IOO 



RESEARCHES ON FUNGI 



Macroscopic Observations on the Fall of Spores of Armillaria 

 mellea. The emission of spore-clouds from certain Polyporeae 

 growing under natural conditions has been observed macroscopically 

 by various observers : by Hoffmann 1 from Polyporus destructor ; by 

 Hermann von Schrenk 2 from P. Schweinitzii (Fig. 33) ; by myself 3 



FIG. 33. Polyporus Schweinitzii, growing upon the stump of a Pinus 

 sylvestris. H. von Schrenk, in the U.S.A., saw a fruit-body of this 

 species emitting clouds of spores. Photographed by Somerville 

 Hastings at Oxshott, Surrey, England. 



About -| natural size. 



and Brooks 4 from Polyporus squamosus ; by Stone 5 from Fomes 

 pinicola ; by Faull 6 and myself from F, fomentarius ; and by White 7 



1 H. Hoffmann, Jahrb. fur wiss. Bot,, Bd. II, 1860, p. 315. 



2 H. von Schrenk, " Some Diseases of New England Conifers," Bull. 25, U.S. 

 Dep. ofAgric., 1900, p. 22. 



3 A. H. R. Buller, vide these Researches, vol. i, 1909, pp. 89-93. Since 1909, 

 on three successive days, I saw dense spore-clouds passing away from a large 

 P. squamosus fruit-body situated on the trunk of an Elm, about 10 feet from the 

 ground, in the Priory Road at Kew. 



4 F. T. Brooks, " Notes on Polyporus squamosus Huds.," The New Phytologist, 

 vol. viii, 1909, p. 350. 



5 R. E. Stone, " Visible Spore-Discharge in Fomes pinicola," Trans. Brit. Myc. 

 Soc., vol. vi, 1920, p. 294. 



6 Vide infra. 



7 J. H. White, " On the Biology of Fomes applanatus," Trans. Boy. Can. Institute, 

 Toronto, 1919, p. 140. 



