Английская Википедия:Astrothelium testudineum

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

Taxonomy

The lichen was fornally described as a new species in 2016 by lichenologists André Aptroot and Marcela Cáceres. Astrothelium testudineum is most similar to A. leioplacum, but it can be distinguished by its Шаблон:Lichengloss Шаблон:Lichengloss and larger Шаблон:Lichengloss.

Description

The thallus of Astrothelium testudineum is thickly Шаблон:Lichengloss, smooth, somewhat shiny, continuous, and ochraceous, covering areas up to Шаблон:Lichengloss in diameter. It is approximately 0.2 mm thick and surrounded by a black prothallus line, about 0.1 mm wide. The lichen does not induce gall formation on the host bark.

Ascomata are Шаблон:Lichengloss, measuring 0.5–0.9 mm in diameter, and are mostly aggregated in groups of 2–6, immersed in the thallus, without Шаблон:Lichengloss. The wall is Шаблон:Lichengloss all around, up to about 70 μm thick. Ostioles are eccentric, fused, and flat, with a brown colour. Шаблон:Lichengloss is densely inspersed with hyaline oil globules. Asci contain 8 ascospores, which are hyaline, densely Шаблон:Lichengloss, broadly ellipsoid, and measure 50–65 by 23–27 μm.

In terms of standard chemical spot tests, the thallus surface of Astrothelium testudineum is UV−, and the thallus medulla is K−. Thin-layer chromatography shows no secondary substances detected.

Habitat and distribution

Astrothelium testudineum is found on Hevea brasiliensis bark in plantations. The species is currently known only from Brazil.