262 THE AGARICACEAE OP MICHIGAN 



at ends, purplish-black in mass, pale under microscope. CYSTIDIA 



none. 



On very decayed wood, or logs in mixed woods of hemlock and 

 beech, etc. Bay View, New Richmond. August-September. In- 

 frequent. 



This striking little Hypholoma is known by its tinge of dark wine- 

 color mixed with umber, the purplish watery juice of the stem and 

 the minute spores. The trama of the gills and pilens is composed 

 of large, inflated cells, 75-90 x 20 micr., and the surface layer of the 

 pileus of globose cells, several rows thick, up to 30 micr. diameter, 

 tinged smoky vinaceous. When fresh and young it is provided 

 with a thin, evanescent veil, which sometimes forms a slight ring- 

 on the stem, and which soon disappears. It has no relationships 

 to such plants as Lepiota haematosperma (Ft.) Bres. and Armillaria 

 haematites Berk. & Br. which are much stouter plants, have 

 whitish or red-tinged spores, and well developed annulus. It ap- 

 proaches more closely PsaUiota echinata Ft., but the gills are not 

 free, and the trama is composed of larger cells. The pileus never has 

 pointed scales, and is differently colored. The base of the stem is 

 slightly bulbous. 



--■'Pileus glabrous, rugose, not hygrophanous. 



251. Hypholoma rugocephalum Atk. (Probably Edible) 



Mushrooms, 1900. 



Illustration : Ibid, PI. 8, Fig. 29, opp. p. 30. 



PILEUS G-10 cm. broad, convex-expanded to plane, the margin 

 at length elevated, broadly umbonate, strongly radiatcly rugulose, 

 moist or snbviscid, glabrous, watery brown to tawny, then alutaceus- 

 tan. FLESH thick on disk, thin on margin, tinged yellowish. 

 GILLS adnate, seceding, rounded behind or sinuate, moderately 

 close, rather broad, 5-7 mm., black-sprinkled, edge white-fimbriate. 

 STEM 8-12 cm. long, 6-10 mm. thick, equal, snbbnlbons, even, glab- 

 rous, hollow, concolor below, paler above, snbannnlate by obscure 

 threads of the veil, marked by the blackish stain from the spores. 

 SPORES 9-11 x G-8 micr., ventricose-elliptical, abruptly pointed at 

 both ends, minutely tuberculate, inequilateral, dark purple brown, 

 black in mass. CYSTIDIA on sides of gills cylindrical, enlarged at 

 apex, clustered, hyaline: on edge narrowly flask-shaped. ODOR and 

 TASTE mild. 



