THE AGARICACEAE OF MICHIGAN 



538. Pluteolus reticulatus Fr. 



Syst. My.-.. L821. 



Illustrations : Cooke, 111.. PI. 195. 



Gillet, Champignons <le France, No. 516. 

 Berkeley, Outlines, PL 9, Fig. 5. 

 Ricken, Bliitterpilze, PI. 23, Fig. 10. 

 Plate CXIX of this Report. 



PILEUS 2-5 cm. broad, campanulate-expanded, obtuse, some- 

 limes slightly depressed, glutinous when fresh, the gluten drying 

 so as to form reticulate reins, radiately-rugose on disk, violaceous- 

 gray when fresh, livid to blackish on disk, margin obscurely striate, 

 very pale in age. FLESH rather thin. GILLS almost free or 

 narrowly adnate, rounded behind, seceding, crowded, ventricose, 

 moderately broad, whitish at first, then rusty-cinnamon, edge white- 

 fimbriate. STEM :'>-<; cni. long, 2-6 mm. thick, equal or slightly 

 tapering upwards, clastic, toughish, while, minutely floccose-scaly, 

 fibrillose-striatulate, hollow, straight or curved. SPORES ellip- 

 tical, smooth, 9-11x5-6 micr., rusty-brownish. ODOR none. 



Caespitose or subcaespitose. Around the baae of stumps and 

 standing trees, on decayed wood. Ann Arbor. .October. Rare. 



When fresh the plants are markedly tricolored; pileus deep gray 

 with violet tinge, gills rusty-cinnamon and stem white. Later the 

 color of the pileus fades somewhat as in the plates referred to above, 

 .ill of which show the cap much decolorized. The gills of our 

 specimens depart somewhat from the character of the genus in 

 being narrowly adnate; on this account it was at first referred by 

 the writer to Naucoria. Ricken places it under Bolbitius because of 

 the structure of the gills. In our plants the gills showed no sign of 

 diss,, hin- or becoming soft under the weather conditions in which 

 they were collected. 



Naucoria Fr. 



i Prom the Latin, Yaucum, a nut-shell, referring to the shape of the 



pileus. i 



Ochre-brown or rusty-brown-spored. Stem subcartilaginous, hol- 

 low or stuffed. Partial veil none or fugacious. Pileus slightly 

 fleshy, convex, its margin at first incurved. Spores smooth. 



Putrescent, terrestrial or lignicolous, usually small, sometimes 



