[Vol.13 

 178 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fung. 1 : 204. 1828. Corticium croceum Bresadola, I. R. Accad. 

 Agiati Atti III. 3: 112. 1897; Bourdot & Galzin, Soc. Myc. Fr. 

 Bui. 27: 242. 1911; Rea, Brit. Basid. 676. 1922. An Sporo- 

 trichum croceum Kunze & Schmidt, Myk. Heft. 1: 81. 1817? 

 Not Corticium sulphureum Persoon, which is a synonym of 

 Hypochnus fumosus Fries. See Burt, Mo. Bot. Gard. Ann. 3 : 

 239. 1916. 



Type: authentic specimen in Kew Herb. 



Fructifications effused, fibrillose-byssoid, sulphur-yellow to 

 wax-yellow when a sterile mycelium, becoming whitish through- 

 out when forming the hymenium, the margin yellow or whitish, 

 running out into sulphur-yellow to wax-yellow branching rhizo- 

 morphic strands; when fertile 200-300 \l thick in section, not 

 appreciably colored, the hyphae loosely arranged, ascending, 

 branching, 2J^ \i in diameter, rough-walled or somewhat in- 

 crusted with small crystals; no gloeocystidia ; spores hyaline, 

 even, 3x2(i, copious. 



Fructifications 3-10 cm. long, 2-4 cm. wide. 



Under side of decaying Fagus and other species. Europe, 

 Maryland, Missouri, Montana, and Idaho. Common in Europe 

 but rare in North America. August to October. 



The mycelium of C. sulphureum is conspicuous by its brilliant 

 wax-yellow color, but in fruiting this yellow color is lost through- 

 out the fructification, persisting only about the margin and in 

 the rhizomorphic strands. By this curious character and by the 

 pruinose or velvety hymenium one may distinguish C. sulphureum 

 from C. bicolor. The International Botanical Rules afford no 

 ground for the displacement by Bresadola of the well-established 

 name Corticium sulphureum by C. croceum. 



Specimens examined: 

 Sweden: authentic specimen from E. Fries (in Kew Herb.); 



Femsjo, E. A. Burt, 2 gatherings; Stockholm, L. Romell, 151, 



152. 

 Germany: Brinkmann, comm. by G. Bresadola. 

 Austria : Innsbruck, V. Litschauer; Tirol, V. Litschauer. 

 Maryland: Takoma Park, C. L. Shear, 1069. 

 Missouri: Meramec Highlands, F. P. McWhorter (in Mo. Bot. 



Gard. Herb., 57359). 



