[Vol. 13 

 224 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



thinning out, somewhat arachnoid; in section 100-200 y. thick, 

 not colored, composed of interwoven, hyaline hyphae 5-8 (jl in 

 diameter, not incrusted, no clamp connections found; no gloeo- 

 cystidia; spores hyaline, even, 6-12 X 4-8 \l. 



Fructifications 5 mm.-2 cm. long, 5-10 mm. wide. 



On living mosses and on bark of dead Alnus and Betula. In 

 Europe and in New York, Michigan, and North Dakota. 



This species may be recognized by bright rose color when fresh, 

 occurrence on living moss and dead alders, large spores, coarse 

 hyphae, and absence of gloeocystidia. The three American speci- 

 mens cited below seem referable to C. laetum except that their 

 hyphae are more numerous and of smaller diameter 4-6 \l than 

 those of the European specimens with which compared. Penio- 

 phora aurantiaca has much the same aspect and occurs on Alnus 

 also but has gloeocystidia and cystidia. 



Specimens examined: 

 Sweden: L. Romell, H5. 

 Finland: Mustiala, authentic specimen of C. hypnophilum from 



Karsten. 

 Italy: specimen on Alnus of C. laetum collected and determined 



by Bresadola. 

 New York: Karner, H. D. House (in N. Y. State Mus. Herb., and 



Mo. Bot. Gard. Herb., 44708). 

 Michigan: Isle Royale, Allen & Stuntz, J$, comm. by Univ. Wis. 



Herb. 

 North Dakota: Brenckle, comm. by V. Litschauer, 2. 



36. C. roseum Persoon, Roemer Neues Mag. Bot. 1: 111. 

 1794; Fries, Epicr. 560. 1838; Hym. Eur. 650. 1874; Berkeley, 

 Outl. Brit. Fung. 273. 1860; Sacc. Syll. Fung. 6: 611. 1888; 

 Bourdot & Galzin, Soc. Myc. Fr. Bui. 27: 233. 1911; Coker, 

 Elisha Mitchell Scientif . Soc. Jour. 36 : 171. pi 83, f. 3-5. 1921 ; 

 Rea, Brit. Basid. 673. 1922. 



Thelephora rosea Persoon, Syn. Fung. 575. 1801; Myc. Eur. 

 1 : 131. 1822; Fries, Syst. Myc. 1 : 451. 1821 ; Elench. Fung. 1 : 

 203. 1828. Corticium roseolum Massee, Linn. Soc. Bot. Jour. 

 27: 140. pi. 6, f. 2. 1890. C. polygonoides Karsten, Soc. pro 

 Fauna et Fl. Fenn. Meddel. 6: 12. 1881; Sacc. Syll. Fung. 6: 



