Acanthothecis

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Genus of lichen-forming fungi

title: "Acanthothecis" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["acanthothecis", "lichen-genera", "graphidales-genera", "taxa-named-by-frederic-clements", "taxa-described-in-1909"] description: "Genus of lichen-forming fungi" topic_path: "general/acanthothecis" source: "https://en.wikipedia.org/wiki/Acanthothecis" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Genus of lichen-forming fungi ::

| image = Acanthothecis abaphoides 150671.jpg | image_caption = Acanthothecis abaphoides | taxon = Acanthothecis | authority = Clem. (1909) | type_species = Acanthothecis pachygraphoides | type_species_authority = (Vain.) Clem. (1909) | subdivision_ranks = Species | subdivision = See text

Acanthothecis is a genus of lichen-forming fungi in the family Graphidaceae. The genus was circumscribed by Frederick Edward Clements in 1909. These lichens form pale grey-brown to olive-green crusts on tree bark and are characterized by elongated, pencil-like slits containing spores, with distinctive tiny spines on internal filaments that help distinguish them from similar genera. The genus includes about 50 species found primarily in tropical and subtropical forests worldwide, where they grow on living tree bark and serve as indicators of relatively undisturbed woodland environments.

Description

Acanthothecis forms a pale grey-brown to olive-green crust (thallus) that may lack a skin () or bear a thin one, and often contains scattered crystals that give a slightly texture. Its fruit bodies are —elongated, pencil-like slits—ranging from immersed to sitting on the surface; their lips are usually well developed and can be smooth or faintly striate. The rim that encircles each lirella () is generally colourless rather than the charcoal-black seen in many relatives, and it houses minute filaments ( and paraphyses) whose tips are armed with tiny spines—an unusual diagnostic trait in the family. Inside, the hymenium (spore-bearing layer) does not stain blue in iodine tests (non-amyloid) and is usually clear, while the asci are of the Graphis-type and release two to eight hyaline ascospores that are —divided by thin inner walls that give each compartment a lens-shaped outline—and typically show no iodine reaction (I–).

Secondary metabolites vary between species and may include norstictic, stictic, protocetraric acid or psoromic acids, the yellow pigment lichexanthone, or the anthraquinone isohypocrellin.

Morphologically the genus clusters into three informal groups. A. obscura has a dark brown excipulum and an (grainy) hymenium; the A. hololeucoides group features a grey to pale yellowish thallus with mainly smooth lirellae; and the A. subclavulifera group shows an olive thallus with conspicuously striate lips. The combination of spinulose filaments, predominantly non- rim, and I– spores separates Acanthothecis from superficially similar genera such as Anomalographis, Anomomorpha, Fissurina, Gymnographopsis and Hemithecium, all of which lack one or more of these features.

Ecology

Acanthothecis occurs across the humid to seasonally dry tropics and subtropics worldwide. They are predominantly corticolous, growing on the bark of living trees in primary or only lightly disturbed evergreen forests, where they tolerate both shaded and moderately exposed microhabitats. Because the genus favours intact forest canopies, several species are considered indicators of relatively undisturbed woodland and may decline with intensive logging or land conversion.

Species

::figure[src="https://upload.wikimedia.org/wikipedia/commons/b/ba/Acanthothecis_peplophora_-Flickr-_pellaea.jpg" caption="''Acanthothecis peplophora''"] ::

, Species Fungorum (in the Catalogue of Life) accepts 56 species of Acanthothecis.

References

References

  1. (2023). "New species and records of Graphidaceae and Gomphillaceae (lichenized fungi) from Brazil". Plant and Fungal Systematics.
  2. (2007). "Two new species in the Australian Graphidaceae (lichenized Ascomycotina)". Australasian Lichenology.
  3. (2008). "Three new species in the Australian Graphidaceae (lichenized Ascomycota)". Australasian Lichenology.
  4. (2013). "''Acanthothecis sarcographoides'' (Ascomycota: Graphidaceae), a morphologically unique, new lichen species from the Atlantic Forest in Northeastern Brazil". Acta Botanica Brasilica.
  5. (1909). "The Genera of Fungi".
  6. "''Acanthothecis''".
  7. (2009). "Two new species of ''Acanthothecis'' (lichenized Ascomycota) from Brazil". Mycotaxon.
  8. (2022). "An updated world key to the species of ''Acanthothecis'' s. lat. (Ascomycota: Graphidaceae), with ten new species from Brazil". The Lichenologist.
  9. (2015). "A new species of ''Acanthothecis'' (lichenized Ascomycetes) from India". Journal on New Biological Reports.
  10. (2019). "New lichenized Arthoniales and Ostropales from Mexican seasonally dry tropical forest". The Bryologist.
  11. (2017). "New and interesting species in the family Graphidaceae (Ascomycota: Ostropales) from Vietnam". The Lichenologist.
  12. (2009). "New or otherwise interesting lichens from the tropics, including the lichen genus ''Ramboldia'' in Thailand". Mycotaxon.
  13. (2010). "''Acanthothecis virgulicola'', a new Tasmanian lichen". Herzogia.
  14. (2014). "Seven new species of Graphidaceae (Lichenized Ascomycetes) from the Coastal Plain of southeastern North America". Phytotaxa.
  15. (2008). "Clave y guía ilustrada para géneros de Graphidaceae". GLALIA.
  16. (2003). "A new species of ''Acanthothecis'' from India". Mycotaxon.
  17. (2007). "Trans-septate species of ''Acanthothecis'' and ''Fissurina'' from India". The Lichenologist.
  18. (2016). "A new species of ''Acanthothecis'' (Ostropales), highlights subtropical floristic elements of the southern Appalachian lichen biota in eastern North America". The Bryologist.
  19. (2017). "The lichens of Dagny Johnson Key Largo Hammock Botanical State Park, Key Largo, Florida, USA". Bulletin of the Florida Museum of Natural History.
  20. (2010). "New species and records of the lichen genus ''Acanthothecis'' (Graphidaceae) from India". The Lichenologist.
  21. Sipman, Harrie J.M.. (2014). "New species of Graphidaceae from the Neotropics and Southeast Asia". Phytotaxa.
  22. (1999). "''Acanthothecis'' and other graphidioid lichens with warty periphysoids or paraphysis-tips". Mycotaxon.
  23. (2013). "Sixty-two species of lirelliform Graphidaceae (Ascomycota) new to Panama, with four species newly described to science". Herzogia.

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