334 THE AGARICACEAE OF MICHIGAN 



later. Dr. Peck referred it to its proper position. G. vibratilis 

 is distinguished by its pure white stem, pallid gills and yel- 

 low cap; the last may take on fulvous or rufous brown 

 lines on the disk. An occasional individual of larger di- 

 mensions occurs. The stem varies in length and shape, and 

 in mossy wet places often becomes more elongated. The 

 "lnti'ii often drips from the edge of the cap in moist weather and 

 on drying the cap becomes shining. This species might be confused 

 with G. causticum Fr., unreported in Michigan, in which only the 

 viscid pellicle of the pileus is bitter. Two other European species, 

 C. emollitus Fr. and G. crystallinus Fr. possess bitter flesh and some- 

 what similar colored caps, but they belong to the subgenus Fhleg- 

 niacium and their stems are not pure white. 



315. Cortinarius sterilis Kauff. 



Torr. Bot; Club Bull., Vol. 32, 1905. 



Illustrations: Ibid, Fig. 1, p. 304. 



dour, of Mycol., Vol. 13, PI. 96, p. 30, 1907. 

 Mycol. Bull., Vol. 5, Fig. 242, p. 310, 1907. 



PILEUS 1.5-4.5 cm. broad, suborbicular when young then convex- 

 expanded, margin incurved, drab, drab-gray to olive buff, even, 

 smooth, viscid, somewhat umbonate at times. FLESH white, soft, 

 thin. (JILLS relatively broad, 4-6 mm., drab-gray at first, then light- 

 cinnamon, rounded behind, then emarginate, not at all ventricose, 

 rather crowded, edge serratulate and white, later eroded, provided, 

 with sterile cells. STEM 4-8 cm. long, 4-0 mm. thick, at base up to 

 10 mm., clavate or tapering upward, solid, spongy, or tapering up- 

 ward, dingy-white, tinged with light blue toward apex, clothed 

 when fresh with the delicate patches of the viscid, universal veil, 

 which is of the same color as the pileus, within pale bluish at apex, 

 white below. SPORES subsphoeroid, almost smooth, 6-7x5-6.5 

 micr. CORTINA white or sordid. 



Gregarious in swamps of cedar, etc. Bay View. August-Septem- 

 ber. Rare. 



The spores and the peculiar color of cap and veil distinguish this 

 species. It has been found only twice, in low, wet, sphagnous or 

 mossy swamps. Its name refers to the sterile cells on the edge of 



the gills. 



