ascoma is composed of high branching and complex anastomosed hyphae. The interior chamber of the ascoma, filled with calcite, preserves several asci and a number of ascospores. Though the asci are faint the groupings of ascospores are well preserved showing the placement of the asci to be basal. Each ascospore is between 55 and 90 μm and dictyosporous. The specimen was studied by cutting the calcareous nodule into slices with a rock saw and using the cellulose acetate peel technique to create slides that were examined under stereo microscope. With its distinct basal asci placement and dictyosporous ascospores, combined with the ascoma growing within existing tissues, Margaretbarromyces distinct from known genera. Though several other fungal orders have some similar characters the particular grouping found in Margaretbarromyces is closest to members of the Pleosporales. Placement at the family level is uncertain due to the fluctuating nature of the family descriptions. References External links †Margaretbarromyces †Margaretbarromyces Prehistoric fungi Fossil taxa described in 2007 Eocene life Flora of British Columbia Paleogene fungi Monotypic Basidiomycota genera