216 



Mycologia 



Distribution : Temperate regions of North America, south to 

 Virginia and west to California; also in Europe. 



Illustrations : Ann. Rep. N. Y. State Mus. 54: pi. 75, /. 1-13; 

 Cooke, Brit. Fungi, pi. 531 (550) ; Gill. Champ. Fr. pi. 129 (3//) ; 

 Kalchb. Ic. Hymen. Hung. pi. 18, f. 1; Richon & Roze, Atl. 

 Champ, pi. 16, f. 1-6. 



Peck called, attention to this species in his 45th Report, his re- 

 marks being based on specimens collected under hemlocks at 

 Menands, New York. It has since been reported from the United 

 States in localities widely scattered. Kauffman found it infre- 

 quent in certain parts of Michigan, Harper got it in California, and 

 I have it from Brooklyn, New York. It is easily recognized by 

 its quick change to red when any part is bruised or broken in the 

 fresh condition. 



25. Agaricus rubribrunnescens sp. nov. 



Pileus convex to expanded, rather thin, gregarious, reaching 8 

 cm. broad ; surface dry, white, conspicuously ornamented from 

 youth to maturity with slightly reddish scales, becoming reddish- 

 brown when bruised or on drying ; context thin, white, changing to 

 reddish-brown ; lamellae free, narrow, crowded, pink to dark- 

 purplish-brown ; spores ellipsoid, smooth, purplish-brown under 

 the microscope, about 5.5 x 3.5 ft; stipe slender, equal or slightly 

 enlarged at the base, slightly fibrillose, stuffed, white, becoming 

 reddish-brown when handled or on drying, about 5 cm. long and 

 5 mm. thick ; annulus simple, ample, persistent, white to slightly 

 yellowish. 



Type locality : Bronxwood Park, New York City. 

 Habitat : About exposed roots of a living red maple tree on a 

 lawn. 



Distribution : New York City and Long Island. 



The type specimens were collected by me on September 8, 191 6, 

 in my yard, where the plant has appeared for several years. I 

 have it also from two places on Long Island. It differs from A. 

 haemorrhoidarius in its conspicuously scaly surface and smaller 

 spores. 



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