Pyxine profallax

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Pyxine profallax
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Caliciales
Family: Caliciaceae
Genus: Pyxine
Species:
P. profallax
Binomial name
Pyxine profallax
Kalb (2009)

Pyxine profallax is a species of corticolous (bark-dwelling), foliose lichen in the family Caliciaceae. [1] It is found in Australia, Papua New Guinea, and Thailand.

Contents

Taxonomy

The lichen was formally described as a new species in 2009 by Klaus Kalb. The species epithet refers to its sorediate lookalike, Pyxine fallax . The type specimen was collected in 1975 by Syo Kurokawa near Woitape (Central Province, Papua New Guinea) at an elevation of about 1,600 m (5,200 ft). [2]

Description

The loosely attached grey, whitish, or brownish-grey thallus of Pyxine profallax reaches a diameter of up to 5 cm (2 in). A mat of shiny black rhizines attach the thallus to its bark substrate . The lobes making up the thallus are up to about 1 mm wide, and divide more or less dichotomously . They have pseudocyphellae on the margins and a reticulate upper surface texture. Neither soredia nor isidia occur in this lichen, but it does have ascomata of the obscurens-type, measuring 0.5–1 mm in diameter, with black discs . The ascospores , which number eight per ascus, have a single septum and measure 16–20 by 6.5–8  μm. [2]

Pyxine profallax contains norstictic acid as a major compound, testacein (submajor), and atranorin as a minor secondary metabolite. Thin-layer chromatography shows that it also contains the same chemical array of terpenes that are found in its namesake, P. fallax. [2]

Habitat and distribution

Originally described from Papua New Guinea, it was recorded from Thailand in 2012, [3] and from Queensland, Australia in 2015. [4]

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References

  1. "Pyxine profallax Kalb". Catalogue of Life . Species 2000: Leiden, the Netherlands. Retrieved 22 December 2023.
  2. 1 2 3 Kalb, Klaus; Archer, Alan W.; Sutjaritturakan, Jutarat; Boonpragob, Kansri (2009). "Further new species of Xanthoparmelia (Parmeliaceae, Ascomycota) from Tasmania". In Aptroot, A.; Seaward, M.R.D.; Sparrius, L.B. (eds.). Biodiversity and Ecology of Lichens – Liber Amicorum Harrie Sipman. Bibliotheca Lichenologica. Vol. 99. Berlin/Stuttgart: J. Cramer. pp. 225–246. ISBN   978-3-443-58078-0.
  3. Mongkolsuk, P.; Meesim, S.; Poengsungnoen, V.; Kalb, K. (2012). "The lichen family Physciaceae in Thailand - I. The genus Pyxine". Phytotaxa. 59: 32–54.
  4. Elix, John A. (2015). "Additional lichen records from Australia. 80" (PDF). Australasian Lichenology. 76: 2–7.