[Vor. 8 
268 ANNALS OF THE Missourt BOTANICAL GARDEN 
of Oospora tonsurans with Ctenomyces rests on the simi- 
larity of characters in the conidial stage of development. In 
old cultures of O. tonsurans may be found multicellular 
chlamydospores, spindle-spores, and serrate septate hyphae. 
This fungus, according to Matruchot and Dassonville, is an 
imperfect form of a species of Ctenomyces, still unknown, 
which has adopted a parasitic mode of development and con- 
sequently has lost the faculty of producing perithecia and 
ascospores. The serrate spiral hyphae, present in cultures 
of O. tonsurans, are considered as traces of asci formation. 
O. tonsurans (Malmsten) Saee. & Trav. in басс. Syll. Fung. 
20:236. 1911. 
The mycelium of this fungus usually fills the entire hair 
without having passed through the cuticle. The filaments 
are more often simple, rarely dichotomously branched. The 
fungus is made up of squarish cells 4-би long, arranged in 
chains that follow the direction of the hair. 
O. porriginis (Mont. & Berk.) басс. Syll. Fung. 4:15. 1886. 
Oidium porriginis Robin, Veg. Par. 477-488. 1853. 
Gruby (743) demonstrated that the fungous parasite which 
he had independently found in Тале lesions, was the cause 
of the affection, and in the following year made successful 
inoculations with this fungus in the human skin and the skin 
of animals. In 1845 Remak separated the fungus from the 
genus Oidiwm to which it had been assigned, and created the 
genus Achorion, with the name Achorion Schonleini for this 
specific fungus. The characteristic lesion is a small yellow 
disc with a eup-like depression in the center. Both in color 
and in shape, it resembles a honeycomb, hence the name 
which comes from the Arabie Sahafts, meaning honeycomb. 
In the middle ages the disease was called tinea, which name 
is still retained. Matruchot and Dassonville (’99) also con- 
sider O. porriginis as belonging to the family Gymnoascaceae, 
but this classification cannot be regarded seriously. 
SPOROTRICHUM 
S. (Microsporon) Audouini Gruby, Compt. rend. Acad. 
Paris 17:301-303. 1843. 
