Abstract
The dimorphism of Microascus cirrosus was observed using the agar-implantation method. Two cultures of M. cirrosus converted from hyphae to yeast-like cells via relatively large spherical cells looking like chlamydospore due to the following two processes. One was that hyphae swelled and formed intercalary and terminal chlamydospore-like cells. Then, their number increased and chains of spherical cells were formed. They separated from each other. The other was that some parts of hyphal walls ballooned and chlamydospore-like cells were produced on the lateral wall. Then, they were released from the wall and each spherical cell was arranged along with the hyphae. These spherical cells budded and formed clusters of yeast-like cells until the 5th week. These conversions occurred at the periphery of the agar blocks rather than at their centers. However, the spherical cells and yeast-like cells were destroyed in the granulomatous tissue surrounding the agar blocks.
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