SUBSECTION HYGROPHORUS 293 



176 



Hygrophorus olivaceoalbus var. intermedins, var. nov. 



Pileus 3-10 cm lotus, convexus demum planus, modicc umbonatus, 

 glutinosus, cinereis fibrillis striatus; caro crassa, alba, odore et gustu 

 mitis; lamellae decurrentes, albae deinde pallidae ("tilleul buff"), dis- 

 tantes demum subdistantes, latae; stipes 3-9 cm longus, 10-25 mm 

 crassus, aequalis vel anguste clavatus, viscidus, cincreo-fibrillosus; 

 sporae 9-12 X 5.5-7 /x, ellipsoid cae demum oblongae. Specimen typi- 

 cum in Herb. Univ. Mich.; lectum Trout Lake, San Juan Mts., Colo., 

 Aug. 17, 1956, A. H. Smith 52370. 



Pileus 3-10 cm broad, convex to plane with an inrolled margin, ex- 

 panding to slightly umbonate to plane, margin finally uplifted in some, 

 surface glutinous when fresh and streaked beneath the gluten with 

 gray fibrils ( paler than "light drab" ) , in age either streaked or if dried 

 out often slightly squamulose; flesh thick, white, odor none, taste mild. 

 Lamellae decurrent, white becoming pallid ("tilleul buff"), thick, 

 forked and anastomosing, distant to subdistant, broad, edges even. 



Stipe 3-9 cm long, 10-25 mm thick, equal, ventricose or narrowly 

 clavate downwards lower two-thirds viscid and with a layer of gray 

 fibrils like those on cap terminating in a superior annular zone, white 

 and silky above the zone. 



Spores 9-12 x 5.5-7 /x, ellipsoid to oblong, hyaline in KOH, and yel- 

 lowish-hyaline in Melzer's reagent, smooth; when revived often with 

 refractive material variously distributed just beneath the thin wall. 

 Basidia 4-spored, 50-60 X 8-9 fx, with a long flexuous pedicel. Pleuro- 

 cvstidia and cheilocystidia none. Gill trama divergent. Pileus with a 

 gelatinous cuticle of appressed hyphae 4-6 p broad, their content yel- 

 lowish gray in KOH, beneath this the flesh hyaline and floccose. 

 Clamp connections present. 



Habit, Habitat, and Distribution — Caespitose-scattered under 

 Picea engelmanii, Trout Lake, San Juan Mts., Colorado, August. 



Material Studied — Colorado: Smith 52370 (type, from Trout 

 Lake, San Juan Mts., Aug. 17, 1956). 



Observations — This is essentially a large Hygrophorus of the stat- 

 ure of H. fuligineus but differs in larger spores and a very thin layer 

 of pale-gray fibrils beneath the viscid coating of the stipe. In the dried 

 specimens the lower part of the stipe is pale gray (usually paler than 

 the cap) because of this layer. Because of the colored inner veil and 

 the large spores, it would seem to be H. olivaceoalbus. However, a spe- 

 cies answering well to the description of H. olivaceoalbus is well 



