Astrothelium gyalostiolatum is a species of corticolous (bark-dwelling) crustose lichen in the family Trypetheliaceae.[1] Found in Brazil, it was described in 2022 by the Dutch lichenologist André Aptroot. It belongs to the genus Astrothelium, sharing similarities with Astrothelium bicolor but uniquely characterized by the presence of lichexanthone exclusively around the ostioles.[2]
| Astrothelium gyalostiolatum | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Dothideomycetes |
| Order: | Trypetheliales |
| Family: | Trypetheliaceae |
| Genus: | Astrothelium |
| Species: | A. gyalostiolatum
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| Binomial name | |
| Astrothelium gyalostiolatum Aptroot (2022)
| |
Description
editThe lichen has a dull, dirty ochraceous gray thallus, covering up to 15 cm in diameter. The thallus resembles resin in texture and is bordered by a black prothallus line. It produces ascomata, which are immersed in groups within pseudostromata, and bears hyaline, ascospores with three septa (internal partitions). The unique chemical signature is the UV+ (yellow) reaction of its ostioles, indicating the presence of lichexanthone.[2]
Habitat and distribution
editExclusive to Brazil's Mato Grosso region, A. gyalostiolatum grows on tree bark in primary rainforests.[2]
References
edit- ^ "Astrothelium gyalostiolatum Aptroot". Catalogue of Life. Species 2000: Leiden, the Netherlands. Retrieved 20 February 2024.
- ^ a b c Aptroot, André; de Souza, Maria Fernanda; dos Santos, Lidiane Alves; Junior, Isaias Oliveira; Barbosa, Bruno Micael Cardoso; da Silva, Marcela Eugenia Cáceres (2022). "New species of lichenized fungi from Brazil, with a record report of 492 species in a small area of the Amazon Forest". The Bryologist. 125 (3): 435–467. doi:10.1639/0007-2745-125.3.433.
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