Biology:Asteroporum

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Asteroporum is a little-known genus of putatively lichen-forming fungi of uncertain familial and ordinal placement in the Dothideomycetes. It comprises six species.

Taxonomy

The genus was circumscribed in 1884 by Johannes Müller Argoviensis. The original description was based on a single known example collected from Palestine, A. perminimum, the type species. The genus name refers to the star-shaped opening of its fruiting bodies (apothecia). A. perminimum, grows in an extremely reduced form with no visible thallus (fungal body) on the rock surface except where the reproductive structures appear.[1]

The type species A. perminimum was found growing on small calcareous rocks near Petiville. Its fruit bodies are round to slightly oval, somewhat flattened with a slightly depressed centre, and have a distinct black rim. The spores measure 12–17 micrometres long by 7–8 micrometres wide, with a slight pinching in the middle, and the upper part of each spore is slightly wider than the lower part.[1]

In 1926, Alexander Zahlbruckner transferred some species to the genus that had originally been described in the genus Astrotrema.[2]

The genus has been little used since its original proposal.[3] Reflecting the uncertainty of its taxonomic relationships, it has been variously classified as incertae sedis (uncertain placement) in the order Pyrenulales,[4] the Arthoniales,[5] the subdivision Pezizomycotina,[6] and the division Ascomycota.[7] In The 2024 Outline of Fungi and fungus-like taxa, it is listed as being of uncertain placement in the Dothideomycetes.[8] Robert Lücking and colleagues noted in 2017: "Whether the type species is actually lichenized is questionable; the genus is certainly heterogeneous".[9]

Description

Key distinguishing features of genus Asteroporum include:[1]

  • tiny fruit bodies (perithecia) measuring just 0.1 mm wide
  • distinctive star-shaped opening that splits into 3–4 lobes
  • hyaline (translucent) spores that are divided by cross-walls (septa)
  • simple, sparse internal threads (paraphyses)
  • structure similar to Mycoporum but with fewer spore-producing chambers

Species

  • Asteroporum deformatum Zahlbr. (1928)[10]
  • Asteroporum minimum Müll.Arg. (1884)
  • Asteroporum orbiculinum (Müll.Arg.) Zahlbr. (1926)[2]
  • Asteroporum parasiticum (Müll.Arg.) Zahlbr. (1926)[2]
  • Asteroporum perminimum Müll.Arg. (1884)
  • Asteroporum punctuliforme (Müll.Arg.) Zahlbr. (1926)[2]

The taxon Asteroporum rimale Müll.Arg. (1895) was determined to be a synonym of Arthonia banksiae.[3]

See also

  • List of Dothideomycetes taxa incertae sedis

References

  1. ↑ 1.0 1.1 1.2 Müller, J. (1884). "Lichens de Palestine" (in la). Revue Mycologique Toulouse 6 (21): 12–15. https://bibdigital.rjb.csic.es/viewer/11195/?offset=#page=16&viewer=picture&o=bookmark&n=0&q=. 
  2. ↑ 2.0 2.1 2.2 2.3 Zahlbrucker, A. (1928). "Lichenes. B. Spezieller Teil" (in de). Die natürlichen Pflanzenfamilien. 8 (2nd ed.). Leipzig: W. Engelmann. pp. 61–270. 
  3. ↑ 3.0 3.1 Kantvilas, Gintaras; Stajsic, Val (2011). "Arthonia banksiae (lichenised Ascomycota) and its synonyms". Meulleria 29 (1): 27–32. 
  4. ↑ Lumbsch, H. Thorsten; Huhndorf, Sabine M. (2010). "Myconet Volume 14. Part One. Outline of Ascomycota—2009. Part Two. Notes on Ascomycete Systematics. Nos. 4751–5113". Fieldiana Life and Earth Sciences 1: 1–64 [12]. doi:10.3158/1557.1. 
  5. ↑ Jaklitsch, Walter; Baral, Hans-Otto; Lücking, Robert; Lumbsch, H. Thorsten (2016). Syllabus of Plant Families: Adolf Engler's Syllabus der Pflanzenfamilien. 1/2 (13 ed.). Berlin Stuttgart: Gebr. Borntraeger Verlagsbuchhandlung, Borntraeger Science Publishers. p. 45. ISBN 978-3-443-01089-8. OCLC 429208213. 
  6. ↑ Lücking, Robert; Hodkinson, Brendan P.; Leavitt, Steven D. (2017). "The 2016 classification of lichenized fungi in the Ascomycota and Basidiomycota–Approaching one thousand genera". The Bryologist 119 (4): 361–416 [399]. doi:10.1639/0007-2745-119.4.361. 
  7. ↑ "Asteroporum". Species 2000: Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/62DPX. 
  8. ↑ Hyde, K.D.; Noorabadi, M.T.; Thiyagaraja, V.; He, M.Q.; Johnston, P.R.; Wijesinghe, S.N. et al. (2024). "The 2024 Outline of Fungi and fungus-like taxa". Mycosphere 15 (1): 5146–6239 [5232]. doi:10.5943/mycosphere/15/1/25. https://www.researchgate.net/publication/385939154. 
  9. ↑ Lücking, Robert; Hodkinson, Brendan P.; Leavitt, Steven D. (2017). "Corrections and amendments to the 2016 classification of lichenized fungi in the Ascomycota and Basidiomycota". The Bryologist 120 (1): 58–69 [60]. doi:10.1639/0007-2745-120.1.058. 
  10. ↑ Zahlbrucker, A. (1928). "Neue und ungenügend beschriebene javanische Flechten". Annales de Cryptogamie Exotique 1: 116. 
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Wikidata ☰ Q107289624 entry



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