252 THE AGARICACEAE OF MICHIGAN 



ally according to Rieken, by the presence of cystidia which occur also 

 on the sides of the gills and which are absent in S. semiglohata ex- 

 cept on the edge. The pileus of the latter is more persistently hemis- 

 pherical. A sterile form has been observed, in every particular like 

 the above, except that the gills remained pale yellow or straw- 

 color; spores were lacking at full expansion of the pileus and the 

 hymenium was composed of large, inflated, sterile cells in place 

 of the basidia. 



242. Stropharia semiglobata Fr. (Edible) 



Syst. Myc, 1821. 



Illustrations: Cooke, 111., PL 539. 



Gillet, Champignons de France, No. 651. 

 Patouillard, Tab. Analyt, No. 234. 

 Rieken, Blatterpilze, PI. G3, Fig. 2. 

 Atkinson, Mushrooms, Fig. 30, p. 31, 1900. 

 Hard, Mushrooms, Fig. 2G0, p. 320, 1908. 

 Murrill, Mycologia, Vol. 4, PI. 56, Fig. 3. 



PILEUS 1-4 cm. broad, persistently hemispherical, very viscid 

 from the pellicle, glabrous and naked, even, citron-yellow, shining 

 when dry, faded in age, stained purplish-black by spores. FLESH 

 thick on disk, thin on margin, pallid, soft. GILLS broadly adnate, 

 very broad, close to subdistant, olive-gray to purplish-brown, clouded 

 blackish, edge minutely white floccose. STEM 5-12 cm. long, 2-5 

 mm. thick, subequal or cylindrical, straight, hollow, rigid, often 

 viscid when young or fresh, covered below up to the narrow annulus 

 by the thin, membranous, flocculose veil. SPORES elliptical, 15-18 

 x 9-10 micr., smooth, violet-purple under the microscope, brownish- 

 purple in mass. CYSTIDIA only on edge of gills, short-filamentous, 

 30-45 x 3-4 micr. (Rieken.) 



On dung hills and grassy places in the open. Probably through- 

 out the State. May-October. Frequent. 



See notes on the preceding. 



243. Stropharia umbonatescens Pk. (Suspected) 



N. Y. State Mus. Rep. 30, 1878. 



Illustrations : Harper, Wis. Acad. Sci. Trans., Vol. 7, Pt. II, PI. 

 65, B. 

 Plate LI of this Report. 



