1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 225 



638. 1888; Bourdot & Galzin, Soc. Myc. Fr. Bui. 27: 232. 

 1911. Lyomyces polygonoides Karsten, Finska Vet.-Soc. Bidrag 

 Natur. och Folk 48: 419. 1889. Aleurodiscus roseus (Pers.) v. 

 Hohnel & Litschauer, K. Akad. Wiss. Wien Sitzungsber. 115: 

 1568. 1906. 



Fructification effused, rather thick, adnate, somewhat mem- 

 branaceous, small pieces separable when moist, drying pinkish 

 buff to buff-pink, pruinose, finally cracked, the margin whitish, 

 more or less byssoid; in section 200-280 \l thick, with the hy- 

 menial layer perhaps slightly colored, 2-layered, with the basal 

 layer composed of longitudinally arranged, densely interwoven 

 hyphae 3-33^ ^ in diameter, not incrusted, the hymenial layer 

 composed of erect hyphae, basidia, and slender, slightly brownish, 

 short-branched paraphyses; no gloeocystidia; basidia at first ex- 

 ceeded by the paraphyses, finally protruding; spores hyaline, 

 even, 6-12 x 4J^-8 \l. 



Fructifications sometimes 2-3 mm. in diameter and becoming 

 laterally confluent, more usually 1-10 cm. long, 1-3 cm. wide. 



On bark and wood of logs and branches of frondose species 

 such as Populus, Betula, Alnus, Acer, Carya, Ulmus, etc., rarely 

 on coniferous wood. In Europe, from Canada to Alabama, west- 

 ward to Manitoba and Washington, in New Mexico and Mexico, 

 and in Japan. Throughout the year. Common. 



C. roseum is well named, for its pale rose-color is distinctive and 

 is confirmed, when sections are examined, by the slender, slightly 

 brownish, short-branched organs which are probably paraphyses 

 but have seemed to me when in young vigorous condition to have 

 the branches tipped by very minute spherical bodies. C. poly- 

 gonoides is the early stage with the paraphyses exceeding the 

 young basidia. 



Specimens examined: 

 Exsiccati: Ell. & Ev., Fungi Col., 609, under the name Corticium 



incarnatum; de Thiimen, Myc. Univ., 2012. 

 Sweden: L. Romell, 47, 127, 146; Stockholm, L. Romell, 147. 

 Finland: Mustiala, P. A. Karsten, in de Thiimen, Myc. Univ., 



2012, and authentic specimen of Lyomyces polygonoides. 

 Austria: Stubai, Tirol, V. Litschauer. 

 Italy: Trient, G. Bresadola. 



