468 RESEARCHES ON FUNGI 



surrounding chips and earth in which the Colly bia was growing. 

 One mass was four inches in diameter. The Collybia was growing 

 abundantly among the decaying debris of a large water-soaked log 

 and was covered over with the white convoluted masses of the Exo- 

 basidium." Miss Hone ^ remarks that her Minnesota specimens 

 differ from those described by Burt in (1) the much larger size of 



Fig. 193. — Collybia dryophila, with stipes and pilei bearing Tremella-like outgrowths 

 formerly beUeved to be due to a parasite, Tremella mycetophila. Collected in 

 Crow Wing County, Minnesota, U.S.A., and photographed by Mi.ss D. S. Hone. 

 Natural size. 



the convoluted masses, some of which were 4 inches in diameter, 



and in (2) the more nearly spherical shape and much smaller size 



of the basidiospores. The basidiospores observed by Miss Hone 



were only 2-3 /x in diameter, whereas those of Burt, as we have seen, 



were 5-7 x 1 • 5-2 • 5 ix. 



In 1915, in his account of Exobasidium, Burt ^ excluded E. myce- 



tophilum from the genus and gave to the supposed parasite a new 



interpretation. Instead of regarding the excrescences as belonging 



^ D. S. Hone, loc. cit., p. 63. 



^ E.A.Burt, " The Thelephoraceae of North America, IV, Exobasidium." Ann. 

 Missouri Bot. Oard., vol. ii, 1915, p. 656. 



