PI^EUROTUS. 53 



P. atrocoeruleus. Fr. Black-blue Agaric. 



This specimen is rather rare. 



Pileus, thin, one half to three-fourth inch, obovate, reni- 

 form, plane depressed, smooth, grayish-blue. 

 Gills, determined, distant, grey. 

 Stem, marginal, short, distinct. 

 Found species growing on mulberry trunk. 



P. OStreatUS. Fr. The Oyster Mushroom. 



Pileus, two to four inches broad, soft, convex or slightly 

 depressed behind, subordinate, often csespitosely imbricated, 

 moist, glabrous, whitish cinereous or brownish, flesh white. 



Gills, broad, decurrent, subdistaut, anastomosing at the 

 base, white or whitish. 



Stem, when present, very short, firm, lateral, sometimes 

 strigose, hairy at the base. 



Spores, oblong, white, .0063 to .0004 inch long, .00016 

 broad. — Peck' s Report. 



This species is frequently mistaken for the sapidus. They are so 

 similar in external appearance that the only character is the pinkish 

 spores on white paper. For many years I took the sapidus for this 

 species. It was only after getting at the spores on white paper that I 

 determined its proper place. It is scarce in Lehigh County. The only 

 locality is on an elm stump. Spring Creek woods. 



Series II. HYPORHODII or RHODOSPORJ^. 



Spores salmon or pink color. 



The genera under the pink-spored Agaricini are arranged in 

 the same manner as the preceding white-spored series. They 

 are not near so abundant as the preceding species. The gills 

 are at first white, but soon turn to the pink color of the spores. 



The term is derived from Hypo, diminutive, Rhodos, rose. 



