SummaryA new species ofPseudoarachniotus, P. reticulatus, is described and illustrated. The developmental morphology is discussed and illustrated and the fungus is shown to be homothallic.P. reticulatusis distinguished from the other two species of the genus,P. roseusandP. citrinus, by its globose, reticulate ascospores, the presence of radiating red-capped hyphae among the tufts of asci, as well as by certain color differences.