Biology:Astrothelium trematum
| Astrothelium trematum | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Dothideomycetes |
| Order: | Trypetheliales |
| Family: | Trypetheliaceae |
| Genus: | Astrothelium |
| Species: | A. trematum
|
| Binomial name | |
| Astrothelium trematum Kalb & Aptroot (2018)
| |
Astrothelium trematum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae,[1] first described in 2018. Found only in Brazil, it is characterised by its lack of lichexanthone and pigments, and distinctive [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]].
Taxonomy
Astrothelium trematum was formally described by lichenologists Klaus Kalb and André Aptroot in 2018. The type specimen was collected near Caraguatatuba, São Paulo, Brazil, in a plantation of Theobroma cacao. The specimen was collected by the first author on 9 March 1980. The specific epithet trematum refers to the distinct ring around the ostiole that separates the ostiole from the thallus.[2]
Description
The thallus of Astrothelium trematum is dull, up to 0.3 mm thick, and pale olivaceous green, with a thick [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] containing hyaline crystals. It is not surrounded by a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. Ascomata are spherical to [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], 0.6–0.9 mm in diameter, solitary in [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] warts. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is low hemispherical, almost completely covered by a thallus layer, about 1–1.5 mm in diameter, and without pigmentation. Ostioles are apical, consisting of exposed [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], black ascoma wall, about 0.2 mm wide, surrounded by a whitish ring of approximately 0.3 mm in diameter. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is not [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] number eight per ascus, and are hyaline with 5 to 7 septa, measuring 95–135 by 25–33 μm. They have a long ellipsoid shape with internal diamond-shaped [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] were not observed.[2]
The thallus of Astrothelium trematum is UV−, C−, K−, KC−, and P−. Thin-layer chromatography analysis did not detect any secondary metabolites.[2]
Habitat and distribution
Astrothelium trematum was found on tree bark in a cocoa plantation, and at the time of its original publication, was known only to occur in Brazil.[2]
References
- ↑ "Astrothelium trematum Kalb & Aptroot". Species 2000: Naturalis, Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/J5KL.
- ↑ 2.0 2.1 2.2 2.3 Kalb, K.; Aptroot, A. (2018). "New lichen species from Brazil and Venezuela". The Bryologist 121 (1): 56–66. doi:10.1639/0007-2745-121.1.056.
Wikidata ☰ Q107504104 entry
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