# Diorygma archeri

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Species of lichen

Diorygma archeri Scientific classification Kingdom: Fungi Division: Ascomycota Class: Lecanoromycetes Order: Graphidales Family: Graphidaceae Genus: Diorygma Species: D. archeri Binomial name Diorygma archeri S.Joshi & Hur (2013)

***Diorygma archeri*** is a species of [corticolous](/source/Corticolous_lichen) (bark-dwelling) [lichen](/source/Lichen) in the family [Graphidaceae](/source/Graphidaceae).[1] Found in Vietnam, it was [formally described](/source/Species_description) as a new species in 2013 by Santosh Joshi and Jae-Seoun Hur. The [type specimen](/source/Type_(biology)) was collected from [Yok Đôn National Park](/source/Yok_%C4%90%C3%B4n_National_Park) ([Đắk Lắk province](/source/%C4%90%E1%BA%AFk_L%E1%BA%AFk_province)) at an altitude of about 760 m (2,490 ft). The [species epithet](/source/Botanical_name) honours Australian lichenologist [Alan W. Archer](/source/Alan_W._Archer).[2]

## Description

*Diorygma archeri* has a flat [thallus](/source/Thallus) that is usually white or grayish-green in color and up to 800 [μm](/source/Micrometre) thick. The outer layer of the lichen (the [pseudocortex](/source/Glossary_of_lichen_terms#pseudocortex)) is distinct, reaching up to 30 μm. The [algal layer](/source/Glossary_of_lichen_terms#algal_layer) is well-developed and about 50–60 μm thick. The inner layer, the [medulla](/source/Medulla_(lichenology)), is white and thick, with crystals scattered throughout it.[2]

The fruiting bodies of the lichen, called [ascomata](/source/Ascomata), are numerous and can vary in shape, with some being short and curved while others are more branched. They are covered by a brownish or reddish-brown layer that is surrounded by a raised, irregular margin. The [hymenium](/source/Hymenium), which is the part of the ascomata that contains the spores, is [hyaline](/source/Hyaline) and can be seen to be violet-blue when treated with certain chemicals. The spores themselves are oval to elliptic in shape, multicellular, and range in size from 150 to 255 x 53 to 85 μm.[2]

*Diorygma archeri* contains [protocetraric acid](/source/Protocetraric_acid), a [lichen product](/source/Lichen_product) that can be detected using [thin-layer chromatography](/source/Thin-layer_chromatography).[2]

*Diorygma archeri* is comparable to *[Diorygma pruinosum](https://en.wikipedia.org/w/index.php?title=Diorygma_pruinosum&action=edit&redlink=1)*, but the two differ in several ways. Specifically, *D. archeri* has a thick, distinctly corticate body that is grayish-green in color and contains a well-developed medulla. The apothecial [disc](/source/Glossary_of_lichen_terms#disc) of *D. archeri* is only slightly open, and its [proper exciple](/source/Glossary_of_lichen_terms#proper_exciple) is not [carbonized](/source/Glossary_of_lichen_terms#carbonized). Additionally, *Diorygma archeri* has larger ascospores than *D. pruinosum*.[2]

## References

1. **[^](#cite_ref-CoL_1-0)** ["*Diorygma archeri* S. Joshi & Hur"](https://www.catalogueoflife.org/data/taxon/36C2D). *[Catalogue of Life](/source/Catalogue_of_Life)*. [Species 2000](/source/Species_2000): Leiden, the Netherlands. Retrieved 15 March 2022.

1. ^ [***a***](#cite_ref-Joshi_et_al._2013_2-0) [***b***](#cite_ref-Joshi_et_al._2013_2-1) [***c***](#cite_ref-Joshi_et_al._2013_2-2) [***d***](#cite_ref-Joshi_et_al._2013_2-3) [***e***](#cite_ref-Joshi_et_al._2013_2-4) Joshi, Santosh; Jayalal, Udeni; Oh, Soon-Ok; Koh, Young Jin; Nguyen, Thi Thuy; Dzung, Nguyen Anh; Hur, Jae-Seoun (2013). "New species and new records in the family Graphidaceae (Ascomycota: Ostropales) from Vietnam". *The Lichenologist*. **45** (5): 599–609. [doi](/source/Doi_(identifier)):[10.1017/s002428291300025x](https://doi.org/10.1017%2Fs002428291300025x).

Taxon identifiers Diorygma archeri Wikidata: Q107638472 CoL: 36C2D GBIF: 10826540 IndexFungorum: 803519 MycoBank: 803519 SpeciesFungorum: 803519

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