{{Short description|Species of lichen}} {{Use mdy dates|date=February 2021}} {{Use American English|date=February 2021}} {{Species box | image = | taxon = Punctelia nashii | authority = Marcelli & Canêz (2011) }}
'''''Punctelia nashii''''' is a species of foliose lichen in the family Parmeliaceae.<ref name="CoL_4QHNK"/> It is known only from California.
==Taxonomy==
The lichen was described as a new species in 2011 by the Brazilian lichenologists Marcelo Marcelli and Luciana da Silva Canêz. The type specimen was collected from the Hastings Natural History Reservation in Monterey County, a biological field station of the University of California. Here it was found growing on blue oak (''Quercus douglasii'') at an elevation of {{convert|560|m|ft|abbr=on}}. The specific epithet ''nashii'' honors Thomas Hawkes Nash III, "in recognition of his support and for collecting the holotype".<ref name="Marcelli et al. 2011"/>
==Description==
The lichen has a greenish-colored thallus about {{convert|10|by|14|cm|in|abbr=on}}, comprising irregularly branched lobes measuring {{convert|2.5|by|4.0|cm|in|abbr=on|1}} wide. Soralia on the thallus surface are whitish, with granula soredia. This species does not produce isidia. The pseudocyphellae (one of the uniting features of the genus ''Punctelia'') are few, and described as "inconspicuous". The undersurface of the thallus ranges from white to yellowish-brown. There are rhizines, both twisted short ones, and longer, sparser ones; both are brown, and always darker than the undersurface. Apothecia are absent.<ref name="Marcelli et al. 2011"/>
The main secondary compounds in ''Punctelia nashii'' are atranorin and lecanoric acid. The lichen spot tests that give positive reactions in the upper cortex are K+ (yellow), and in the medulla C+ (rose), and KC+ (rose).<ref name="Marcelli et al. 2011"/>
==References== {{Reflist|refs=
<ref name="CoL_4QHNK">{{Catalogue of Life |id=4QHNK |title=''Punctelia nashii'' Marcelli & Canêz |access-date=4 June 2025}}</ref>
<ref name="Marcelli et al. 2011">{{cite journal |last1=Marcelli |first1=M.P. |last2=Canêz |first2=L.S. |last3=Benatti |first3=M.N. |last4=Spielmann |first4=A.A. |last5=Jungbluth |first5=P. |author-link6=John Alan Elix |last6=Elix |first6=J.A. |year=2011 |title=Taxonomical novelties in Parmeliaceae |journal=Bibliotheca Lichenologica |volume=106 |pages=211–224 |url=https://www.researchgate.net/publication/235224715}}</ref>
}}
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nashii Category:Lichen species Category:Lichens of the United States Category:Lichens described in 2011 Category:Fungi without expected TNC conservation status