Biology:Allographa hypostictica
| Allographa hypostictica | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Graphidales |
| Family: | Graphidaceae |
| Genus: | Allographa |
| Species: | A. hypostictica
|
| Binomial name | |
| Allographa hypostictica Kalb & Aptroot (2018)
| |
Allographa hypostictica is a species of saxicolous (rock-dwelling), crustose lichen in the family Graphidaceae,[1] Found in Brazil, it was described as a new species in 2018. Its thallus contains hypostictic acid and its distinctive apothecia and [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]].[2]
Taxonomy
Allographa hypostictica was formally described by the lichenologists Klaus Kalb and Andre Aptroot in 2018. The type specimen was collected in the Serra do Espinhaço, specifically Serra do Caraça, Minas Gerais, Brazil, on a sandstone boulder in an open cerrado at an elavation of 1,450 m (4,760 ft). The specific epithet hypostictica refers to the presence of the chemical compound hypostictic acid, a rare lichen product in the genus Allographa.[2]
Description
The thallus of Allographa hypostictica is saxicolous, crustose, [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] to [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], uneven, not corticate, dull, and ochraceous white, dissected by black [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] lines, and up to 0.2 mm thick. It is surrounded by a black [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] that also extends under much of the thallus as a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. Ascomata are sessile, completely [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], with striate labia, circular in outline with straight linear or sparingly branched split-like [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], measuring 0.5–1.3 mm in diameter and about 0.2–0.4 mm high. The rim is black, and the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is lateral and ochraceous white. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is approximately 200 μm high and not [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. Ascospores are single per ascus, hyaline but soon becoming pale brown, ellipsoid, densely [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], approximately 50 by 8-septate, measuring 115–145 by 28–37 μm, constricted at several major septa, and surrounded by a gelatinous sheath about 3 μm thick. Pycnidia were not observed to occur in this species.[2]
Chemical tests reveal that the thallus is UV−, C−, P−, and K+ (yellow). Thin-layer chromatography, a technique used to identify chemical substances, shows the presence of hypostictic acid as the major component, and trace amounts of hypoconstictic acid.[2]
Habitat and distribution
Allographa hypostictica was found on a sandstone boulder in an open cerrado habitat. This lichen is only known to occur in Brazil.[2][3]
References
- ↑ "Allographa hypostictica Kalb & Aptroot". Species 2000: Naturalis, Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/BWTP.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ Reis Silva, Jeanne dos; Aptroot, André; da Silva Cáceres, Marcela Eugenia (2023). "Lichens from dry Central Brazil: A checklist of lichenized fungi from Distríto Federal and Goiás". Cryptogamie, Mycologie 44 (9): 117–133. doi:10.5252/cryptogamie-mycologie2023v44a9. https://zenodo.org/record/8434271.
Wikidata ☰ Q107479094 entry
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