741 THE AGARICACEAE OF MICHIGAN 



789. Clitocybe ditopoda Fr. 



Syst. Myc, 1821. 



Illustration: Cooke, 111., PL 116. 



PILEUS 2-5 cm. broad, convex then subexpanded and umbilicate- 

 depressed, pliant, glabrous, even, hygrophanous, cinereous or gray- 

 ish-brown (moist), dull white (dry), margin somewhat irregular. 

 FLESH thin. GILLS adnate or scarcely subdecurrent, crowded, 

 rather narrow, pallid at first, soon cmcrasccnt and smoky-gray, 

 edge entire. STEM 2-3 cm. long, 3 mm. thick, terete or more often 

 compressed, irregular, pale cinereous, stuffed soon hollow, pruinose 

 downwards. SPORES elliptic-ovate, 5-6 x 3-4 micr., smooth, white. 

 CYSTIDIA none. ODOR and TASTE farinaceous. 



Gregarious or subcaespitose. On the ground, among needles and 

 debris of tamarack trees in wet swamp. 



Ann Arbor. October-November. Infrequent. 



This species was abundant in this one locality. It has much in 

 common with C. metacliroa , but differs from it in the farinaceous 

 odor and in the different color changes in passing from the young 

 to the old stage. The plants also do not have the stiff appearance 

 of C. metacliroa. 



790. Clitocybe peltigerina Pk. 

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



PILEUS 4-10 mm. broad, small subexpanded, umbilicate, hygro- 

 phanous, grayish-brown and striatulate when moist, whitish to pale 

 gray when dry, glabrous. GILLS decurrent, distant, narrow, some- 

 what forked and intervenose, grayish-brown, thickish, pruinose. 

 STEM 1-2 cm. long, 1.5 mm. thick, equal, solid, elastic, pallid or 

 tinged grayish-brown, pruinose below, base minutely tomentose. 

 SPORES elliptical-ovate, pointed-apiculate. 8-10x4-5.5 micr.. 

 smooth, white; basidia 4-spored; cystidia none. ODOR and taste 

 none. 



Singly or subcaespitose. On Peltigera, one of the lichens. Ann 

 Arbor. May 5. Rarely found. 



Remarkable for its habitat. It is small and imitates the color 

 of its substratum and is easilv overlooked. 



