Myriostigma

Myriostigma is a genus of lichens in the family Arthoniaceae. The genus was circumscribed by German lichenologist August von Krempelhuber in 1874.

Characteristics of Myriostigma include the raised maculate (spots), ascomata-like fertile areas, asci that are 8-spored, thick-walled, globular and stalked, and ascospores that are hyaline, bean-shaped, and muriform (divided into chambers by septa).

Species
, Species Fungorum (in the Catalogue of Life) accepts nine species of Myriostigma:


 * Myriostigma candidum Kremp. (1874)
 * Myriostigma filicinum (Ellis & Everh.) Frisch & G.Thor (2014)
 * Myriostigma irregulare (Lücking, Aptroot, Kalb & Elix) Frisch & G.Thor (2014)
 * Myriostigma miniatum (Vain. ex Lücking) Aptroot, Ertz, Grube & M.Cáceres (2015)
 * Myriostigma napoense (Kalb & Jonitz) Kukwa (2015)
 * Myriostigma nicobaricum Jagadeesh & G.P.Sinha (2016) – India
 * Myriostigma subcandidum (M.Cáceres & Lücking) Frisch & G.Thor (2014)
 * Myriostigma xanthominiatum Aptroot & M.F.Souza (2021) – Brazil
 * Myriostigma xanthonicum Aptroot & M.Cáceres (2018) – Brazil

The species once known as Myriostigma guatteriae G.Arnaud (1925) is now Myriostigmella guatteriae.