92 SECTION CAMAROPHYLLOPSIS 



bipes. The spores are typically smaller, also, but the various measure- 

 ments for H. pratensis indicate enough variation in size to invalidate 

 the character as a difference between these two species. 



35 



Hygrophorus umbrinus Dennis 

 Kew Bull. 2: 257. 1953 



Illustration : 



Dennis, Kew Bull. 2, fig. 2. 



Pileus 5 cm broad, expanded, umbonate to depressed, grayish 

 brown to avellaneous, dry, innately-fibrillose. Context white, firm. 



Lamellae decurrent, white then pallid brown ( "bubalinae" ) , 

 broad, margins obtuse. 



Stipe white then avellaneous, fibrillose, base attentuated, solid. 



Spores 4.5-5.5 /x in diameter, globose, smooth, pale yellow in Mel- 

 zer's reagent. Basidia 46-62 X 5-7 /x, 2- and 4-spored. Pleurocystidia 

 and cheilocystidia none. Gill trama: (1) a mediostrate of somewhat 

 parallel hyphae, 3-4 /x broad; (2) elsewhere the hyphae are more or 

 less interwoven 4-6 /x broad. Cuticle undifferentiated, surface hyphae 

 non-gelatinous, fuscous to brown, repent or erect, with clamp connec- 

 tions. Pileus trama distinctly radial. 



Habit, Habitat, and Distbibution— On soil, under bamboo, Trini- 

 dad. 



Matebial Studied — tbinidad: Dennis 177 (type, from St. Joseph). 



Obsebvations — We have studied the type and have recorded our 

 observations in the account of microscopic characters above. Our ob- 

 servations agree with those of Dennis. Singer (1955) has also studied 

 the type at Kew. He found the basidia 42- X 6-7.3 /x (the 4-spored 

 ones), and 4.3 /x broad (the 2-spored ones); the gill trama is inter- 

 woven. 



36 



Hygrophorus obconicus Pk. 



N. Y. State Mus. Bull. 131: 36. 1909 



Camarophyllus obconicus (Pk.) Murr., North Amer. Flora 9: 386. 

 1916. 



Pileus 1-2.5 cm broad, convex, moist or hygrophanous, soon dry, 

 "light buff" to "avellaneous," fading to whitish, pruinose to innately 

 fibrillose or canescent, margin even, often lobed. Context thick on the 

 disc, thin on the margin, white, waxy, fragile; odor none, taste slightly 

 sour or none. 



