Nature of Tremella mycetophila 287 



comparisons with the lamellae of C. dryophila. I would transfer 

 the fungus to the genus Exobasidium, with the original description 

 of the species changed as follows : 



EXOBASID1UM MYCETOPHILUM (Peck) Burt 



Tremella mycetophila Peck, Rep. N. Y. Mus. 28 : 53. pL i.f. 4. 

 1879. 



Suborbicular, depressed, gyrose-plicate, fleshy, slightly prui- 

 nose, yellowish or pallid, .35—1 inch broad ; basidia simple, cylindric, 

 4-spored : basidiospores simple, hyaline, even, inequilateral or 

 slightly curved, 5-7 x 1. 5— 2.5/1; conidia simple, hyaline, even, 

 2 x 1.5 //, concatenate at the ends of slender subhymenial hyphae. 

 (Plate 23.) 



On stem and pileus of Collybia dryophila, August. 



New York : Oneida, Warne ; North Elbe, and Floodwood, 

 Peck ; East Gal way and Floodwood, Bart ; Syracuse, Underwood ; 

 New York, Cushier. 



New Hampshire : Shelburne, Far low. 



V 



Vermont : Ripton, Burt. 



MlDDLEBURY COLLEGE, MlDDLEBURY, Vt. 



. 



Explanation of Plate 



Fig. I. Three fructifications of Exobasidium mycetophilum on Collybia dryophila, 



natural size ( after Peck ) . 



Fig. 2. A large fructification of E, mycetophilum, nat. size ; and Fig. 3, a longi- 

 tudinal section through the same and the stem, s. of C. dryophila. 



Figs. 4 and 5. Basidia bearing basidiospores, X U4°- 



Fig. 6. Three basidiospores, X I 7°°- 



Fig. 7. Part of a section, showing groups of conidia, c t between the hyphae of the 

 deeper tissue of the fructification, X 5°°- Fi g- 8 - Portion of a hypha, showing 

 slender branches. 



Fig. 9. Conidia, a connected group of four at the left, X I 7 6 °- 



Fig. 10. A conidium borne at the end of a slender hypha, X IX 4°. 



Fig. II. A chain of four conidia at the end of a slender hypha which lies between 

 coarser hyphae, X 1 7 60. 



