172 Journal of the Mitchell Society [February 



Basidia 4-spored, long club-shaped, about 1 .b\j. thick and project- 

 ing about 40-50(x; sterile cells of much the same appearance are 

 scattered among them and may be young basidia. Spores (of No. 

 4703) clear salmon, smooth, elHptic, 5.5-7.5 x 9.3-13ix, granular, 

 sprouting over night in a damp chamber. 



Our plants agree perfectly with a collection of C. roseum from 

 Bresadola at the New York Botanical Garden and with collections 

 so named at Washington. Dr. Burt has seen our No. 3981 and de- 

 termined it as C. roseum. 



3981. On decaying hickory tree, Januarj^ 18, 1920. Hyphae delicate, clamp- 

 connected, 3-4m thick. Spores smooth, subelliptic, 4.5-6 X 10-15m. 

 4703. On bark and wood of branches of Salix sericea, Glen Burnie Farm, Decem- 

 ber 5, 1920. 



5. Corticium Viticola (Schw.) Fr. 



Plate 33 



Plants appearing as small, irregular patches with deep orange- 

 red centers and paler byssoid margins which extend and fuse to form 

 elongated crusts up to 2 or more cm. long and 1 cm. wide. Hymen- 

 ium forming irregularly and at times in scattered patches, again 

 continuous, pale sulphur yellow, with the appearance of fine leather, 

 about 45-50[jL thick; the substance below about 185-250[x thick and 

 composed of very loosely woven, rather even threads about 3-4^1. 

 thick, without clamp connections, which are usually a deeper, more 

 orange color. 



Spores white, smooth, elliptic, with one side flatfish, 5-5.5 X 

 8.5-9.4tx 



Among the layers of the bark run deep orange rhizomorphic 

 strands with byssoid fringes which connect with the superficial part. 

 4693. On dead bark of a live grapevine, New Hope Swamp, December 4, 1920. 

 Middle and upper districts on bark of grapevines. Curtis. 



6. Corticium arachnoideum Berk. 



Plates 17 and 33 



Effused irregularly over area of several centimeters, closely ad- 

 herent, color pure white; margin indistinct and pulverulent or hypoch- 

 noid, in center thicker and smooth, and in most places minutely 

 powdery, having the appearance of a thin white-wash. In section 

 about 111^ thick; context made up of very loosely packed, clamp- 



