CLASSIFICATION OF AGARICS 301 



seems desirable thai the two species be more carefully studied. I 

 have aever found a plant in Michigan which could be referred to 

 /'. squarrosa, bu1 Harper bas illustrated collections from Frankfort, 

 Michigan, under the latter name. 



291. Pholiota albocrenulata Pk. 



\. V. siate Mhs. Rep. 25, L873. 



illustration: Harper, Wis. Acad. Sci. Trans., Vol. IT. PL L2 and 

 13. 



PILEUS 3-12 tin. or more broad, firm, broadly conves or cam pan- 

 ulate, often anbonate, very viscid, orange-fulvous, becoming ferru- 

 ginous-tawny in age, spotted icith superficial, darker, fibrilU 

 scales which become whitish <<» drying, margin even ami at length 

 reflexed, often appendiculate. FLESH thick, whitish. GILLS 

 adnate, becoming sinuate and rounded behind, m// broad, cl< 

 whitish at first, then grayish, ai Length rusty-umber, edge crenulaU 

 mid beaded with white drops. STEM 5-15 cm. long, 5-10 mm. thick, 

 firm, equal or tapering slightly upward, stuffed by a louse pith, Boon 

 hollow, dingy whitish or ochraceous, covt red with squarrose, brown 

 scales up to the fugacious A.wrus. apex pruinose and white. 

 SPORES ventricose-subfusiform, inequilateral, Ll-14 x 5.5-6.5 micr., 

 smooth, rusty-umber. CYSTIDIA none. 



Solitary, or two or three in a cluster. Mostly growing oul of a 



eiaek or wound of living trees, towards the base Of the trunk; on 



living sugar maple, yellow lurch ami hemlock. July-September. 

 Frequent in the Northern Peninsula, rare in southern Michigan. 



'Phis fine plant prefers the sugar maple, and may yet be found 

 to be injurious to the Living trees, as it has the characteristic habil 

 of parasitic mushrooms. Peck and Harper report it on prostrate 

 trunks ami decaying wood, inn 1 have always found it on Living 

 trees. Morgan also reports ii from <>hio on the base of Btanding 

 maple trees. The white-headed edge of the gills, the peculiar scales 

 ami large spores distinguish it. The spores average longer than 

 noted by Peck, although they vary considerably in length. The 

 pileus may attain to quite large dimensions. Its edibility i- un- 

 known. 



