Stilbum zacalloxanthum: Taxonomy, and Conidial Structure as Seen by Electron Microscopy of Thin Sections

Abstract

A new species of Stilbum, S. zacalloxanthum Moore, is described which, among other distinguishing attributes, has conidia the size and shape of bacilli. Examination of thin sections of these with an RCA EMU-2D electron microscope proves them, unlike bacteria, to be truly karyotic. Further, these nuclei are unique in that the nuclear content is differentiated into 2 different classes of material. The less dense and more coarsely granular material appears more centrally disposed while the denser and more finely granular material usually is arranged in several discrete peripheral zones. The significance of this unusual type of nucleus is uninterpretable at this time.