Cresponea

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Cresponea is a genus of lichens in the family Opegraphaceae. The genus, circumscribed in 1993, contains species that were formerly classified in Lecanactis. Cresponea is widely distributed, but most species are found in tropical and subtropical regions.[1] The genus is named in honor of the Spanish lichenologist Ana Crespo.[2]

Description

Cresponea spreads as a thin, paint-like crust that merges with the surface of bark or, less often, rock. The thallus can be smooth or cracked into an irregular mosaic, and on rare occasions it breaks into tiny, discrete Template:Lichengloss. Colours range from chalk-white through pale grey to a muted green; some specimens show a narrow, dark brown margin where the fungal threads alone grow out beyond the Template:Lichengloss. Because there is no separate Template:Lichengloss, the fungal tissue lies directly over the Template:Lichengloss, usually the filamentous green alga genus Trentepohlia, which gives a faint orange tint when the surface is scratched. The lichen never produces isidia or soralia, so it relies on its sexual and asexual fruit bodies for dispersal.[3]

The sexual structures are small, button-like apothecia that sit on the thallus with a pinched base. They lack a rim of thallus tissue, instead showing a glossy, often crenulated rim (the Template:Lichengloss) that is conspicuously dark brown to black and remains free of the powdery bloom that coats many related genera. The Template:Lichengloss starts flat, may become gently domed, and is dusted with a fine white or bluish Template:Lichengloss, especially in young apothecia. Inside, the clear hymenium stains blue or reddish in iodine and houses slender Template:Lichengloss filaments whose club-shaped tips carry a dark brown cap; together these caps form a granular Template:Lichengloss that turns yellow in potassium hydroxide solution. Each ascus releases eight long, spindle-shaped ascospores divided by three to nineteen cross-walls (septa); the walls are thick, and the spores stay colourless. Asexual reproduction occurs in tiny pycnidia embedded in the crust; these produce short, rod-shaped conidia. Most species show no detectable lichen products in chemical tests.[3]

Ecology

Generally epiphytic, Cresponea lichen prefer mature, humid woodlands and are sometimes used as an indicator of old-growth conditions, though a few species tolerate rock surfaces in sheltered sites.[3]

Species

As of June 2025Script error: No such module "Check for unknown parameters"., Species Fungorum (in the Catalogue of Life) accepts 23 species of Cresponea.[4]

  • Cresponea ancistrosporelloides Sparrius & Sipman (2011)Script error: No such module "Check for unknown parameters".
  • Cresponea apiculata Egea, Sérus. & Torrente (1996)Script error: No such module "Check for unknown parameters".
  • Cresponea chloroconia (Tuck.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea endosulphurea M.Cáceres, A.A.Menezes & Aptroot (2013)Script error: No such module "Check for unknown parameters".[5] – Brazil
  • Cresponea flava (Vain.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea flavescens (Vain.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea flavosorediata Aptroot & M.Cáceres (2014)Script error: No such module "Check for unknown parameters".[6] – Brazil
  • Cresponea follmannii (C.W.Dodge) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea graemeannae Kantvilas (2020)Script error: No such module "Check for unknown parameters".[7]
  • Cresponea japonica A.Sakata & H.Harada (2009)Script error: No such module "Check for unknown parameters".
  • Cresponea leprieurii (Mont.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea leprieuroides (Nyl.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea lichenicola Aptroot & M.Cáceres (2014)Script error: No such module "Check for unknown parameters".[6] – Brazil
  • Cresponea litoralis Elix (2007)Script error: No such module "Check for unknown parameters".[8] – Australia
  • Cresponea macrocarpoides (Zahlbr.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea melanocheiloides (Vain.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea pallidosorediata Aptroot (2022)Script error: No such module "Check for unknown parameters".[9] – Brazil
  • Cresponea plurilocularis (Nyl.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea premnea (Ach.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea proximata (Nyl.) Egea & Torrente (1993)Script error: No such module "Check for unknown parameters".
  • Cresponea quinqueseptata Aptroot & M.Cáceres (2021)Script error: No such module "Check for unknown parameters".[10] – Brazil
  • Cresponea sorediata Elix, Øvstedal & N.J.M.Gremmen (2011)Script error: No such module "Check for unknown parameters".
  • Cresponea subpremnea (Kantvilas & Vězda) Kantvilas (2020)Script error: No such module "Check for unknown parameters".[7]

References

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  1. ↑ Script error: No such module "Citation/CS1".
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  4. ↑ Template:Catalogue of Life
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".

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