SI BS1 CTIOh HYGROCYBE 1 17 



cystidia arc its outstanding microscopic character, These have been 



found in all of the material examined, and are nsiialK abundant. 



51 



Hygrophorus auratocephalus (Ellis) Murr. 



Mycologia 9: 40. 1917 



Agaricus auratocephalus Ellis, Torre) Hot. ( Hub Hull. (■>: 75. L876. 

 Cutocybe auratocephala (Ellis) Sacc., S\ II. Fung. 5: 1 ( J<>. L887. 

 Camarophyllus auratocephalus (Ellis) Murr., North Amer. Flora ( J: 



387. 1916. 

 Tricholoma auratocephalum (Ellis) Singer, Lilloa22: 221. L951. 



Pileus 3-5 em broad, at first obtusely conic, then campanulate and 

 conspicuously umbonate, sometimes expanded and with a low obtuse 

 umbo, colors brigbt yellow fading to pale yellow ("cadmium yellow," 

 "deep chrome," or "yellow ocher" when moist, paler when faded), sur- 

 face glabrous and slightly viscid when moist, pellicle subseparable, 

 subhvgrophanous and soon dry, young pilei appearing faintly innately 

 silky, in age rimose or splitting radially along the elevated even mar- 

 gin. Context uniformly thin, fragile, yellow fading to white; odor strong 

 (especially when drying) or slight, rather penetrating and mephitic, 

 taste slightly disagreeable. 



Lamellae broadly adnate with a triangular decurrent tooth, "capu- 

 cine yellow" to "cadmium yellow" when fresh (not golden yellow), 

 ventricose, very broad (up to 10 mm), subdistant to distant. 



Stipe 7-10 cm long, 5-7 mm thick at apex, 2-3 mm thick at the 

 base, "mustard vellow" (pale bright vellow) over all or whitish at the 

 base, terete, strict, subfragile, hollow. 



Spores 7-9 X (4)4.5-6 fx, ellipsoid to subovoid, smooth, pale yellow 

 in Melzer's reagent. Basidia 36-50 X 5.5-8 /x, 4-spored. Pleurocvstidia 

 and cheilocystidia none. Gill trama subparallel to slightly interwoven, 

 yellowish in iodine. Pileus trama homogeneous beneath a thin gelati- 

 nous pellicle, all parts yellowish in iodine. Clamp connections rare on 

 the cuticular hyphae. 



Habit, Habitat, and Distribution — On soil or on moss in swamps, 

 usually under conifers, New Jersey, Pennsylvania, and Michigan, fuly- 

 September. 



Material Studied — Michigan: KaufTman, Rock River, Sept. 22, 

 1929. new jersey: Ellis 3033 (type from swamp, Newfield, July 28, 

 1876; from the collection data, it is probable that this is the type 

 1776, Ellis & Everhart, N. A. Fungi No. 1911. 



Observations — Notes on Ellis' collection 3033 ( type ? ) : Spores 



