(Vol. 13 

 264 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



C. radiosum may be recognized by its occurrence on coniferous 

 wood, whitish or ivory-yellow color, white fimbriate margin, 

 subglobose spores about 6 (x in diameter, and presence of very 

 large vesicular bodies when sections are examined. These bodies 

 are often so inflated and with walls so tenuous that their location 

 is shown by vesicular spaces between the otherwise crowded 

 hyphae. 



No authentic specimen of C. radiosum determined by E. Fries 

 is known to be in existence, although there are four specimens so 

 determined by Karsten in Herb. Fries; two of these specimens are 

 Peniophora laetris, another is very immature but may be Stereum 

 odoratum, while the fourth specimen, Karsten, No. 32, has globose 

 spores 6-8 X 5-6 \i but does not show vesicular bodies in my 

 mount. However, these four specimens present the Karsten idea 

 of C. radiosum as to aspect. The colored illustration of C. radi- 

 osum in Fries' Icones, pi. 198, f. 1, is excellent, and taken in con- 

 nection wdth the good original description by Fries and his 

 critical comment on the close resemblance to his Peniophora laevis, 

 seems to me to afford a more secure foundation for the concept of 

 this species as C. radiosum than as Corticium alutaceum, for 

 Schrader's description of Thelephora alutacea consists of the fol- 

 lowing five words, viz., "Supra exalbida, subtus tomentosa 

 nivea." This vague description is not supplemented by an illus- 

 tration, and I have not been able to learn of the existence of an 

 authentic specimen. Any statement as to synonymy in the case 

 of resupinate Hymenomycetes by mycologists of a former century 

 is of slight value when a nice feature of internal structure is 

 decisive. 



Specimens examined: 

 Exsiccati: Ell. & Ev., Fungi Col., 1211, under the name Corticium 



Petersii. 

 Sweden: Femsjo, L. Romell, 177; Stockholm, L. Romell, 113, 178, 



181. 

 Austria: Innsbruck, Tirol, V. Litschauer; Stubai, Tirol, V. Lit- 



schauer, 2 specimens — all as C. alutaceum. 

 Hungary: Tatra Magna, V. Greschik, from Bresadola, under the 



name C. alutaceum. 

 Canada: Lower St. Lawrence Valley, J. Macoun, 87; Ontario, 



Ottawa, J. Macoun, 133, 20J^. 



