Inoderma

Inoderma is a genus of lichen-forming fungi in the family Arthoniaceae. First named by Erik Acharius in 1810 and formally published at genus rank by Samuel Frederick Gray in 1821, the genus was resurrected in 2015 for a small group of species characterised by elevated, white frost-like pycnidia (asexual fruiting bodies) and white-dusted apothecia (sexual fruiting bodies). These lichens typically form broad, pale whitish to light olive-grey patches on bark or other substrates, partnering with the orange-pigmented green alga Trentepohlia as their photosynthetic partner. The genus comprises seven described species, most of which are bark-dwelling lichens of long-undisturbed, old-tree woodland, including old-growth temperate forests. It has a mainly temperate distribution across the Northern Hemisphere and Australasia, with one species known from afromontane rainforest in East Africa.