of pileus and stem. 



RUSSULA BOREALIS Kauff. RUSSULA PECTINATOIDES Pk. 



RussuLA DELicA Fr. RussuLA Raoultii Burl. 



RuSSULA EMETICA Fr. RuSSULA SUBOLIVASCENS Burl. 



Russula expallens Gill. Russula xerampelina Fr. 



RussuLA fallax Cke. Stropharia ambigua (Pk.) Zel- 

 Russula flava Romell ler 



Russula Murrillii Burl. Stropharia stercoraria Fr. 



Stropharia fragilis, sp. nov. (See Plate XII.) — Pileus very 

 fragile, 3-7 cm. broad, at first subhemispherical then campanu- 

 late-expanded, obtuse, at length plane-subrepand, very hygroph- 

 anous, "army-brown" to "wood brown" (R.) and striatulate on 



