Ascospores, Germ Pores, Ultrastructure, and Thermophilism of Chaetomium

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Abstract
Ascospores of 15 isolates of C. thermophile were compared with those of 105 other Chaetomium spp. by use of light microscopy and scanning electron microscopy. Two stable characteristics distinguished C. thermophile ascospores from those of all other Chaetomium species examined: a papillate germ pore and pustulate surface ornamentation. Transmission electron microscopy revealed multilayered walls in ascospores of C. semen-citrulli and C. thermophile. Germ pores were confirmed as thin areas in ascospore wall layers. Germinated ascospores of C. semen-citrulli contained several nuclei, mitochondria, fibrillar bundles, vacuoles and glycogen-like particles.