60 SECTION CAMAROPHYLLOPS1S 



10 



Hygrophorus angustifolius (Murr. ), comb. nov. 



Camarophyllus angustifolius Murr., North Amer. Flora 9: 386. 1916. 



Illustration : 

 Fig. 14. 



Pileus 2-5 cm broad, obtuse to plane, at times umbonate, the disc 

 becoming more or less depressed and margin uplifted ( very similar in 

 shape to H. pratensis), pure white, surface dry and unpolished, ap- 

 pearing innately fibrillose under a lens. Context thick and firm, white; 

 odor none, taste mild. 



Lamellae decurrent, pure white, close, narrow, thickish, very 

 brittle, some forked, edges even. 



Stipe 2-4 cm long, 10-20 mm thick, pure white, subequal, solid, 

 glabrous or with scattered fibrils. 



Spores (3.5)4.5-6 X 3-4.5 fx, drop-shaped to subglobose, smooth, 

 hyaline, not amyloid. Pleurocystidia and cheilocystidia none. Basidia 

 28-46 X 5-6 fx, 4-spored. Gill trama of narrow (2.5-4 /a), intricately 

 interwoven hyphae, yellowish in iodine. Pileus trama homogeneous, 

 yellowish in iodine. Cuticle a cutis, the surface hyphae not greatly 

 differentiated from the pileus tramal hyphae, 2-3 /x broad, colorless, 



Fig. 14. H. angustifolius (photograph by H. E. Bigelow) 



