308 



THE AGARICACEAE OF MICHIGAN 



Subcaespitose. On decaying log of white oak. Ann Arbor. Sep- 

 tember. Hare. 



Has the stature of P. aeruginosa, but the scales and colors differ. 

 Our plants have pointed tuberculate scales on the disk of the pileus 

 at first, and the stem does not remain solid. 



301. Pholiota aeruginosa Pk. 



N. Y. State Mus. Eep. 43, 1890, Bot. ed. 

 Illustration : Plate LXII of this Report. 



PILEUS 3-5 cm. broad, hemispherical or convex, obtuse, -firm, 

 subglabrous to scaly, the scales erect, pointed and mostly on the 

 disk, often areolate cracked, dry, varying in color, dark green, green- 

 ish or fulvous-yellow blotched with green, the scales darker when 

 present, margin incurved at first, often adorned with fragments of 

 the veil. FLESH whitish, tinged green, thin except on disk. 

 GILLS adnate and rounded behind at first, then emarginate with 

 decurrent tooth, broad, close, yellowish at first, becoming bright 

 orange-ferruginous, edge entire. STEM short, 34 cm. long, 4-8 mm. 

 thick, equal or tapering at base, straight or curved, tough, cortex 

 subcartilaginous, fibrillose, sulcate-striate at apex, colored like 

 pileus below the lacerate, submembranaceous, fugacious ANNULUS 

 whose remnants are soon colored by bright ferruginous spores. 

 SPORES 6-8x3-4.5 micr., subelliptical, smooth, copious, bright 

 ferruginous. CYSTIDIA none. 



Solitary or gregarious. On old railroad ties, board-walks, old 

 logs in woods, etc. Throughout the State; Ann Arbor, New Rich- 

 mond and Marquette. June and September. Infrequent. 



Like Lentinus lepideus, this Pholiota frequents railroad ties and 

 other wood exposed to the light. It is a well-marked species and 

 was found on several occasions about Ann Arbor. The colors are 

 sometimes very striking, since the dark green of pileus and stem 

 contrast sharply with the bright ferruginous gills and ring, while 

 the apex of the stem is at the same time of a rosy hue. A study 

 of a number of collections shows that there is considerable varia- 

 tion in color, as well as in the character of the surface of the pileus, 

 so that Peck's description had to be revised considerably. It is 

 one of our few green mushrooms and must not be confused with 

 Stroph aria aeruginosa. 



