SUBSECTION CAMAROPHYLU 319 



more highly colored agaric, almost exactly like II. saxatilis in appear- 

 ance, but apparently the latter has more of a salmon tint to the gills 

 and definitely has a thin gelatinous pellicle. The two are very closely 

 related, however, and would merit a critical comparative study. Also, 

 it may very well be true that H. karstenii f. minor is a distinct species, 

 but as yet we do not know its range of variation; it could easily be 

 merely a stage in the development of color and size which has become 

 arrested when small and weakly colored. It is evident from the ac- 

 count of Favre and C. Poluzzi ( 1947) that a change in color occurs as 

 the carpophores enlarge and age. 



192 



Hygrophorus tenax, sp. nov. 



Pileus 2-4 cm latus, convexus, deinde planus vel depressus, albidus, 

 discus subluteus, interdum luteus hesus, primum viscidus, cito siccus, 

 glabrosus deinde fibriUosus vel squamulosus; odore ex gustu blandus; 



lamellae sub-decurrentes, pallidac demum "pinkish buff," subdistantes, 

 angustae; stipes 3-5 cm longus, 4—6 mm crassus, albidus, tarde subluteus 

 laesus, siccus, apice fibroso-punctatus, satis fibrosus, tenax. nullum 

 velum; sporaeS-8 X 3.5-4.5 jx, ellipsoideae. Specimen typicum in Herb. 

 Univ. Mich, conservatum; lectum prope Warren Dunes State Park, 

 Mich., Oct. 1, 1955, A. H. Smith 50625. 



Pileus 2-4 cm broad, convex, expanding to plane or slightly de- 

 pressed, dull white with a tendency toward yellow on the disc, at times 

 showing vellowish stains where injured, surface thinly viscid when 

 young but soon dry and merely with a slight resinous feel, glabrous but 

 soon more or less appressed-fibrillose to squamulose, margin ribbed in 

 age. Context thin but tough ( for this genus ) ; odor and taste not distinc- 

 tive. 



Lamellae slightly decurrent, near "pinkish buff" (not as white as 

 the pileus ) , unchanging when injured, subdistant, narrow, edges even. 



Stipe 3-5 cm long, 4r-6 mm thick, whitish, slowly discoloring to 

 yellowish on bruising, equal or narrowed downward, dry, apex fibrous- 

 punctate, rather fibrous-tough, veil none. 



Spores 6-8 X 3.5-4.5 fx, ellipsoid with a curved apiculus, smooth, 

 hyaline in KOH, yellowish-hyaline in Melzer's reagent. Basidia 30-40 X 

 6-7 ii, 4-spored, pale yellowish in Melzer's. Pleurocystidia and cheilo- 

 cystidia none. Gill trama divergent, hyphae 6-14 fx broad. Cuticle of 

 subgelatinous hyphae 3-5 \x broad, some with enlarged end-cells but 

 these not truly cystidioid, the hyphae more refractive in KOH than is 

 usual for the genus. Clamp connections present. 



