{{Short description|Species of lichen}} {{Use dmy dates|date=March 2023}} {{Speciesbox | image = | image_caption = | taxon = Diorygma archeri | authority = S.Joshi & Hur (2013) }}

'''''Diorygma archeri''''' is a species of [[corticolous lichen|corticolous]] (bark-dwelling) [[lichen]] in the family [[Graphidaceae]].<ref name="CoL"/> Found in Vietnam, it was [[species description|formally described]] as a new species in 2013 by Santosh Joshi and Jae-Seoun Hur. The [[type (biology)|type specimen]] was collected from [[Yok Đôn National Park]] ([[Đắk Lắk province]]) at an altitude of about {{convert|760|m|ft|abbr=on}}. The [[botanical name|species epithet]] honours Australian lichenologist [[Alan W. Archer]].<ref name="Joshi et al. 2013"/>

==Description==

''Diorygma archeri'' has a flat [[thallus]] that is usually white or grayish-green in color and up to 800&nbsp;[[micrometre|μm]] thick. The outer layer of the lichen (the {{lichengloss|pseudocortex}}) is distinct, reaching up to 30&nbsp;μm. The {{lichengloss|algal layer}} is well-developed and about 50–60&nbsp;μm thick. The inner layer, the [[medulla (lichenology)|medulla]], is white and thick, with crystals scattered throughout it.<ref name="Joshi et al. 2013"/>

The fruiting bodies of the lichen, called [[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]], which is the part of the ascomata that contains the spores, is [[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&nbsp;μm.<ref name="Joshi et al. 2013"/>

''Diorygma archeri'' contains [[protocetraric acid]], a [[lichen product]] that can be detected using [[thin-layer chromatography]].<ref name="Joshi et al. 2013"/>

''Diorygma archeri'' is comparable to ''[[Diorygma pruinosum]]'', but the two differ in several ways. Specifically, ''D.&nbsp;archeri'' has a thick, distinctly corticate body that is grayish-green in color and contains a well-developed medulla. The apothecial {{lichengloss|disc}} of ''D.&nbsp;archeri'' is only slightly open, and its {{lichengloss|proper exciple}} is not {{lichengloss|carbonized}}. Additionally, ''Diorygma archeri'' has larger ascospores than ''D.&nbsp;pruinosum''.<ref name="Joshi et al. 2013"/>

==References== {{Reflist|refs=

<ref name="CoL">{{Catalogue of Life |id=36C2D |title=''Diorygma archeri'' S. Joshi & Hur |access-date=15 March 2022}}</ref>

<ref name="Joshi et al. 2013">{{cite journal |last1=Joshi |first1=Santosh |last2=Jayalal |first2=Udeni |last3=Oh |first3=Soon-Ok |last4=Koh |first4=Young Jin |last5=Nguyen |first5=Thi Thuy |last6=Dzung |first6=Nguyen Anh |last7=Hur |first7=Jae-Seoun |title=New species and new records in the family Graphidaceae (Ascomycota: Ostropales) from Vietnam |journal=The Lichenologist |volume=45 |issue=5 |year=2013 |doi=10.1017/s002428291300025x |pages=599–609}}</ref>

}}

{{Taxonbar|from=Q107638472}}

[[Category:Diorygma|archeri]] [[Category:Lichen species]] [[Category:Lichens described in 2013]] [[Category:Lichens of Indo-China]] [[Category:Taxa named by Jae-Seoun Hur]]