Abstract
The subcellular events of ascosporogenesis in the thermophile Thermoascus aurantiacus were similar to those described for other mesophilic Ascomycotina. Asci arose singly from croziers formed by ascogenous hyphae which ramified irregularly throughout the central cavities of cleistothecia. Ascospores were delimited by the progressive invagination of a pair of unit membranes. Cell-wall formation took place between these ascospore-delimiting membranes and consisted of an electron-transparent endospore and an electron-dense epispore. At ascospore maturity, the asci underwent lysis, thereby releasing their ascospores into the central cavity of the cleistothecia.
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