48- THE AGARICACEAE OF MICHIGAN 



15. Panus stipticus Fr. (Poisonous) 



Syst. My col., 1821. (As Pleurotus stipticus.) Epicrisis, 1836-38. 



Illustrations: Hard, Mushrooms, Fig. 178, p. 222. 

 Ricken, Blatterpilze, PI. 26, Fig. 3. 

 Michael, Fiihrer f. Pilzfreuude, Vol. 3, No. 66. 

 Gillet, Champignons de France, No. 510. 



PILEUS 1-3 cm. broad, very tough, pale cinnamon, fading to 

 whitish, convex, subreniform, depressed and abruptly narrowed be- 

 hind, surface breaking up into minute, furfuraceous scales, even. 

 GILLS thin, determinate, i. e., abrupt behind, venose-connected, 

 crowded, cinnamon. STEM lateral, short, distinct below, solid 

 often compressed, pruinose, paler than gills. SPORES minute, nar- 

 rowly oblong, 4-5x2 micr., smooth, white. TASTE very astringent. 

 CYSTIDIA none on sides of gills. 



Caespitose. On wood; stumps, logs, trunks, etc. Throughout the 

 state. May to October. Common. 



This little Panus is not edible, because of its toughness and 

 its very disagreeable taste. It is said to be a violent purgative. 

 When fresh it is slightly phosphorescent in a dark room. On the 

 under side it appears to have a very definite stem, ending abruptly 

 at the gills ; above, the stem is not distinguishable. It revives when 

 moistened, so that a cluster may be seen in place during the whole 

 season. 



16. Panus angustatus Berk. 



Lea's Catalogue of Plants, 1819. 



See also Pleurotus stratosus Atk.=syn, Jour, of Mycol., Vol. 8, 

 1902. 



PILEUS 2-5 cm. broad, obovate to broadly cuneate, sessile or pro- 

 longed into a stem-like base, convex or depressed, sordid white to 

 pale tawny, trama composed, under the microscope, of four layers 

 (a) the surface layer of erect hyphae which form a minute tomen- 

 tum ; beneath this (b) a thin, compact layer; (c) a gelatinous layer 

 of open, slender, distant, palisade threads; (d) a compact, floccose- 

 interwoven layer, about half the thickness of the pileus; margin 

 crenate-wavy. FLESH thin, tough, soft. GILLS converging, very 

 narrow, crowded, white or yellowish. SPORES minute, spheroid- 

 oval, 3 micr. diani., smooth, white in mass. CYSTIDIA numerous, 

 fusoid or lanceolate, 45-60x10-14 micr. BASIDIA 4-spored. 



