190 



Mycologia 



This plant is mentioned here because to my knowledge it has not been 

 previously reported from Oregon and because of its enormous size. The 

 pileus of the plant collected measures 26 cm. broad and the stipe 24 cm. 

 long with a diameter of 3.5 cm. above and 5.5 cm. below. 



151. Stropharia aeruginosa Fries. 



Under oaks on hills near Corvallis, November. Rather frequent. No. 

 2133. 



152. Stropharia ambigua (Pk.) Zeller. 



This is one of the most conspicuous of the Agarics to be found in co- 

 niferous and mixed woods of western Oregon during October and Novem- 

 ber. Nos. 1875, 2127. 



153. Stropharia rugomarginata Zeller & Epling, sp. nov. 



Pileus 6-12 cm. broad, fleshy, convex or broadly conic, becoming ex- 

 panded to plane, glabrous, disk even; margin reticulate-rugose (pitted), 

 pinkish-buff or cinnamon on the disk, drying cinnamon-buff to tawny- 

 olive ; flesh thin, whitish ; lamellae crowded, thin, watery, broadly-adnate 

 or slightly decurrent, edge undulate, minutely-serrate, concolorous be- 

 coming cinnamon, then tawny-olive in age, drying cinnamon-brown ; spores 

 ovoid-ellipsoid, appearing truncate at the apex because of a distinct germ- 

 pore through the heavy exospore, usually obliquely-apiculate at the broad- 

 er end, 8—9.5 x 4-5 cinnamon-brown in mass when moist, mummy- 

 brown when wet and Saccardo's umber when dry ; basidia clavate-cyl- 

 indric, 8.5x30-35,11; stipe fleshy, solid or stuffed, glabrous, concolorous 

 or whitish and shining above, subequal, tapering slightly either way, 6-12 

 cm. long, 12-15 mm. in diameter; annulus ample, persistent but sometimes 

 disappearing at maturity, whitish. Odor and taste mild and not distinctive. 



In lawns under conifers. Solitary or subgregarious. December. 



Stropharia rugomarginata is distinguished by the characters of the 

 pileus and spores. The reticulate ridges on the pileus cause a pitting of 

 a band of the surface near the margin about 1-2 cm. broad. The disk 

 is even. In the younger plants the reticulate-rugose character disappears 

 with drying but in the older plants it is retained as a faint, smooth, reticu- 

 lation. The spores are distinctive in shape and color. The egg-shaped 

 spore has a distinct germ-pore at the apex causing a truncate appearance 

 and is usually attached obliquely at the broad end. When the spores were 

 placed in enzyme solutions they threw out the germ tubes through the 

 germ pores. When first shed in mass they appear more or less ochraceous 

 but as they dry they become purplish-brown. 



Specimens examined: Oregon, Corvallis, S. M. Zeller 2180, type (in 

 Zeller Herb.) and C. C. Epling 314 (in Epling Herb.). 



154. Hypholoma fasiculare Fries. 



On dead wood, both coniferous and deciduous, Corvallis. October 

 until frost. Nos. 1869, 2185. 



This is undoubtedly the most common Hypholoma in the northwest. 

 It is usually reported as saprophytic on coniferous wood but it is often 

 found on deciduous trees and shrubs. It grows from the dead portions 

 of the crowns of cane fruits (Rubus) but it has not been determined 

 whether this infection was originally parasitic or merely following death 

 of portions of the host due to other causes. In the Medford district, 

 Jackson County, fruiting bodies were found at the base of apple trees 



