256 SECTION HYGROPHORUS 



Context white, no color change on bruising, fairly soft; odor distinctly 

 aromatic, taste not distinctive. 



Lamellae broadly adnate to decurrent, close to subdistant, narrow 

 to broad, white and clean at first, soon flushed salmon-buff, edges even. 



Stipe 4-9 cm long, (3)8-12 mm thick, equal or tapered at the 

 base, white, flavescent, fibrillose-punctate to scabrous at apex, lower 

 two-thirds covered by a gelatinous sheath representing the gluten, with 

 a thin inner white-fibrillose veil; lower part salmon-buff to sordid cinna- 

 mon-buff in age. 



Spores 7-9 X 4-4.5 /a, ellipsoid, smooth, hyaline, hyaline to yellow- 

 ish in Melzer's reagent. Basidia 38-46 X 7-8 /x, 4-spored. Pleurocystidia 

 and cheilocystidia none seen. Gill trama of divergent hyphae, 2.5-6 /x 

 broad. Cuticle a gelatinous zone, 200-400 p thick, the hyphae 2-4 fx in 

 diameter and nearly hyaline, closely interwoven ( an ixocutis ) . No hy- 

 podermium differentiated. Pileus trama of radial hyphae. Clamp con- 

 nections present. 



Habit, Habitat, and Distbibution — Gregarious around an old oak 

 stump, Ann Arbor, Mich., September-October (and under conifers, 

 Smith 63312), Idaho; also Europe. Although Peck (1874) reported it 

 from New York, he later (1907) doubted his identification. 



Matebial Studied — idaho: Smith 54207. Michigan: Smith 20681, 

 51016. England: Reid, Sept. 18, 1952 (as H. eburneus var. cossus). 



Observations — By virtue of the odor and whitish pileus which 

 later develops an ochraceous tone, our collections are referred to H. 

 cossus. Kiihner and Romagnesi (1953) state that it is related to H. 

 flavodiscus, but we regard it as closer to H. laurae. Smith No. 63312 

 represents a large collection in all stages of development. 



153 



Hygrophorus chrysaspis Metrod 



Rev. Mycol. 3: 153. 1938 



Illustrations: 

 Fig. 75. 

 Metrod, Rev. Mycol. 3, pi. 2. 



Pileus 2-7(10) cm broad, convex, at times obtuse, glutinous or vis- 

 cid, matted-fibrillose beneath the gluten, white over all, becoming "pale 

 pinkish buff," drying "clay color" to "tawny," disc usually drying darker 

 to blackish or at times blackish stains or streaks scattered over the pi- 

 leus, margin incurved. Context watery yellowish white, unchanging or 

 finally yellowish when bruised; odor mild or not distinctive, at times 

 faintly fragrant, taste mild. 



