522 FETCH : 



opinion. Tlie mycelium was hyaline or slightly brownish, 

 3-5 [I tliick, and not much branched, the branches being 

 almost at right angles to the main hyphse. The conidiferous 

 lijqDhse were perpendicular to the substratum, pale brown, 

 usually simple and scattered, up to more than 200 tx long ; 

 they were 8-12 ^ in diameter below and 4-5 a above, and 

 furnished with one to three cross walls towards the base. 

 The apices of the conidiferous hyphse were without exception 

 open, and the spores were formed within the hyphse. In some 

 cases these erect hyphae were massed together into cushions 

 on a foundation of interwoven hyphse. (This is the only record 

 of any form resembling de Seynes " Stysanus " form. It is 

 curious that it should only have been observed in " wild " growths 

 in temperate climates, prior to recent observations in Ceylon.) 



The spores were either thin- walled, hyaline, shortly cylin- 

 dric, 10 X 5 [JL {i.e., microconidia), or elliptical, black-brown, 

 almost opaque, tliick- walled, 10-18 X 7-10| ^, generally 

 12 X 8-9 tji, {i.e., macroconidia). All intermediate stages 

 between these two extremes occurred. According to von 

 Hohnel, the dark spore can develop from the liy aline. In 

 some cases the whole chain of spores was hyaline ; in others it 

 was partly hyaline and partly dark, while black spores were 

 sometimes found within the hypha. He states that the 

 hyaline spores are not a separate form, but only a stage in 

 the development of the dark spores ; and refers to the general 

 occurrence of hyaline spores in other dark-spored conidial 

 species. The fully developed spores are, according to his 

 view, brown. He declares that Went's statement that the 

 macroconidia are formed in a different way from the micro- 

 conidia is an error, but it is clear that he did not see the 

 macroconidiophores, and hence could not distinguish between 

 the two kinds of conidia. 



Cohh. 



Cobb examined Thielaviopsis paradoxa in connection with 

 sugar cane (14) and pineapple (15) diseases in Hawaii. He 

 states that the mycelium, at first colourless, becomes at last 

 light or dark brown, though never the latter colour except in 

 the fully decomposed tissues of the heart of the cane ; it varied 

 in thickness from 3 to 8 [x. 



