The fungal genus Sabuloglossum (earth tongues) was originally described as a monotypic genus based on the species Geoglossum (Microglossum) arenarium.
It typically occupies sandy coastal habitats and forms mycorrhizas withEmpetrum nigrum (Ericaceae). While studying material from central Europe (Czech Republic, Slovakia, Austria, and Germany), ascomata morphologically very similar to S. arenarium were observed. They were ecologically limited to mid-altitudinal mountainous habitats and associated with Calluna vulgaris or Vaccinium sp. pl. (Ericaceae). The relationship to S. arenarium and related genera was evaluated using a combination of genetic (nrITS1-5.8S-ITS2 and the 28S nrLSU regions) and comparative morphological analysis. Macro-and micromorphological investigations revealed that mountain populations differ from typical S. arenarium in longer apical cells of paraphyses, more frequently septated ascospores, and the presence of inflated cells in the stipe squamules.