FIGURE 4 in Rhytidhysteron mexicanum sp. nov. (Dothideomycetes, Ascomycota) from the Sierra of Guadalupe, Trans Mexican Volcanic Belt

FIGURE 4. Microscopical features of Rhytidhysteron mexicanum stained with alcohol (70%) and KOH (10%) reagent. A. Hysterothecium cross-section without KOH. B. Hysterothecium cross-section with KOH. C. Hysterothecium cross section, showing the epithecium, haemathecium (hymenium), exciple and subhymenium. D. Exciple of iso-diametric cells (globulosa-angularis) close-up. E. Asci and ascospores. F. Peridium of iso-radiating cells (textura prismatica) close-up. G. Pseudoparaphyses. H. Ascospores.