''Myriostigma'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

lichen A lichen ( , ) is a hybrid colony (biology), colony of algae or cyanobacteria living symbiotically among hypha, filaments of multiple fungus species, along with yeasts and bacteria embedded in the cortex or "skin", in a mutualism (biology), m ...

s in the family

Arthoniaceae The Arthoniaceae are a family (biology), family of lichenized, Lichenicolous fungus, lichenicolous and saprobic fungi in the order Arthoniales. The Arthoniaceae is the largest family of Arthoniales, with around 800 species. Most species in Arthon ...

. The genus was

circumscribed In geometry, a circumscribed circle for a set of points is a circle passing through each of them. Such a circle is said to ''circumscribe'' the points or a polygon formed from them; such a polygon is said to be ''inscribed'' in the circle. * Circum ...

by German lichenologist

August von Krempelhuber August von Krempelhuber (14 September 1813 – 2 October 1882) was a German lichenologist born in Munich. Born into nobility, he studied forestry at the University of Munich. Through his work in forestry, he developed an interest in lichens, sub ...

in 1874. Characteristics of ''Myriostigma'' include the raised maculate (spots),

ascomata An ascocarp, or ascoma (: ascomata), is the fruiting body (sporocarp (fungi), sporocarp) of an ascomycete phylum fungus. It consists of very tightly interwoven hyphae and millions of embedded ascus, asci, each of which typically contains four to ...

-like fertile areas, asci that are 8-spored, thick-walled, globular and stalked, and

ascospore In fungi, an ascospore is the sexual spore formed inside an ascus—the sac-like cell that defines the division Ascomycota, the largest and most diverse Division (botany), division of fungi. After two parental cell nucleus, nuclei fuse, the ascu ...

s that are

hyaline A hyaline substance is one with a glassy appearance. The word is derived from , and . Histopathology Hyaline cartilage is named after its glassy appearance on fresh gross pathology. On light microscopy of H&E stained slides, the extracellula ...

, bean-shaped, and muriform (divided into chambers by

septa SEPTA, the Southeastern Pennsylvania Transportation Authority, is a regional public transportation authority that operates bus, rapid transit, commuter rail, light rail, and electric trolleybus services for nearly four million people througho ...

Species

Species Fungorum ''Index Fungorum'' is an international project to index all formal names (Binomial nomenclature, scientific names) in the fungus Kingdom (biology), kingdom. As of 2015, the project is based at the Royal Botanic Gardens, Kew, one of three partn ...

(in the

Catalogue of Life The Catalogue of Life (CoL) is an online database that provides an index of known species of animals, plants, fungi, and microorganisms. It was created in 2001 as a partnership between the global Species 2000 and the American Integrated Taxono ...

) accepts nine species of ''Myriostigma''. *'' Myriostigma candidum'' *'' Myriostigma filicinum'' *'' Myriostigma irregulare'' *'' Myriostigma miniatum'' *'' Myriostigma minisorediatum'' – Brazil *'' Myriostigma napoense'' *'' Myriostigma nicobaricum'' – India *'' Myriostigma subcandidum'' *'' Myriostigma xanthominiatum'' – Brazil *'' Myriostigma xanthonicum'' – Brazil The species once known as ''Myriostigma guatteriae'' is now '' Myriostigmella guatteriae''.

References

{{Taxonbar, from=Q107279437 Arthoniaceae Arthoniomycetes genera Lichen genera Taxa described in 1874 Taxa named by August von Krempelhuber