NATURAL HISTORY SURVEY 91 



Agaricus placomyces Pk. 



Pileus thin, at first convex, becoming flat with age, whitish, 

 brown in the center and elsewhere adorned with minute brown 

 scales. 



Lamellae close, white, then pinkish, finally blackish-brown. 



Stem smooth, annulate, stuffed or hollow, bulbous, white or 

 whitish, the bulb often stained with yellow. 



Pileus 5 to 10 cm. broad; stem 7.5 to 12.5 cm. long, 6 to 12 

 mm. thick. It grows in the borders of hemlock woods or under 

 hemlock trees from July to September. (Peck.) 



Gregarious on a lawn, Wheaton, after a heavy rain. October, 

 1902. A beautiful plant. Pileus white or creamy-tinted, some- 

 times pinkish, everywhere beset with very small blackish-brown 

 scales, these arranged in more or less concentric rows. The even 

 brown disk is often obtusely umbonate. The cuticle of the pileus 

 is separable and extends beyond the lamellae. The stem is some- 

 times fistulose even before the pileus has expanded. Annulus 

 radiate-lineate and granulose above, loosely floccose below. 

 Spores subelliptical, nucleate, 5 x 4 //.. 



STROPHARIA. 



Hymenophore continuous with the stem; veil annular; lamellae 

 more or less adnate. Spores intense bright purple-brown, brown 

 or slate-color. 



Stem fistulose S. semiglobata. 



Stem stuffed with a separate pith S. stercoraria. 



Stropharia semiglobata Batsch. 



Pileus light yellow, slightly fleshy, hemispherical, not ex- 

 panded, very obtuse, even, viscous. 



Lamellae adnate, very broad, plane, clouded with black. 



Stem fistulose, tense and straight, equal, even, smooth, becom- 

 ing yellow, paler at the apex, black-pruinate with the spores, 

 otherwise smeared with the glutinous veil which is abrupt above, 

 terminating in an incomplete (not membranaceous) viscous 

 distant ring. 



Gregarious in manured ground, Palos Park. May. The 

 pileus and stem are viscid when moist, smooth and shining w T hen 

 dry. Spores somewhat apiculate, 12 to 16 x 7 to 9 p. 



Stropharia stercoraria Fr. 



Pileus yellow, fleshy but thin at the margin, hemispherical 

 then expanded, orbicular, pelliculose-viscous, smooth. 



Lamellae adnate, very broad behind, somewhat crowded, 

 olivaceous-fuscous or umber-fuscous. 



Stem stuffed with a separate white fibrous pith, equal, viscous, 

 yellowish; ring flocculose, not prominent. 



Pileus 2.5 to 3.5 cm. broad; stem 5 to 7.5 cm. high; spores 

 purple-brown, 17 x 13 /x. 



