Glaucotrema

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Glaucotrema
Graphidaceae (10.3897-mycokeys.17.10512) Figure 3A.jpg
Morphology and anatomy of Glaucotrema thailandicumA–B habit of ascoma, C cross-section of ascoma showing whitish and reticulate columella , D asci with spores , and E submuriform ascospores (holotype).
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Graphidales
Family: Graphidaceae
Genus: Glaucotrema
Rivas Plata & Lumbsch (2012)
Type species
Glaucotrema glaucophaenum
(Kremp.) Rivas Plata & Lumbsch (2012)

Glaucotrema is a genus of lichen-forming fungi in the family Graphidaceae. It has five species. [1]

Taxonomy

The genus was circumscribed in 2012 by the lichenologists Eimy Rivas Plata and Helge Thorsten Lumbsch, with Glaucotrema glaucophaenum assigned as the type species. This lichen was originally described as a species of Thelotrema by August von Krempelhuber in 1875, [2] and was later classified in the genus Myriotrema . The genus name merges the suffix -trema with a portion of the epithet from its type species, glaucophaenum. [3]

Originally, Glaucotrema was proposed to contain the type and one other species, G. costaricense . Three additional newly described species were added to the genus in 2014–2016, from collections made in Brazil and Thailand. [4] [5] [6]

Description

The thallus of Glaucotrema is characterised by a pale green-grey to pale olive-green colour, with a surface that can range from smooth to slightly uneven. It features a densely packed outer layer ( cortex ) composed of tightly interwoven fungal cells ( prosoplectenchymatous structure). Within this structure lies a layer of algae cells (the photobiont ), interspersed with clusters of calcium oxalate crystals. [3]

The reproductive structures of Glaucotrema, known as apothecia, are typically rounded to angular and can be either slightly emerging from the thallus or prominently displayed. The discs of these structures range in colour from flesh-colured to pale brown and are thinly covered with a white, powdery coating ( pruinose ). The edges of these discs are usually smooth, though they can occasionally be fissured. While a true central support column ( columella ) is absent, a pseudo-column ( pseudocolumella ) often appears, consisting of tissue strands that originate from the side of the cup-like structure (lateral excipulum ). The excipulum (the tissue surrounding the reproductive disc) also has a tightly interwoven cellular structure ( prosoplectenchymatous ) and is typically colourless. It may either remain attached or become partially detached and perforated ( fenestrate ). There are no hair-like structures ( periphysoids ) around the edges of the disc. The spore-producing filaments (paraphyses) within the apothecia are simple and unbranched. [3]

Spores produced by Glaucotrema are typically eight per sac (ascus), ellipsoid in shape, and divided into four parts by three cross-walls (3-septate), with thick dividers and lens-shaped internal spaces ( lumina ). These spores are colourless and turn violet-blue when stained with iodine (I+ violet-blue). [3] Glaucotrema thailandicum is unique in the genus in having submuriform ascospores. [6] Chemically, Glaucotrema contains psoromic acid, which reacts yellow when tested with paraphenylenediamine (P+ yellow), indicating its presence. [3]

Species

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Compositrema is a genus of lichen-forming fungi in the family Graphidaceae. It has four species. The genus was circumscribed in 2012 by lichenologists Eimy Rivas Plata, Robert Lücking, and Helge Thorsten Lumbsch, with C. cerebriforme assigned as the type species. The genus is distinguished by its unique, composite pseudostromatic ascomata, which sets it apart from the otherwise similar genus Stegobolus.

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Nitidochapsa is a genus of lichen-forming fungi in the family Graphidaceae. It has five species of corticolous (bark-dwelling), crustose lichens.

Pycnotrema is a small genus of lichen-forming fungi in the family Graphidaceae. Its two species are characterised by their small, rounded apothecial pores.

References

  1. ↑ "Glaucotrema". Catalogue of Life . Species 2000: Leiden, the Netherlands. Retrieved 27 April 2024.
  2. ↑ Krempelhuber, A. von (1875). "Lichenes quos legit O. Beccari in insulis Borneo et Singapore annis 1866 et 1867". Nuovo Giornale Botanico Italiano (in Latin). 7 (1): 5–67 [19].
  3. 1 2 3 4 5 Rivas Plata, E.; Lücking, R.; Lumbsch, H.T. (2012). "Molecular phylogeny and systematics of the Ocellularia clade (Ascomycota: Ostropales: Graphidaceae)". Taxon. 61 (6): 1161–1179. doi:10.1002/TAX.616001.
  4. 1 2 Lücking, R. (2015). "Thelotremoid Graphidaceae from the NYBG herbarium: New species, range extensions, and a forgotten lichen". Opuscula Philolichenum. 14: 1–57 [5].
  5. 1 2 Cáceres, Marcela; Aptroot, André; Parnmen, Sittiporn; Lücking, Robert (2014). "Remarkable diversity of the lichen family Graphidaceae in the Amazon rain forest of Rondônia, Brazil". Phytotaxa. 189 (1): 87–136. doi:10.11646/phytotaxa.189.1.8.
  6. 1 2 3 Naksuwankul, Khwanyuruan; Kraichak, Ekaphan; Parnmen, Sittiporn; Lücking, Robert; Lumbsch, H. Thorsten (2016). "Five new species of Graphidaceae (Ascomycota, Ostropales) from Thailand". MycoKeys. 17: 47–63. doi: 10.3897/mycokeys.17.10512 .
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