1916] 



BURT THELEPHORACEAE OP NORTH AMERICA VI 223 



On rotten wood and bark of both coniferous and frondose 

 species. Canada to Florida, in Wisconsin and in Jamaica. 

 May to January. Probably common. 



H, isabellinus is a little thinner and a little paler than 

 H, pannosKrS, and not separable from the substratum in the 

 collections which I have studied. It is best distinguished 

 from the latter species by the larger hyphae of H. isabellinus 

 and lack of clamp connections. 



Specimens examined: 

 Exsiccati: Eavenel, Fungi Am., 57b, under the name Zygo- 



desmus pannosus; Thumen, Myc. Univ., 2275, under the 



name Zygodesmus pannosus. 

 Sweden: Upsala, Halmbyboda, from E. P. Fries (in Curtis 



Herb.) ; Stockholm, L. Romell, 219-222; Femsjo, L. Romell, 



223, and E. Fries (in Herb. Fries under the manuscript 



name Hypochnus leprosu^). 

 Canada : Rockcliffe Park, J. Macoun, 144; St. Lawrence Val- 

 ley, J. Macoun, 2. 

 New Hampshire: Chocorua, W. G. Farloiv, two collections. 

 New Jersey: Newfield, J. B. Ellis, in Thumen, Myc. Univ., 



2275. 

 Florida : Gainesville, H, W. Ravenel, in Eavenel, Fungi Am., 



57b. 

 Wisconsin: New London, E. T. S S. A. Harper, 949; Stevens 



Point, C. J. Humphrey, 1948 (in Mo. Bot. Gard. Herb., 



4748). 

 Jamaica: Cinchona, W. A. S Edna L. Murrill, N. Y. Bot. 



Gard., Fungi of Jamaica, 630. 



13. H. pannosus (Berk. & Curtis) Burt, n. comb. 



Zygodesmus pamnosus Berk. & Curtis, Grevillea 3:112. 

 1875. 



Type: cotype in Curtis Herb. 



Fructification effused, byssoid-membranaceous, separable 

 when well developed, tomentose, varying in brown from Sac- 

 cardo's umber and snuff-brown to cinnamon-brown, the mar- 

 gin concolorous and thinning out; in structure 120-350/4. 

 thick, with an occasional hypha running along the substratum 



