Английская Википедия:Astrothelium macrostomum
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Astrothelium macrostomum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae.[1] It is found in Brazil, Guyana, and Venezuela.
Taxonomy
The species was formally described as new to science in 2016 by the Dutch lichenologist André Aptroot. The type collection was made by Harrie Sipman in Шаблон:Ill, Minas Gerais, Brazil, on 16 September 1997.
Description
The thallus of Astrothelium macrostomum is Шаблон:Lichengloss, smooth, somewhat shiny, and continuous, covering areas up to 7 cm in diameter and less than 0.1 mm thick. It appears olive-green to olive-grey, typically lacking a Шаблон:Lichengloss, and induces gall formation on the host bark, causing the lower bark or cambium layer to swell and erupt through the upper bark.[2]
Ascomata are Шаблон:Lichengloss (pear-chaped), about 0.6–1.2 mm in diameter, usually aggregated in groups of 2–5, and mostly immersed in the bark tissue. The wall is Шаблон:Lichengloss, up to approximately 80 μm thick. Ostioles are eccentric and fused, with a flat, white-Шаблон:Lichengloss appearance, surrounded by a whitish zone. The Шаблон:Lichengloss does not contain oil lobules. Asci each contain eight Шаблон:Lichengloss. These ascospores are hyaline, 5–7-septate, Шаблон:Lichengloss, measuring 65–85 by 16–19 μm, with pointed ends and diamond-shaped Шаблон:Lichengloss, not surrounded by a gelatinous layer. Шаблон:Lichengloss were not observed to occur in this species.[2]
Chemistry
The thallus surface of Astrothelium macrostomum is UV−, while the medulla is K−. The ostiolar region has a UV+ (yellow) reaction. Thin-layer chromatography indicates the presence of lichexanthone, a xanthone compound that fluoresces when lit with a long-wavelength UV light.[2]
Similar species
Astrothelium macrostomum is similar to Astrothelium eustomum, but can be differentiated by its 5–7-septate Шаблон:Lichengloss, as opposed to the 3–5-septate and smaller ascospores of A. eustomum. Astrothelium diplocarpoides shares some similar characteristics, but differs in having an inspersed Шаблон:Lichengloss and the presence of lichexanthone throughout the thallus.[2]
Habitat and distribution
Astrothelium macrostomum grows on the smooth bark of trees within rainforests. It is known to occur in Brazil, Guyana, and Venezuela.[2]
References
- Английская Википедия
- Astrothelium
- Lichen species
- Lichens described in 2016
- Lichens of Brazil
- Lichens of Guyana
- Lichens of Venezuela
- Taxa named by André Aptroot
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