{{Short description|Species of lichen}} {{Species box | image = | image_caption = | taxon = Punctelia cedrosensis | authority = Egan & Elix (2004) }}

'''''Punctelia cedrosensis''''' is a species of foliose lichen in the family Parmeliaceae. It is endemic to Mexico, where it grows on the bark of conifers.

==Taxonomy== The lichen was formally described as a new species in 2004 by lichenologists Robert Egan and John Alan Elix.<ref name="Nash et al. 2004"/> The type specimen was collected on Cedros Island (Baja California) at an altitude of {{convert|1100|m|ft|abbr=on}}, where it was growing on ''Juniperus californicus''. Its range was later extended to northern Mexico (Nuevo León and Tamaulipas).<ref name="Egan & Ledemer 2016"/>

==Description== ''Punctelia cedrosensis'' has a blue-grey foliose (leafy) thallus comprising individual flattened lobes that are {{convert|3|–|6|mm|in|abbr=on}} wide. Pseudocyphellae are rare; dense isidia occur on the thallus surface. The thallus undersurface ranges in colour from pale tan to light to medium brown. Rhizines are abundant, evenly distributed, and range in colour from light brown to brownish-black. The conidia are unciform (hook-like), measuring 4–6 by 1&nbsp;μm. The cortex contains atranorin and chloroatranorin, while the medulla contains protoconstipatic, constipatic, dehydroconstipatic, and dehydroprotoconstipatic acids.<ref name="Egan & Ledemer 2016"/>

It is somewhat similar in appearance to the more common North American species ''Punctelia rudecta'', but ''P.&nbsp;cedrosensis'' has much fewer pseudocyphellae, and does not produce lecanoric acid in its medulla.<ref name="Egan & Ledemer 2016"/>

==References== {{Reflist|refs=

<ref name="Egan & Ledemer 2016">{{cite book |last1=Egan |first1=Robert S. |last2=Lendemer |first2=James |year=2016 |chapter=''Punctelia'' in Mexico |editor-last1=Herrera-Campos |editor-first1=Maria |editor-last2=Pérez-Pérez |editor-first2=Rosa Emilia |editor-last3=Nash |editor-first3=Thomas H. III |title=Lichens of Mexico. The Parmeliaceae – Keys, distribution and specimen descriptions |series=Bibliotheca Lichenologica |volume=110 |publisher=J. Cramer |location=Stuttgart |pages=453–480 |isbn=978-3-443-58089-6}}</ref>

<ref name="Nash et al. 2004">{{cite book |last1=Nash |first1=T.H. III |last2=Ryan |first2=B.D. |last3=Diederich |first3=P. |last4=Gries |first4=C. |last5=Bungartz |first5=F. |year=2004 |title=Lichen Flora of the Greater Sonoran Desert Region |volume=2 |page=432 |publisher=Lichens Unlimited, Arizona State University |location=Tempe |isbn=978-0-9716759-1-9}}</ref>

}}

{{Taxonbar|from=Q10646740}}

cedrosensis Category:Lichen species Category:Lichens described in 2004 Category:Lichens of Mexico Category:Taxa named by John Alan Elix Category:Taxa named by Robert Shaw Egan