[Vol. 13 

 206 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



21. C. canum Burt, n. sp. 

 Type: in Burt Herb. 



Fructifications effused, thin, hypochnoid, tender, not separ- 

 able, whitish to pale pinkish buff in the herbarium, even, with 

 the hymenium fibrillose under a lens rather than in the form of a 

 continuous pellicle, the margin thinning out, arachnoid ; in section 

 100-180 (X thick, not colored, composed of lax, loosely interwoven 

 hyphae 23/^ [a in diameter, thin-walled, nodose-septate, not in- 

 crusted, bearing a more compact hymenium; no gloeocystidia: 

 spores hyaline, even, 3-4 x 1^-2 \i. 



Fructifications 3-5 cm. long, ^-13^ cm. wide. 



On decaying wood and bark of conifers. Canada to Louisiana 

 and in Washington. September to October. Infrequent. 



C. canum belongs in the group with C. centrifugum and C. pel- 

 liculare but differs from both in more hypochnoid structure and 

 smaller spores. The hyphae are nodose-septate and not in- 

 crusted. 



Specimens examined : 

 Canada: J. Macoun, 13, type, and 86, in part. 

 New York: Ithaca, G. F. Atkinson, 2563. 

 Maryland: Takoma Park, C. L. Shear, 1063. 

 Louisiana: St. Martin ville, A. B. Langlois, 168, comm. by Lloyd 



Herb., 3046. 

 Idaho: Coolin, J. R. Weir, 11101 (in Mo. Bot. Gard. Herb., 



63391); Priest River, J. R. Weir, 21. 

 British Columbia: Salmo, Kootenai Mts., /. R. Weir, J^J^l (in 



Mo. Bot. Gard. Herb., 21800). 

 Washington: Hoquiam, C. J . Humphrey, 6375, 6413. 



22. C. centrifugum (L^v.) Bresadola, Ann. Myc. 1:96. 1903; 

 V. Hohnel, Ann. Myc. 3: 188. 1905; Bourdot & Galzin, Soc. 

 Myc. Fr. Bui. 27:240. 1911. 



Rhizoctonia centrifuga L^veill^, Ann. Sci. Nat. Bot. 11. 20: 225. 

 1843. — Hypochnus centrifugus Tulasne, Fung. Carp. 1: 113. 

 1861; Sacc. Syll. Fung. 6: 654. 1888. — Corticium dedpiens v. 

 Hohnel & Litschauer, K. Akad. Wiss. Wien Sitzungsber. 117: 

 1116. 1908. 



Fructifications effused, very thin, arachnoid, forming a con- 



