Biology:Enterographa aldabrensis
| Enterographa aldabrensis | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Arthoniomycetes |
| Order: | Arthoniales |
| Family: | Roccellaceae |
| Genus: | Enterographa |
| Species: | E. aldabrensis
|
| Binomial name | |
| Enterographa aldabrensis Sparrius (2009)
| |
Enterographa aldabrensis is a species of corticolous (bark-dwelling), crustose lichen in the family Roccellaceae.[1] It is only known to occur in Aldabra in the Seychelles.
Taxonomy
Enterographa aldabrensis was formally described as a new species by the Dutch lichenologist Laurens Benjamin Sparrius. The species is characterised by its [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] that contain three septa and absence of norstictic acid, distinguishing it from closely related species such as Enterographa subserialis and E. elixii.[2]
Description
The lichen has a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] up to 5 cm (2 in) in diameter, [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] to [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], white to cream-coloured, and water-repellent, measuring 50–100 μm thick. It contains Trentepohlia ( a genus of green algae) as its [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] partner. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is very thin, grey or absent. The upper algae-free medulla is about 10 μm thick, consisting of densely interwoven hyphae. The medulla is cream-coloured with abundant [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] measuring 10–20 μm in diameter.[2]
Ascomata are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] or slightly comma-shaped, [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], measuring 0.05 by 0.05–0.10 mm, with a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] that is dark brown to black and [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. The thalline margin is approximately 0.1 mm wide and forms linear, frequently branched [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], which may become mixed with neighbouring pseudostromata. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is 5–10 μm wide, hyaline (translucent) in section but often brown near the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is hyaline, 10–30 μm tall, and the hymenium is hyaline, 80–100 μm tall.[2]
The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is 10–12 μm tall, orange-brown, with crystals of about 0.5 μm in diameter, and reacts K+ (green). [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] are cylindrical, 60–80 by 12–20 µm, and have eight spores. [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], somewhat constricted around the middle, measuring 13–18 by 4.0–5.5 μm, 3-septate, with a perispore less than 2.0 μm thick. [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] appear as dark brown dots along the thallus margin, and [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] are rod-shaped, measuring 0.7 by 2.0–2.5 μm.[2]
Chemistry
The thallus of Enterographa aldabrensis reacts C−, K+ (yellowish), P+ (yellow), UV+ (cream-coloured) to standard chemical spot tests. Thin-layer chromatography reveals the presence of psoromic acid. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] show an [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] reaction, I+ and KI+ (dark blue), while the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] react I+ (red) and KI+ (dark blue).[2]
Habitat and distribution
This species is known only from the type locality in Aldabra, Seychelles. It grows on the bark of coastal trees and shrubs.[2]
Similar species
Enterographa aldabrensis is recognised by its thin, pale thallus with black [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], immersed ascomata arranged in lines. It is morphologically and chemically similar to E. subserialis but differs in having 3-septate [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and a K+ (green) [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. It lacks trace amounts of norstictic acid found in the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] of similar species. This species is differentiated from E. compunctula, which also has 3-septate [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], by its chemical composition and the shape of its [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]].[2]
References
- ↑ "Enterographa aldabrensis Sparrius". Species 2000: Naturalis, Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/39Y5H.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Seaward, Mark D.; Aptroot, André (2009). "Checklist of lichens for the Seychelles group". Biodiversity and ecology of lichens – Liber Amicorum Harrie Sipman. Bibliotheca Lichenologica. 99. pp. 335–366. https://www.researchgate.net/publication/288429050.
Wikidata ☰ Q21252952 entry
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