Abstract

Phialocephala dimorphospora , the type species of Phialocephala , has long tubular collarettes and appears to produce conidia in chains. These characteristics are reminiscent of ring wall building development as found in the genus Sporendocladia . Scanning and transmission electron microscopy has reconfirmed that conidia in P. dimorphospora are formed by apical wall building and are thus fundamentally distinct from Sporendocladia . Furthermore, periclinal thickening in P. dimorphospora is significantly different from that found in other phialidic fungi. In this fungus, wall remnants remain after delayed secession and premature conidial proliferation. This is in contrast to the periclinal thickening in other phialidic fungi which is formed during the proliferation stage and not the delimitation and secession stage. New terminology is introduced to distinguish the unique mode of conidium development in P. dimorphospora from that found in other phialidic fungi.

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