Bathelium carolinianum

The lichen was first formally described as a new species in 1858 by American lichenologist Edward Tuckerman. His {{lichengloss|diagnosis}} of the new species was as follows (translated from Latin): "Trypethelium carolinianum, new species, with a crustaceous, smooth, and wax-like thallus turning from green to brownish, with warts that are depressed to somewhat hemispherical, confluent, of irregular shape, and somewhat anastomosing, turning deep brown to blackish, with a yellow stroma, perithecia that are ovoid, thin, and black, and ostioles that are papillate and black." The species epithet carolinianum refers to the type locality, in Santee Canal, South Carolina, where Henry William Ravenel found it growing on tree trunks in 1851. Richard Harris transferred the species to the genus Bathelium in 1995.

Bathelium carolinianum features a greenish-brown thallus. Its dark brown {{lichengloss|perithecia}} cluster in {{lichengloss|pseudostroma}}, which is rich in yellow pigment. This lichen commonly thrives on smooth-barked hardwoods, notably the American holly. It does not react with any of the standard chemical spot tests.

Trypethelium virens is somewhat similar in appearance, but its pseudostromata are the same color as the thallus, and its pseudostroma does not have yellow pigment.

One of the main characteristics of the lichen Bacidia thiersiana, widespread throughout southeastern North America and described as new to science in 2020, is its frequent occurrence on and near the thalli of Bathelium carolinianum. Etayoa trypethelii is a lichenicolous fungus that has been documented to infect Bathelium carolinianum; it does not visibly damage the thallus of its host.

{{Reflist|colwidth=30em|refs=

{{Catalogue of Life |id=KW9J |title=Bathelium carolinianum (Tuck.) R.C. Harris |access-date=October 23, 2023}}

{{cite journal |last1=Ertz |first1=Damien |last2=Lawrey |first2=James D. |last3=Common |first3=Ralph S. |last4=Diederich |first4=Paul |title=Molecular data resolve a new order of Arthoniomycetes sister to the primarily lichenized Arthoniales and composed of black yeasts, lichenicolous and rock-inhabiting species |journal=Fungal Diversity |volume=66 |issue=1 |year=2013 |doi=10.1007/s13225-013-0250-9 |pages=113–137}}

{{cite book |last1=Harris |first1=Richard C. |year=1995|title=More Florida Lichens, Including the 10-cent Tour of the Pyrenolichens |publisher=New York Botanical Garden |location=Bronx, New York |url=https://nhm2.uio.no/botanisk/lav/RLL/PDF1/R7816.pdf |page=110}}

{{cite journal |last1=Lendemer |first1=James C. |title=Bacidia thiersiana (Ramalinaceae), a new species with lobaric acid widespread in southeastern North America |journal=The Bryologist |volume=123 |issue=1 |year=2020 |doi=10.1639/0007-2745-123.1.039 |pages=39–47}}

{{cite book |last1=Tripp |first1=Erin A. |last2=Lendemer |first2=James C. |year=2020 |title=Field Guide to the Lichens of Great Smoky Mountains National Park |page=86 |publisher=The University of Tennessee Press |location=Knoxville |isbn=978-1-62190-514-1}}

{{cite journal |last1=Tuckerman |first1=E. |year=1858 |title=Supplement to an Enumeration of North American Lichenes |journal=American Journal of Science and Arts |volume=25 |series=2 |pages=422–430 [429] |url=https://www.biodiversitylibrary.org/page/27560454}}

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Category:Trypetheliaceae

Category:Lichen species

Category:Lichens described in 1858

Category:Lichens of the United States

Category:Taxa named by Edward Tuckerman