Fungus Flora of ML Hood 133 



This species has two characters which might lead one to 

 place it in the genus Psathyra, viz. the cartilaginous stem and 

 straight margin of the young pileus. The innate character of 

 the pileus covering which represents a universal veil is, however, 

 a Hypholoma character. The universal veil in the indusiate 

 Psathyras is detersile and usually only scattered loose flecks of it 

 are found on the young pileus. This species is to be placed in 

 the section of Hypholoma to which H. velutinu7n and H. me- 

 lanthinum belong, in spite of the fact that the spore characters 

 are different from those species. It forms a connecting link 

 between Hypholoma and Psathyra. 



Hypholoma tsugaecola, sp. nov. (See Plate VIII.) — Pileus 

 3-7 cm. broad, thin and pliant, convex then subexpanded-discoid, 

 finally depressed on disk and margin elevated, subviscid, with 

 a separable subgelatinous pellicle, hygrophanous, "buckthorn 

 brown" to ''ochraceous-tawny" (R.) when moist, "j^ellow ochre" 

 to "antimony-yellow" when dry, glabrous, but margin narrowly 

 appendiculate from the veil, margin at first incurved, very thin 

 and acute, pellucid-long-striatulate ; flesh about 1 mm. thick, 

 thicker on disk, concolor, fading. Gills adnate-subdecurrent, 

 close, narrow, almost hnear, 5-7 mm., soon " ochraceous-tawny " 

 (R.) with a darker sheen by reflected light, edge entire. Stem 

 curved-ascending, 5-8 cm. long, subequal, 5-8(10) mm. thick, 

 apex conspicuously dilated in the region of gill-attachment, 

 "snuff-hrown" (R.) within and without, surface at first with 

 scattered, scurf-like detersile scales up to the obsolete annu- 

 lus, then longitudinally fibrillose, rigid, fibrous with subcarti- 

 laginous cortex, solid below, firmly stuffed, finally hollow at 

 the apex. Odor none; taste bitterish. Spores 6-7.5 x 4-4.5 

 (5) jJL, short ellipsoid, smooth, purplish-brown under the micro- 

 scope, dark purplish in mass; cystidia none; sterile cells in- 

 distinct; basidia 4-spored, 32 x 4-5 fx. 



Cespitose on dead hemlock stub. Mt. Hood, Oregon. Octo- 

 ber 9. Coflected by C. H. Kauffman. 



There are relatively few viscid or pelliculose species of Hy- 

 pholoma; two rare British species have been described. H. 

 incomptum Massee is similar to ours, but differs in the much 



