ii8 Transactions British Mycological Society. 



hyaline conidiophores develop in a peculiar sympodial fashion 

 which give them a zig-zag appearance as illustrated in Fig. 12, 

 Plate III. 



The conidia are egg-shaped and brown in colour. The wall 

 is slightly thickened but it is not nearly so thick as would appear 

 from Miss vSmith's drawings. Nor is it so strongly thickened 

 as is shown in figures of the conidia of L. spinosa Ell. et Everh. 

 In young conidia the wall is quite smooth and not warty. In 

 old cultures the wall is slightly rough, but even in this condition 

 can scarcely be described as warted. Careful examination of 

 old conidia shows that the outermost portion of the wall is 

 not continuous over the whole conidium and the slight rough- 

 ness is due to this fact. 



The conidia germinate easily, a germ tube being produced 

 at the narrower end through a thin place in the wall at the 

 point where the conidium was attached to the conidiophore. 

 A germinating conidium is illustrated in Fig. 13, Plate III. 



Attempts were made to infect living potato leaves (both 

 intact and wounded) as well as stems and tubers, but without 

 success. The fungus is a saprophyte. 



As regards the systematic position of the fungus, it seems, 

 doubtful whether it should really be placed in the genus 

 Langloisula. Its conidiophores are not dichotomously branched 

 as in the type of that genus, and its conidia are not so thick 

 walled. Miss Smith and Mr. Ramsbottom suggested to me that 

 it would perhaps be better placed in the genus Monopodium 

 of Delacroix*. Material was sent to Paris for comparison 

 with Delacroix's specimens, but unfortunately no type material 

 of them had been preserved. 



M. Arnaud was good enough to look into the matter, however, 

 and found that the specimen sent agreed exactly with an 

 unpublished drawing by M. Griffon which the former believed 

 to represent Delacroix's Monopodium. M. Arnaud further 

 suggested that both the Monopodium of Delacroix and Langloi- 

 sula macrospora were probably identical with Acremoniella atra 

 Corda, and pointed out that the specimen of Langloisula for- 

 warded resembled Saccardo'sf drawing of this species rather 

 more closely than the original one of Cordai. 



In concluding these notes I desire to acknowledge gratefully 

 the assistance given me, in cultural and other work with the 

 organisms described, by Mr. H. A. Lafferty, A.R.C.Sc.L, who 

 was also good enough to prepare the drawings for the figures 

 on Plate III. 



* Bull. Soc. Myc. France, vi. 1890, p. 99. 



f Fungi Italic!. No. 713. 



X Icon. Fung. i. Tab. Ill, fig. 168. 



