1916] 
BURT—THELEPHORACEAE OF NORTH AMERICA VI 22d 
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. pannosus, 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: 
Exsiecati: Ravenel, Fungi Am., 57b, under the name Zygo- 
desmus pannosus; Thiimen, Мус, Univ., 2275, under the 
name Zygodesmus pannosus. 
Sweden: Upsala, Halmbyboda, from E. P. Fries (in Curtis 
Herb.) ; Stockholm, L. Romell, 219—222; Femsjö, L. Romell, 
223, and H Fries (in Herb. Fries under the manuscript 
name Hypochnus leprosus). 
Canada: Rockcliffe Park, J. Macoun, 144; St. Lawrence Val- 
ley, J. Macoun, 2. 
New Hampshire: Chocorua, W. G. Farlow, two collections. 
New Jersey: Newfield, J. B. Ellis, in Thümen, Mee, Univ., 
2275. 
Florida: Gainesville, H. W. Ravenel, in Ravenel, Fungi Am., 
91b. 
Wisconsin: New London, E. T. € S. A. Harper, 949; Stevens 
Point, C. J. Humphrey, 1948 (in Mo. Bot. Gard. Herb., 
4748). 
Jamaica: Cinchona, W. A. ё Edna L. Murrill, N. Y. Bot. 
Gard., Fungi of Jamaica, 630. 
13. H. pannosus (Berk. & Curtis) Burt, n. comb. 
Zygodesmus pannosus Berk. E 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, 
thick, with an occasional hypha running along the substratum 
