REPORT OF THE STATE BOTANIST I909 43 



where wounded, then to brown or black, annuliis thick, persistent, 

 white; spores subglobose or ellipsoid, 5-7 x 4-5 ,". 



Pileus 2.5-10 cm broad; stem 2.5-7 cm l° n g> 4~8 mm thick. 



Cespitose or single, often in clusters of many individuals. On 

 dumping ground near Trenton, N. J. September. E. B. Sterling. 



The pileus closely resembles that of A g a r i c u s p 1 a c o m y - 

 c e s Pk., but the mushroom differs in its commonly tufted mode 

 of growth, the darker color of its mature pileus, the thicker and 

 more persistent annulus, the distinct hollow tube of the stem and 

 specially in the change of color of the wounded flesh and stem. 

 It is also closely allied to A g a r i c u s approximans Pk. 

 from which it may be separated by its lamellae becoming pink 

 before they assume the brown color of maturity. The discoverer 

 pronounces it edible but says its flavor is less agreeable than that 

 of Agaricus campester L. 



Pileus tenuis, ovatus, late conicus seu subcampanulatus, aliquando 

 late expansus. quum juvenis brunneus deinde albidus, squamulis 

 brunneis fibrillosis tectus, centro glaber, brunneus, margine juvene 

 lamellas excedente, carne alba, ubi vulnerata rufescente ; lamellae 

 tenues, confertae, angustae, liberae, albidae, mox incarnatae, deinde 

 nigro-brunneae ; stipes firmus, subaequalis, aliquando basi incras- 

 satus saepe leviter bulbosus, fibrosus, sericeus, albus, tuba cava farc- 

 tus. carne alba, ubi vulnerata sanguinea, deinde brunnea vel nigra, 

 annulus crassus, persistens, albus ; sporae subglobosae vel ellipsoi- 

 deae, 5-7 x 4-5 r . 



Russula blackfordae 



PLATE Z. FIG. 9-I3 



Pileus fleshy but thin, broadly convex or nearly plane, viscid 

 when moist, striate on the margin, whitish or pale gray, brown in 

 the center, flesh white, taste mild; lamellae thin, narrow, close, ad- 

 nate. pale yellow or cream color; stem equal, glabrous, stuffed or 

 hollow, Avhite ; spores pale yellow, globose. 8-9 p. broad. 



Pileus about 2.3 cm broad; stem about 2.5 cm long. 4-6 mm 

 thick. 



Ellis, Mass. October. Airs E. B. Blackford. 



This species differs from Russula f a 1 1 a x ( Schaeff.) Sacc. 

 in the color of the pileus, the closer and yellowish lamellae, the 

 mild taste and the color of the spores. The viscid pellicle of the 

 pileus is separable. The species belongs to the section Fragiles, 

 second subsection. - 



