Jan. IS, 1920 Further Studies of Sorosporella uvella 415 



these bodies present, it became milky white in color. He also noted that 

 the circulation of the blood was an important factor in the distribution 

 of the blastocysts, and that it gradually became absorbed, so that when 

 an insect was pricked with a needle in later stages of the disease no liquid 

 emerged. When the cylindrical conidia had completed their develop- 

 ment, however, instead of rounding up to form chlamydospores, as do 

 the similar bodies of Sorosporella, the bodies were observed by De Bary 

 to lengthen out, become septate and branched, and otherwise assume the 

 form of branching hyphae. 



It should be stated, however, that the "cylindrical conidia" were 

 considered by this author to be homologous with those formed in the 

 air, for he says (translation) : 



The cylindrical conidia are typical organs of our fungus whose development is aided 

 or reduced according to the nature of the surrounding medium, not dependent upon 

 it, for they arise constantly as the first product of the germ tubes, in the air as well as 

 in a fluid medium. 



While this may be true with Botrytis bassiana, which the writer has 

 not yet studied in detail, the blastocysts of Sorosporella obviously can 

 not be homologized with its aerial conidia, because the power which the 

 blastocysts possess of reproducing their kind by yeastlike budding is not 

 shared by the conidia, which furthermore are quite different in form. 



De Bary also calls attention to the fact that Audouin (i) as early as 

 1837 probably saw the cutting off of cylindrical conidia in the blood of 

 silkworms infected by Botrytis bassiana, and that, according to Robin (15), 

 Guerin Meneville undoubtedly found them, though erroneously claiming 

 that they "arose from the granules contained in the blood corpuscles." 

 On account of their supposed origin Guerin Meneville called them " Hsem- 

 atozoidia," a name which can not be employed at the present time in the 

 light of more recent investigations. 



While these earlier authors undoubtedly saw the free-floating fungus 

 cells, Vittadini (23), according to De Bary (2), first realized their sig- 

 nificance because he followed them through the various stages in their 

 development more closely than did any of his predecessors. 



Recent literature, however, is entirely lacking in reference to these 

 peculiar free-floating vegetative cells; and only when the older papers 

 were examined by the writer, after these investigations were completed, 

 did it become evident that they were not entirely unknown among 

 entomogenous fungi. 



Through the lack of special study of their vegetative phases, as well as 

 ignorance of the older literature, it has been generally supposed in recent 

 years that entomogenous Hyphomycetes as a class vegetate within 

 insects by branching hyphge. It is possible that such a method of growth 

 obtains in certain entomogenous species, but in Sorosporella ^ivclla , J saria 

 jarinosa, and Botrytis bassiana bodies are formed which seem especially 

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