230 FUNGUS-FLOEA. 



from A. constrictus by the longer, thinner stem, and the 

 striate pileus. 



Armillaria mucida. Schrad. 



Pileus 1^-3 in. across, flesh thin and almost diaphanous, 

 hemispherical then expanded, obtuse, often rugulose, glu- 

 tinous, whitish or tinged with grey ; gills rounded behind 

 and broadly adnexed with a line-like decurrent tooth, 

 distant, broad, white ; stem 1^-4 in. long, 3-5 lines thick, 

 base thickest, ascending, glabrous, white but base ofteu 

 with sooty squamules, rigid, stuffed ; ring near apex of stem, 

 white, tumid ; spores elliptical, 1516 X 8-9 /*. 



Agaricus ( Armillaria} mucida, Schrader, Spic., p. 116; Cke., 

 Hdbk., p. 23; Cke., Illustr., pi. 16. 



Very variable in size. Keadily known by the very shiny 

 pileus, which is usually whitish, but sometimes sooty or 

 olive-brown. Solitary or caespitose. 



Armillaria denigrata. Fr. 



Pileus 1-2 in. across, sometimes even more ; flesh not thick 

 but firm, not flaccid, convex then plane, obtuse, slightly 

 viscid when moist, not fibrillose but looking as if covered 

 with minute drops of water due to the presence of elevated 

 warts, dark fuscous-brown; margin always even; gills de- 

 current, rather distant, 1-1^- line broad, at first pale brown, 

 then darker, scarcely powdered with the spores ; stem solid, 

 firm, up to 2 in. long, sometimes equal, ^ in. thick, sometimes 

 rather ventricose near the base and attenuated below the 

 swelling, fibrously striate, pallid fuscous ; dingy within and 

 fuscous towards the base; ring attached near the apex, 

 narrow, entire, readily falling away, paler. 



Agaricus (Armillaria) denigratus, Fries, Yet. Ac. Forh., 

 1861 ; Cke., Hdbk., p. 24. 



On the ground in damp, shady places. 



Gregarious or solitary. The species is considered by 

 Berkeley to be identical with Ag. (Pholiota) erelius. 



'** Gills adnate, not sinuate. 



Armillaria citri. Inzenga. 



Pileus about 1 in. across, flesh thin, convex then plane, 

 rather umbonate, smooth, even, sulphur-yellow, margin 



