SUBSECTION* HYGROCYBE 121 



55 



Hygrophorus immutabilis Pk. 



N. Y. State Mus. Ann. Rept. 51: -2^2. 1S ( )S 



Hydrocybe immutabilis (Pk.) Murr., North Amer. Flora 9: 382. L916. 



Pileus 15-25 nun broad, conical or convex and umbonate, greenish 

 brown or yellowish brown, not changing color on drying, margin often 

 striate when dry. 



Lamellae whitish or yellowish, subdistant, broad or medium broad. 



Stipe 2.5-5 cm long, 3-4 mm thick, yellow, glabrous, hollow . 



Spores 8-11 X .5-7 ^, ellipsoid, smooth, pale yellow in Melzer's rea- 

 gent. Basidia 30-46 x 8-10 /x, 4-spored. Pleurocystidia and cheilocys- 

 tidia none. Gill trama parallel, hvphae 3.5-8 f i broad. Cuticle of repent 

 to more or less erect, non-gelatinous hyphae, 2-4 /x broad, brownish. 

 No hypodermium. Clamp connections present but rare on the cutienlai 

 hvphae. 



Habit, Habitat, and Distribution — On dry sandy or heathy soil. 

 New York, August. 



Material Studied — new yobk: Peck (type, from North Elba, 

 August 1897). 



Observations — The microscopic characters given above are based 

 on our study of the type. 



Peck (1898) comments on this species as follows: "This plant is 

 manifestly closely allied to Hygrophorus conicus, and might easilv be 

 considered a mere variety of it. It differs, however, in being less regu- 

 larly and acutely conical, in having no orange, scarlet or red hues, in 

 its paler or whitish lamellae, and specially in its unchangeable color. 

 Specimens of H. conicus collected at the same time and place and sub- 

 jected to the same method of drying turned black, as usual, but these 

 retained their colors." 



56 



Hygrophorus spadiceus ( Fr. ) Fr. var. spadiceus f . spadiceus 



Hymen. Eur., p. 420. 1874 



Hygrocybe spadicea (Fr.) Karst. 1879. 



Illustrations: 

 Fig. 31. 



Cooke. Illus. Brit. Fungi, pi. 1194 (1161). 

 Bresadola, Icon. Myc, tab. 351. 



Pileus 3-4 cm broad, conic, with a straight margin, expanding to 

 broadly conic, "olive brown" at first but a lemon yellow reflection fi- 

 nally pervading in the marginal area causing it to appear near "citrine 



