Abstract
Forty-five clinical isolates ofMicrosporum gypseum were crossed with the + and − tester strains ofNannizzia gypsea, N. incurvata andN. fulva to determine their mating type. Thirty-two produced fertile gymnothecia when crossed withN. gypsea, of which 13 reacted as + and 19 as −. Ten produced fertile gymnothecia when crossed withN. incurvata, of which 7 reacted as + and 3 as −. The remaining 3 were sterile in all crosses withN. gypsea, N. incurvata andN. fulva. Of these 3, 2 were fluffy, degenerated cultures ofM. gypseum, and the other one appeared to be identical with the discription ofM. gypseum var.vinosum in cultural and morphological characteristics. There was approximately a 1∶1 overall ratio of mating types among a total of 90 clinical isolates ofM. gypseum in Japan on the basis of the above results and the data recently reported in the literature by other Japanese workers. The present results suggest that the ability to cause skin infection of humans by the soil-inhabitating organisms is approximately equal in the mating types and probably independent of sexuality.
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Hironaga, M., Tanaka, S. & Watanabe, S. Distribution of mating types among clinical isolates of theMicrosporum gypseum complex. Mycopathologia 77, 31–35 (1982). https://doi.org/10.1007/BF00588654
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DOI: https://doi.org/10.1007/BF00588654