A NEW PLEOMORPHIC ASCOMYCETE, CALYPTROZYMA-ARXII GEN ET SP-NOV, ISOLATED FROM THE HUMAN LOWER ESOPHAGUS

A new pleomorphic ascomycete, Calyptrozyma arxii, isolated from the hu man lower oesophagus, is described. Initial growth results in yeast ce lls, followed by formation of hyphae. Asexual reproduction occurs by b lasto-, aleurio- and arthroconidia In addition, unicellular to multice llular conidia-like cells occur, which initially are somewhat thick-wa lled. Finally, the outer wall layers of these cells become loose. Sexu al reproduction is by eight-spored asci formed on aggregations of gene rative hyphae. Although no ascomata are formed, the fungus belongs to the Euascomycetes, as was deduced from septal ultrastructure and parti al ribosomal RNA sequences.