160 Journal of the Mitchell Society [February 



2. Peniophora albomarginata (Schw.) Massee. 



Stereum alhohacUum (Schw.) Fr. 



Plates 18 and 31 



Entirely resupinate or, when on the sides of branches, with a 

 free shelving margin which is rarely over 7 mm. wide, beginning as 

 subcircular or oblong patches which may later fuse into an extensive 

 membrane, color of hymenium when damp a rich deep brown (about 

 bister brown of Ridgway) with a conspicuous white margin which is 

 sharply delimited and not byssoid; when dry the brown lightens to 

 about avellaneous with a darker ring just behind the white margin; 

 shelving part brown on back, inherently fibrous and roughish, not 

 tomentose, obscurely zoned. The resupinate part can be removed 

 from the wood without much difficulty as a pliable thickish membrane 

 like chamois skin, which in cross section is concolorous, fibrous and 

 about 0.6-0.8 mm. thick. The hymenium is not shining but has a 

 velvety, glaucous appearance. When drying the plant does not 

 crack, but remains a complete membrane. 



Spores (of No. 3849) smooth, white, elliptic, some bent, 3-4 x 

 6.5-9.3[i-. Basidia clavate, 7.2^ thick; sterigmata four. Cystidia 

 pointed, encrusted with crystals. 



This is treated as Stereum alhobadium by Burt. We are not 

 using the name alhobadium because we do not want to make a new 

 combination. 



3849. Dead limbs of peach or cherry in a brush heap, December 9, 1919. 

 3873. On fallen branch of ironwood (Carpinus) in Arboretum, December 12, 1919. 

 3932. On dead sycamore limb, January 10, 1920. 



Hartsville, S. C. Several collections, December, 1919. Coker. 

 Low and middle districts on trunks and branches. Curtis. 



3. Peniophora violaceo-livida (Somm.) Bres. in Bourdot and Galzin, 



Bull. Soc. Myc. Fr. 28: 405. 1912. 



Corticium violaceo-lividum (Somm.) Fr. 



Plate 31 



Entirely resupinate and crustaceous or rarely the margin curled 

 up for 1-2 mm., thin and pliable and leathery when growing, the 

 margin appressed and rather definite but extending with short fibers; 

 the very margin whitish purple, then a handsome brownish purple, 

 the older surface losing most of the purple and becoming dry and 



