THAXTKK.— ARGENTINE LABOULBENIALES 179 



CORETHROMVCES Til. 



A comparison of now material from various parts of tlie world has 

 led me to the conclusion that the scope of this genus should be con- 

 siderably extended. Although those forms which, like the type, 

 occur on Cryptobia are all similar and are readily grouped in a section 

 by themselves, owing to the uniform characters of the appendages, 

 tiiere are other closely related forms or groups of forms, like those on 

 Stilici, as well as various undescribcfl species on somewhat varied 

 hosts, that do not seem to be distinguished from the type with suffi- 

 cient clearness to justify the erection of new genera for their reception. 

 As a result of this extension, it seems desirable, moreover, to discard 

 the genus Rhadinomi/ccs, which, though sufficiently well defined in 

 its typical conditions, varies to forms too near Cordhroinyccs for 

 proper separation. That this union might prove necessary, I have 

 already mentioned in my second Monograph (p. 317). 



A further complication in this connection has been encountered in 

 connection with the species of Sphalcromi/ccs, a type in wdiich the 

 antheridial characters are little known. The genus was based on S. 

 Lathrohii in which the antheridia appear to be solitary, but in a 

 majority of the species which have been described under this generic 

 name these organs have not been seen at all, or have been but doubt- 

 fully recognized: for the reason that the material has all been obtained 

 from dried insects, and was consequently for the most part in poor 

 condition. Among the South American forms are several which would 

 have been placed in this genus had it not been possible to determine 

 from the fresh alcoholic material, that the antheridial characters 

 were those of Corethromyces. The striking form for example, 

 described below from material growing on Pinophilus, is undoubtedly 

 congeneric with the two species formerly discovered on hosts of this 

 staphyline genus, namely S. occidentalis and S. indicus; but several 

 of the younger specimens obtained, in which the antheridia still per- 

 sist, show clearly the intercalary nature of the latter. S. QuedionucM 

 was also obtained both in Chile and in the Argentine, and although 

 the appendages here are densely tufted and small, a seriate disposi- 

 tion of the antheridia seems also to be present. Since, apart from the 

 supposed antheridial distinction, there are no essential differences 

 between Sphaleromyces and Corethromyces, the former genus must also 

 be abandoned. 



The genus Corethromyces thus modified, may be considered to 

 include those forms in wliich a two-celled receptacle gives rise to a free 



