M. antarctica M. borealis M. georgica M. mawsonii M. mexicana M. tessellata Mastodia is a genus of lichen-forming fungi in the family Verrucariaceae.

It forms a symbiotic association with the macroscopic genus Prasiola; this is the only known lichen symbiosis involving a foliose green alga.

[4] Studies suggest that throughout its geographic range, the lichen comprises two fungal species (the mycobionts) and three algal lineages (the photobionts) that associate.

Over a century later, molecular phylogenetics analysis demonstrated that Mastodia tessellata belongs to the family Verrucariaceae, and has a sister taxon relationship with the marine genus Wahlenbergiella.

[6] Mastodia has a foliose (leaf-like) thallus, which is either umbilicate (attached at a single point like a navel) or stalked, with a somewhat uneven or mixed structure.