# Myeloconis

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Genus of lichens

Myeloconis Scientific classification Kingdom: Fungi Division: Ascomycota Class: Lecanoromycetes Order: Gyalectales Family: Porinaceae Genus: Myeloconis P.M.McCarthy & Elix (1996) Type species Myeloconis fecunda P.M.McCarthy & Elix (1996) Species M. erumpens M. fecunda M. guyanensis M. parva

***Myeloconis*** is a [genus](/source/Genus) of [corticolous](/source/Corticolous_lichen) (bark-dwelling), [crustose lichens](/source/Crustose_lichen) in the family [Porinaceae](/source/Porinaceae). It has four species.[1] The genus was [circumscribed](/source/Circumscription_(taxonomy)) in 1996 by Patrick M. McCarthy and [John Elix](/source/John_Alan_Elix), with *[M. fecunda](/source/Myeloconis_fecunda)* assigned as the [type species](/source/Type_species). The genus name, derived from the [Greek](/source/Ancient_Greek) *myelos* ("marrow", or "pith") and *konis* ("dust"), refers to the powdery yellow-orange [pigments](/source/Biological_pigment) in the [medulla](/source/Medulla_(lichenology)).[2]

## Description

Genus *Myeloconis* is characterised by several unique features. These include a medulla that contains yellow or orange [pigments](/source/Biological_pigment) that have not been seen in other lichen species before. The fruiting bodies of *Myeloconis*, known as [perithecioid ascomata](/source/Glossary_of_lichen_terms#perithecium), have a dark, dense, and almost [pseudostromata](/source/Glossary_of_lichen_terms#pseudostromata)l wall. The [hamathecium](/source/Glossary_of_lichen_terms#hamathecium), which is the part of the ascoma that supports the spores, is free and anastomoses at the base. The [asci](/source/Ascus) are uniformly thin-walled, and the [ascospores](/source/Ascospore) are elongate and [muriform](/source/Glossary_of_lichen_terms#muriform).[2]

Although the exact relationship of *Myeloconis* to other lichen genera is not certain, the characteristics of the fruiting bodies and their contents suggest that *Myeloconis* may be closely related to the genera *[Porina](/source/Porina)* and *[Clathroporina](/source/Clathroporina)* in the family Porinaceae.[2]

## Chemistry

The new [phenalenone](https://en.wikipedia.org/w/index.php?title=Phenalenone&action=edit&redlink=1) compound, myeloconone A2 (6,7,9-trihydroxy-3,8-dimethoxy-4-methyl-1H-phenalen-1-one), was isolated from *Myeloconis erumpens*. It is a deep yellow pigment.[3] [Leucomyeloconone](https://en.wikipedia.org/w/index.php?title=Leucomyeloconone&action=edit&redlink=1) and [myelocoterpene](https://en.wikipedia.org/w/index.php?title=Myelocoterpene&action=edit&redlink=1) are other [lichen products](/source/Lichen_product) found in the genus.[2]

## Species

*Myeloconis* species occur in lowland tropical forest.[2]

- *[Myeloconis erumpens](/source/Myeloconis_erumpens)* P.M.McCarthy & Elix (1996) – Papua New Guinea

- *[Myeloconis fecunda](/source/Myeloconis_fecunda)* P.M.McCarthy & Elix (1996) – Malaysia

- *[Myeloconis guyanensis](/source/Myeloconis_guyanensis)* P.M.McCarthy & Elix (1996) – Guyana

- *[Myeloconis parva](/source/Myeloconis_parva)* P.M.McCarthy & Elix (1996) – Brazil

## References

1. **[^](#cite_ref-Wijayawardene_et_al._2022_1-0)** Wijayawardene, N.N.; Hyde, K.D.; Dai, D.Q.; Sánchez-García, M.; Goto, B.T.; Saxena, R.K.; et al. (2022). ["Outline of Fungi and fungus-like taxa – 2021"](https://www.researchgate.net/publication/358798332). *Mycosphere*. **13** (1): 53–453. [doi](/source/Doi_(identifier)):[10.5943/mycosphere/13/1/2](https://doi.org/10.5943%2Fmycosphere%2F13%2F1%2F2). [hdl](/source/Hdl_(identifier)):[10481/76378](https://hdl.handle.net/10481%2F76378). [S2CID](/source/S2CID_(identifier)) [249054641](https://api.semanticscholar.org/CorpusID:249054641).

1. ^ [***a***](#cite_ref-McCarthy_&_Elix_1996_2-0) [***b***](#cite_ref-McCarthy_&_Elix_1996_2-1) [***c***](#cite_ref-McCarthy_&_Elix_1996_2-2) [***d***](#cite_ref-McCarthy_&_Elix_1996_2-3) [***e***](#cite_ref-McCarthy_&_Elix_1996_2-4) McCarthy, P.M.; Elix, J.A. (1996). "*Myeloconis*, a new genus of pyrenocarpous lichens from the tropics". *The Lichenologist*. **28** (5): 401–414. [doi](/source/Doi_(identifier)):[10.1006/lich.1996.0038](https://doi.org/10.1006%2Flich.1996.0038). [S2CID](/source/S2CID_(identifier)) [86208164](https://api.semanticscholar.org/CorpusID:86208164).

1. **[^](#cite_ref-Ernst-Russell_et_al._2000_3-0)** Ernst-Russell, Michael A.; Chai, Christina L.L.; Elix, John A.; McCarthy, Patrick M. (2000). "Myeloconone A2, a new phenalenone from the lichen *Myeloconis erumpens*". *Australian Journal of Chemistry*. **53** (12): 1011–2013. [doi](/source/Doi_(identifier)):[10.1071/ch00139](https://doi.org/10.1071%2Fch00139).

Taxon identifiers Myeloconis Wikidata: Q10591664 Wikispecies: Myeloconis AusLichen: 30018522 EoL: 22940 EPPO: 1MYLCG GBIF: 2601534 IndexFungorum: 27613 IRMNG: 1076727 MycoBank: 27613 NCBI: 1457643 Open Tree of Life: 4067576 SpeciesFungorum: 27613

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