Arthoniomycetes

class of fungi

Written by

The Information Architects of Encyclopaedia Britannica

Last updated

July 17, 2026

Quick Summary

The class Arthoniomycetes is a group of fungi within the phylum Ascomycota. These fungi are primarily known for forming lichens, which are symbiotic associations between fungi and algae or cyanobacteria. A key characteristic of Arthoniomycetes is their unique asci, which are saclike structures that contain spores. These asci tend to elongate to discharge their spores.1

The classification of fungi is complex and evolving, with the kingdom Fungi divided into several phyla based on phylogenetic relationships. Arthoniomycetes is one of the classes within the subphylum Pezizomycotina, which encompasses many Ascomycota that produce ascocarps (fruiting bodies).231

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

5 Britannica Sources

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.

fungus
Annotated classification
Class Arthoniomycetes Forms lichens; contains 1 order. Order Arthoniales Forms lichens; produces asci that elongate to discharge spores; example genera include Arthonia, Dirina, and Roccella. Class Dothideomycetes Pathogenic, endophytic, or
Read More
Class Arthoniomycetes Forms lichens; contains 1 order. Order Arthoniales Forms lichens; produces asci that elongate to discharge spores; example genera include Arthonia, Dirina, and Roccella. Class Dothideomycetes Pathogenic, endophytic, or
Read More