64 THE CHICAGO ACADEMY OF SCIENCES 



Marasmius oreades Bolt. 



Pileus fleshy, tough, convex then plane, somewhat umbonate, 

 glabrous, expallent. 



Lamellae free, broad, distant, white-pallid. 



Stem solid, equal, the cuticle villous-interwoven, pallid, the 

 base naked. Somewhat fragrant. 



Pileus 2 to 3.5 cm. broad; stem 6.5 to 9 cm. long. 



" Growing in circles and series throughout the summer. It 

 is famous for the rich flavor it imparts to soups and gravies. 

 When dried it may be kept for years without losing any of its 

 aroma or goodness." Morgan. 



The species has been reported from the Chicago region by 

 several collectors. I have not found it here. It is the famed 

 "Fairy-ring mushroom." 



Marasmius dichrous B. & C. 



Pileus convex, dark brown, clothed with close matted down, 

 sometimes appearing velvety. 



Lamellae at first adnate, separating from the stem, and some- 

 times leaving a naked area around it, moderately distant, ventri- 

 cose, interstices nearly even. 



Stem brown, clothed with furfuraceous down, base slightly 

 dilated, villous. 



Spores white; pileus 2.5 cm. or more across; stem 2.5 to 3.5 

 cm. long, scarcely 2 mm. thick. 



On dead leaves in woods. August. In the plants so referred 

 the furfuraceous coating of the stem is whitish. The interspaces 

 between the lamellae are usually even, but occasionally venose. 

 The spores are elliptical or slightly pip-shaped, 7 to 8 x 4 to 5 /*. 



Marasmius longipes Peck. 



Pileus thin, convex, smooth, finely striate on the margin, 

 tawny-red. 



Lamellae not crowded, attached, white. 



Stem tall, straight, equal, hollow, pruinose-tomentose, radi- 

 cating, brown or fawn-color, white at the top. 



Pileus 8 to 12 mm. broad; stem 5 to 12.5 cm. long, about 1 

 mm. thick. 



On dead leaves and twigs in woods, Glen Ellyn. June to 

 August. Spores broadly subpyriform, or elliptical and slightly 

 pointed at one end, 6 to 7 x 3 to 4 /A. 



Marasmius pyrocephalus Berk. 



Pileus a little fleshy, convex then plane, umbilicate, plicate- 

 striate, red-brown. 



Lamellae adnate, lax, rather distant, somewhat ventricose, 

 white then pallid. 



Stem hollow, densely velvety, brown, pale at the apex. 



Pileus 1.3 to 2.5 cm. broad; stem 5 to 6.5 cm. long. 



