Murrill: Agaricaceae of Pacific Coast 215 



2. Geopetalum porrigens (Pers.) 



Agaricus porrigens Pers. Obs. Myc. i : 54. 1796. 

 Seattle, Washington, Murrill ^ip, Zeller 5(5. 



3. Geopetalum oregonense sp. nov. 



Pilens thin, sessile, conchate to flabelliform, convex to ex- 

 panded, milk-white throughout, gregarious on dead wood, reach- 

 ing I cm. ; surface smooth, glabrous, margin entire, incurved 

 when young and on drying; lamellae subdistant, inserted, rather 

 narrow, white, slightly yellowish when dry; spores pip-shaped, 

 smooth, hyaline, 6-7 X 3-4 fJ^ ', stipe wanting, the pileus attached to 

 a small, subglobose, white, tomentose mass. 



Type collected on fallen dead deciduous branches at Mill City, 

 Oregon, November 9, 1911, W. A. Murrill 821. Also collected 

 at Corvallis, Oregon, November 6-11, 1911, on dead deciduous 

 branches, W. A. Murrill pi6, gp8. Related to Pleurotus candidis- 

 simus (Berk. & Curt.) Sacc. 



4. Geopetalum subsepticum sp. nov. 



Pileus fleshy, thin, flexible, white throughout, dimidiate and 

 conchate to subcircular or reniform, attached to dead grasses, 

 twigs, trunks, and leaves, solitary, scarcely reaching i cm. in 

 breadth; surface smooth, glabrous, margin lobed, inflexed on 

 drying; lamellae subdistant, plane, inserted, white, yellowish- 

 brown on drying ; spores narrowly oblong, smooth, hyaline, 7-9 X 

 2-3 ^. 



Type collected on dead leaves, etc., in woods near Seattle, Wash- 

 ington, October 20-November i, 1911, W. A. Murrill 413. Also 

 collected near Seattle, Washington, October 20-November i, 

 1911, W. A. Murrill 265, 533. Related to Pleurotus septicus, but 

 spore characters very dif¥erent. 



5. Geopetalum densifolium sp. nov. 



Pileus fleshy, sessile, conchate to applanate, flabelliform, rather 

 broadly attached, white throughout, gregarious, reaching 2 cm. 

 broad ; surface finely pubescent to subglabrous, smooth, margin 

 entire, slightly inflexed on drying; lamellae very broad and very 

 crowded, flaccid, overlapping on drying, white to isabelline, pow- 

 dered with the spores, inserted, plane ; spores ellipsoid, smooth, 

 hyaline, 6-7 X 3-5 A^- 



