Degree Name

Master of Science (MS)

Semester of Degree Completion


Thesis Director

Andrew S. Methven


Isolates of Chalara australis, Eucalypt Ceratocystis, and Ceratocystis virescens were grown on Potato Dextrose Agar, Malt Extract Agar, and Czapek Agar and examined as part of a biosystematic study on these fungi. Basic micromorphological and macromorphological data on the cultures were recorded and the taxa were found to be morphologically similar. Tissue isolates and single spore isolates were crossed within these taxa and an interspecific cross performed. Chalara australis was found to be either asexual or have only one mating type present in the cultures studied. Eucalypt Ceratocystis was found to have a mating system characteristic of bipolar heterothallism. Ceratocystis virescens was found to have no specific mating system. The interspecific cross generated data that indicates that these taxa are distinct species despite their morphological similarities.