View source for Biology:Polymeridium multiseptatum

{{Short description|Species of lichen}}
{{Speciesbox
| image =
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| taxon = Polymeridium multiseptatum
| authority = Aptroot, A.A.Menezes & M.Cáceres (2013)
}}

'''''Polymeridium multiseptatum''''' is a species of corticolous (bark-dwelling) [[Biology:Lichen|lichen]] in the family [[Biology:Trypetheliaceae|Trypetheliaceae]].<ref name="CoL"/> Found in Brazil, it was [[Biology:Species description|described]] by lichenologists André Aptroot, Aline Anjos Menezes, and Marcela Cáceres in 2013. The thallus of ''P.&nbsp;multiseptatum'' is {{lichengloss|ecorticate}} and whitish-grey in color, with the distinctive feature of [[Biology:Fluorescence|fluorescing]] yellow under ultraviolet light. This lichen closely resembles ''Polymeridium quinqueseptatum'', with the primary distinguishing characteristic being the [[Chemistry:Spot test (lichen)#Tests|UV+]] (yellow) thallus. The ascomata are 0.2–0.4&nbsp;mm in diameter, featuring a solitary, spherical {{lichengloss|centrum}} that is {{lichengloss|erumpent}}. The [[Biology:Ostiole|ostiole]] is apical, and the {{lichengloss|hamathecium}} is interspersed with oil droplets, with filaments profusely [[Biology:Anastomosis|anastomosing]]. There are eight {{lichengloss|ascospores}} per [[Biology:Ascus|ascus]], which are [[Chemistry:Iodine|iodine]]-negative, 4–7-[[Biology:Septum|septate]], and measure 18–28 by 5–7&nbsp;[[Micrometre|μm]]. The ascospores are not ornamented, and the wall is not thickened. The lichen's chemistry reveals the presence of [[Chemistry:Lichexanthone|lichexanthone]]. The [[Biology:Type|type specimens]] were collected in Chapada do Araripe, Ceará, at an altitude of {{convert|800|m|ft|abbr=on}}, where it was found growing on tree bark.<ref name="Aptroot & Cáceres 2014"/>

==References==
{{Reflist|refs=

<ref name="CoL">{{Catalogue of Life |id=4LB77 |title=''Polymeridium multiseptatum'' Aptroot, A.A. Menezes & M. Cáceres |access-date=30 March 2023}}</ref>

<ref name="Aptroot & Cáceres 2014">{{cite journal |last1=Aptroot |first1=A. |last2=Cáceres |first2=M.E.S. |year=2014 |title=A refined species concept in the tropical microlichen genus ''Polymeridium'' (Trypetheliaceae) doubles the number of known species, with a world key to species |journal=Nova Hedwigia |volume=98 |pages=1–29 |url=https://www.researchgate.net/publication/272137754}}</ref>

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[[Category:Lichen species]]



{{Sourceattribution|Polymeridium multiseptatum}}