{{Short description|Species of lichen-forming fungus}} {{Use dmy dates|date=June 2023}} {{Speciesbox | image = | image_caption = | taxon = Diorygma sticticum | authority = Sutjar., [[Klaus Kalb|Kalb]] & [[Robert Lücking|Lücking]] (2011) }}
'''''Diorygma sticticum''''' is a species of [[corticolous lichen|corticolous]] (bark-dwelling) [[script lichen]] in the family [[Graphidaceae]].<ref name="CoL"/> It was [[species description|described]] as new to science in 2011. It is found in [[lowland]] rainforests in [[Thailand]], and in southwestern India.
==Taxonomy== ''Diorygma sticticum'' was first [[species description|described]] as a new species by lichenologists Jutarat Sutjaritturakan, [[Klaus Kalb]], and [[Robert Lücking]] in 2011. The [[type (biology)|type specimen]] was found in [[Khao Yai National Park]] in [[Nakhon Ratchasima province]], Thailand. The [[botanical name|species epithet]], ''sticticum'', refers to its unique [[secondary metabolism|secondary chemistry]].<ref name="Lumbsch et al. 2011"/>
==Description== ''Diorygma sticticum'' has a corticolous [[thallus]] that can grow up to {{convert|5|cm|in|abbr=on|0}} in diameter and is 70–150 [[micrometre|μm]] thick. When viewed in cross-section, the thallus reveals an upper cortex measuring 10–15 μm thick, an uneven {{lichengloss|algal layer}}, and groups of [[calcium oxalate]] crystals. It has a smooth to uneven, light green surface, occasionally accompanied by a white [[prothallus#In lichens|prothallus]]. The species forms dense clusters of stellate {{lichengloss|lirellae}}, which range from 1–3 mm in length, 0.15–0.3 mm in width, and 0.1 mm in height. These lirellae have a distinct white {{lichengloss|thalline margin}} and a concealed to partly exposed, pale brown {{lichengloss|disc}} that is thickly white-{{lichengloss|pruinose}}. The colourless {{lichengloss|ascospores}} are 10–13 by 6–8 μm in size, with a strong I+ violet-blue reaction when [[staining|stained]] with [[iodine]].<ref name="Lumbsch et al. 2011"/>
The presence of [[stictic acid|stictic]], [[hypostictic acid|hypostictic]], and [[cryptostictic acid]]s is a notable feature of ''Diorygma sticticum''. These [[lichen product]]s contribute to the species' distinctive characteristics and differentiate it from other lichens within its genus.<ref name="Lumbsch et al. 2011"/>
''Diorygma sticticum'' is closely related to ''[[Diorygma microsporum]]'', but it can be distinguished by its secondary chemistry and geographical distribution.<ref name="Lumbsch et al. 2011"/>
==Habitat and distribution== This lichen species has been found in several [[lowland]] rainforest locations in Thailand, including Khao Yai National Park in Nakhon Ratchasima province, [[Saraburi province]], and [[Phu Luang Wildlife Sanctuary]] in [[Loei province]].<ref name="Lumbsch et al. 2011"/> In 2020 it was reported from the [[Cotigao Wildlife Sanctuary]] in [[Goa]], India.<ref name="Gupta et al. 2020"/>
==References== {{Reflist|refs=
<ref name="CoL">{{Catalogue of Life |id=6CX4Q |title=''Diorygma sticticum'' Sutjar., Kalb & Lücking |access-date=12 June 2023}}</ref>
<ref name="Gupta et al. 2020">{{cite journal |last1=Gupta |first1=P. |last2=Randive |first2=P. |last3=Nayaka |first3=S. |last4=Daimari |first4=R. |last5=Joseph |first5=S. |last6=Janarthanam |first6=M.K. |title=New records of graphidoid and thelotremoid lichens from India |journal=Mycotaxon |volume=135 |issue=2 |year=2020 |doi=10.5248/135.345 |pages=345–354 |url=https://www.researchgate.net/publication/342978295}}</ref>
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{{Taxonbar|from=Q16981375}}
[[Category:Diorygma|sticticum]] [[Category:Lichen species]] [[Category:Lichens described in 2011]] [[Category:Lichens of Indo-China]] [[Category:Lichens of India]] [[Category:Taxa named by Klaus Kalb]] [[Category:Taxa named by Robert Lücking]]