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Apiosordaria antarctica and Thielavia antarctica, two new ascomycetes from Antarctica

     Unitat de Microbiologia, Facultat de Medicina i Ciències de la Salut, C/ Sant Llorenç 21, 43201 Reus, Tarragona, Universitat Rovira i Virgili, Tarragona, Spain

Walter Mac Cormack

     Instituto Antártico Argentino, Departamento de Biología, C/ Cerrito 1248 (1010), Buenos Aires, Argentina

Two new species of ascomycetes, Apiosordaria antarctica, isolated from soil, and Thielavia antarctica, isolated from a sample of the lichen Usnea cf. aurantio-atra, both collected on King George Island (Antarctica), are described and illustrated. Apiosordaria antarctica is characterized by ostiolate ascomata with agglutinated hairs, eight-spored, uniseriate and cylindrical asci, and two-celled, irregularly navicular ascospores, with an upper cell ornamented with very small warts and with an apical germ pore. Thielavia antarctica is characterized by nonostiolate ascomata, with a thick peridium, eight-spored, cylindrical asci, uniseriate, oblate, ovoid ascospores, a slightly protruding apical germ pore, and a phialidic anamorph.

Key words: Chaetomiaceae, Lasiosphaeriaceae, lichenicolous fungi, soil-borne fungi, Sordariales, systematics