Astrothelium guianense is a species of corticolous (bark-dwelling) lichen in the family Trypetheliaceae.[1] Found in Guyana, it was formally described as a new species in 2016 by Dutch lichenologist André Aptroot. The type specimen was collected Harrie Sipman and the author from the Pacaraima Mountains (Cuyuni-Mazaruni region), where it was found in a rainforest growing on smooth tree bark. The lichen has a discontinuous, olive-green thallus with a cortex but lacking a prothallus, which covers areas of up to 6 cm (2.4 in) in diameter. The presence of the lichen induces the formation of galls in its host, which tends to split and deform under the thallus. No lichen products were detected in the collected specimens using thin-layer chromatography.[2] The main characteristics of the lichen distinguishing it from others in Astrothelium are its gall-like thallus that has a bullate or folded texture; its solitary ascomata, which are immersed in the thallus and have only an area around the ostiole that is visible; and ascospores (numbering four per ascus) that lack a thick median septum.[3]
| Astrothelium guianense | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Dothideomycetes |
| Order: | Trypetheliales |
| Family: | Trypetheliaceae |
| Genus: | Astrothelium |
| Species: | A. guianense
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| Binomial name | |
| Astrothelium guianense Aptroot (2016)
| |
References
edit- ^ "Astrothelium guianense Aptroot". Catalogue of Life. Species 2000: Leiden, the Netherlands. Retrieved 30 October 2022.
- ^ Aptroot, André; Ertz, Damien; Etayo Salazar, Javier Angel; Gueidan, Cécile; Mercado Diaz, Joel Alejandro; Schumm, Felix; Weerakoon, Gothamie (2016). "Forty-six new species of Trypetheliaceae from the tropics". The Lichenologist. 48 (6): 609–638. doi:10.1017/s002428291600013x. S2CID 89128070.
- ^ Aptroot, André; Lücking, Robert (2016). "A revisionary synopsis of the Trypetheliaceae (Ascomycota: Trypetheliales)". The Lichenologist. 48 (6): 763–982. doi:10.1017/s0024282916000487. S2CID 89119724.
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