518 FETCH : 



hyaline eonidia, 10 x 6-7 a, which the authors belieye were 

 identical with Massee's microconidia. 



It is to be noted that the eonidia observed by Prillieux and 

 Delacroix are styled " endocellular," because they were 

 formed within the decaying cane ; the term must not be 

 confused with " endoconidia," which has been appHed to the 

 spores of Thielaviopsis , because they a.re formed within the 

 hypha. Neither in the figures nor the text is there any indi- 

 cation that PriUieux and Delacroix saw eonidia produced 

 within the hyphse ; and the absence of any reference to this, 

 the most striking feature of Thielaviopsis, casts some doubt 

 upon their determination of their species. They did not 

 observe the characteristic odour in their cultures. 



Thiselton-Dyer. 



Howard's account of his investigations is prefaced by a 

 short summary by Sir W. T. Thiselton-Dyer (9), in which the 

 latter upholds Massee's view thskt' Thielaviopsis paradoxa is 

 genetically connected with Trichosphceria sacchari. He 

 cites Massee's experiment in which macro- and micro-conidia 

 of Thielaviopsis were produced in a flask culture started with 

 Melanconinm spores, and dismisses Went's suggestion, that 

 the culture was imj)ure, on the ground that the Melanconium 

 spores are produced on the exterior of the cane, while the 

 macroconidia of Thielaviopsis are produced only in the 

 interior, so that a mixture of the two is improbable. In this 

 respect, however, his information was incorrect, for the 

 macroconidia are produced in abundance on the exterior. 

 He also states that Howard obtained the macro- and micro- 

 conidia without difficulty by inoculating the interior of 

 healthy canes with Melanconium spores, and that Prillieux 

 and Delacroix appear to have been equally successful. 

 Howard, however, has since withdrawn his claim ; and the 

 reference to PriUieux and Delacroix is apparently based upon 

 a misinterpretation of their account. The latter authors 

 state (7) " En dehors de la forme Coniothyrium, le mycelium 

 nous a montre une forme conidienne endocellulaire deja 

 observee par M. Massee. Les conidies se produisent a 

 I'extremite des filaments myceliens dans les tissus de la canne 



