142 C. H. Kauffman 



sublacerate, stuffed to hollow, tinged vinaceous or subrufescent 

 within, soon soft and putrescent at base. Annulus at first 

 erect-flaring and white, then deflexed, thick, interwoven-silky, 

 smooth above, densely floccose-scaly and vinescent beneath, with 

 a broad floccose rim when normal, double, persistent, superior. 

 Odor none, taste tardily bitterish-subnauseous. Spores oval- 

 oblong, 5-6(6.5) X 3(3.5) ji, obtuse, smooth, purplish-brown; cys- 

 tidia none; basidia 4-spored, 30-34 x 5-6 ii. 



In low moist conifer forests or near alders, usuall}^ in humus. 

 More frequently solitary or few. Not uncommon. Mt. Hood, 

 Oregon. October 11. Collected by C. H. Kauffman. 



This was the only forest Psalliota seen, and although not 

 abundant it occurred singly with some frequency. It is super- 

 ficially similar to P. rutilescens Pk.-Kauff. (13), but funda- 

 mentally is quite distinct. It differs from that species by its 

 double annulus, stuffed to hollow, non-bulbous stem, the nar- 

 rower spores and the highly developed blematogen. The dif- 

 ferentiation of the concrete surface layer of the pileus and of the 

 sheath and annulus take the same course during development as 

 in the case of P. rodmani Pk. studied by Atkinson (1). The 

 sheath on the young stem, along with the portion up to the 

 margin of the pileus, includes the partial veil as an interior 

 layer — thin along the stem  — and this composite sheath can be 

 easily peeled off from the stem at this stage. 



PSATHYRA PENNATA Fr.-RickeU 



PsATHYRA PERSiMPLEx Britz.-Kauff . (12, p. 270) 



Psathyra fragilissima, sp. nov. (See Plate XI.) — Pileus 2-5 

 cm. broad, 1.5-3 cm. high, very fragile, at first broadly conic 

 and obtuse, conic-campanulate at maturity, hygrophanous, 

 "light cinnamon drab" (R.) and even when young and moist, 

 later "benzo brown," at first covered by snow-white evanescent 

 floccose-fibrillose, small and superficial scales, "pale pinkish buff" 

 and even when dry, soon glabrous, margin at times evanescently 

 appendiculate; flesh thin, equal, fragile, concolor. Gills ascend- 

 ing, adnate-seceding, relatively narrow, 3-5 mm., crowded, soon 

 "hair-brown" then "fuscous" (R.), edge at first minutely white- 

 flocculose. Stem long and slender, extremely fragile, 10-15(18) 



