1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 2G9 



Bourdot & Galzin, Soc. Myc. Fr. Bui. 28: 363. 1913. G. poly- 

 gonium (Pers.) var. fulvescens Bresadola, Mycologia 17: 69. 1925. 



Fructifications orbicular, soon confluent and broadly effused, 

 closely adnate, thin, pale ecru-drab to brownish drab, pruinose, 

 even or somewhat tubercular, waxy, the margin whitish; in 

 section 150-250 y. thick, not colored, composed of suberect, inter- 

 woven hyphae 3-5 [l in diameter, occasionally nodose-septate, and 

 of pyriform gloeocystidia 10-25 X 5-20 y.; spores hyaline, even, 

 cylindric, slightly curved, 7^-10 X 23^-3 \l. 



Fructifications 3-5 mm. in diameter, becoming by confluence 

 up to 8 cm. long, 1-2 cm. wide. 



On fallen branches of Populus. In Europe and in Colorado, 

 Idaho, Manitoba, and Washington. 



American specimens of C. polygonium are not as heavily prui- 

 nose as the European specimens which I have seen and may be 

 recognized by the light grayish vinaceous color of the fructifica- 

 tions, occurrence on poplar bark, large, scattered gloeocystidia, 

 and slender, cylindric spores. 



Specimens examined: 

 Exsiccati: Cooke, Fungi Brit., 6; Romell, Fungi Scand., 128. 

 Sweden: Stockholm, L. Romell, 118, 119, and in Romell, Fungi 



Scand., 128, and W. A. Murrill, comm. by N. Y. Bot. Gard. 



Herb, (in Mo. Bot. Gard. Herb., 61477); Svex, Soderm., 



Lindblad, from E. Fries (in Kew Herb.). 

 Germany: Brinkmann, comm. by Bresadola. 

 Austria: Tirol, V. Litschauer. 



England: Batheaston, C, E. B., in Cooke, Fungi Brit., 6. 

 Colorado: Geneva Creek Canyon, F. J. Seaver & E. Bethel (in 



N. Y. Bot. Gard. Herb., and Mo. Bot. Gard. Herb., 61474); 



Lake Eldora, F. J. Seaver & E. Bethel (in N. Y. Bot. Gard. 



Herb., and Mo. Bot. Gard. Herb., 56793). 

 Idaho: J. R. Weir, 16824, type of Gloeocystidium polygonium var. 



fulvescens (in Weir Herb.); Coolin, J. R. Weir, 11551 (in Mo. 



Bot. Gard. Herb., 63703); Priest River, /. R. Weir, l/fitf (in 



Mo. Bot. Gard. Herb., 56803). 

 Manitoba: /. L. Conners & J. F. Higham, comm. by G. R. Bisby, 



394 (in Mo. Bot. Gard. Herb., 58969). 

 Washington: Bingen, W. N. Suksdorf, 719, 902. 



