Astrothelium globosum

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Astrothelium globosum
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Dothideomycetes
Order: Trypetheliales
Family: Trypetheliaceae
Genus: Astrothelium
Species:
A. globosum
Binomial name
Astrothelium globosum
Aptroot & M.Cáceres (2016)

Astrothelium globosum is a species of lichen in the family Trypetheliaceae. [1] This species is characterised by its immersed ascomata (fruiting bodies) and a thallus consisting of nearly spherical warts, along with distinctive 3-septate ascospores. [2]

Contents

Taxonomy

Astrothelium globosum was formally described as a new species in the journal The Lichenologist in 2016. The type specimen was collected in Santa Luzia do Itanhi  [ pt ], Mata do Crasto, Brazil, on the bark of a tree, in March 2012. [2]

Description

The thallus of Astrothelium globosum is corticate , consisting of closely appressed, nearly spherical warts measuring 0.3–0.9 mm in diameter. These warts form a pale greyish-green cover over areas up to 3 cm in diameter and are approximately 0.9 mm thick. The thallus has a thick hyaline cortex and does not induce gall formation on the host bark. Ascomata are pyriform, measuring 0.2–0.4 mm in diameter, and usually appear in groups of 2–5, immersed in the bark and visible from above by black ostioles between the thallus warts. The ascomata wall is carbonised and up to 50  μm thick. Ostioles are eccentric and brown. The hamathecium is not inspersed, and ascospores are 8 per ascus, hyaline, 3-septate, long ellipsoid, 35–40 by 11–13 μm, with diamond-shaped lumina and surrounded by a gelatinous sheath. Pycnidia were not observed in this species. [2]

This species is distinguished by a unique thallus consisting of almost spherical warts, an unusual three-dimensional feature for a crustose lichen. It is most closely related to Astrothelium simplex , which is differentiated by its longer ascospores. [2]

Chemistry

The thallus surface of Astrothelium globosum is UV−, and the thallus medulla is K−. Thin-layer chromatography, a technique used to identify chemical substances, tests revealed no secondary substances. [2]

Ecology and distribution

Astrothelium globosum is found on the smooth bark of trees in lowland Atlantic rainforest. At the time of its original publication, it was known to occur only in Brazil. [2]

Related Research Articles

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Astrothelium ochroleucoides is a species of corticolous (bark-dwelling) lichen in the family Trypetheliaceae. It is found in Brazil and Guyana.

Astrothelium solitarium is a species of corticolous (bark-dwelling) in the family Trypetheliaceae. Found in Brazil, it was formally described as a new species in 2016 by lichenologists André Aptroot and Marcela Cáceres. The species is closely related to Astrothelium ceratinum but differs in its ascospore size.

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Astrothelium trematum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae, first described in 2018. Found only in Brazil, it is characterised by its lack of lichexanthone and pigments, and distinctive ascospores.

Astrothelium tetrasporum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae, first described in 2016. It is found in Brazil.

Astrothelium simplex is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae, first described in 2016. It is found in the Atlantic Forest of Brazil.

Astrothelium rubrocrystallinum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae, first described in 2016. It is found in Brazil.

Astrothelium megeustomum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae, first scientifically described in 2016. It is found in Brazil.

Astrothelium macrostomum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae. It is found in Brazil, Guyana, and Venezuela.

Astrothelium longisporum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae. It occurs in the Atlantic Forest of Brazil.

Astrothelium graphicum is a species of lichen in the family Trypetheliaceae. This lichen features an extended, reticulate pseudostroma that is lower than its slightly bullate thallus.

Astrothelium curvatum is a species of corticolous lichen in the family Trypetheliaceae. Found in Brazil, it was described as a new species in 2016. It is characterised by its immersed pyriform ascomata with lateral ostioles and bent, muriform ascospores.

References

  1. ↑ "Astrothelium globosum Aptroot & M. Cáceres". Catalogue of Life . Species 2000: Leiden, the Netherlands. Retrieved 22 December 2023.
  2. 1 2 3 4 5 6 Aptroot, André; Mendonça, Cléverton de Oliveira; Andrade, Danyelly Santos; Silva, Jeanne dos Reis; Martins, Suzana Maria de Azevedo; Gumboski, Emerson; Fraga, Carlos Augusto Vidigal; Cáceres, Marcela Eugenia da Silva (2016). "New Trypetheliaceae from northern and southern Atlantic rainforests in Brazil". The Lichenologist. 48 (6): 713–725. doi: 10.1017/s0024282916000037 .
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