Biology:Myeloconis parva
| Myeloconis parva | |
|---|---|
Scientific classification 
| |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Gyalectales |
| Family: | Trichotheliaceae |
| Genus: | Myeloconis |
| Species: | M. parva
|
| Binomial name | |
| Myeloconis parva P.M.McCarthy & Elix (1996)
| |
Myeloconis parva is a species of corticolous (bark-dwelling), crustose lichen in the family Trichotheliaceae.[1] Found in Amazonian Brazil, it was formally described as a new species in 1996 by Patrick M. McCarthy and John Elix.[2]
Description
Myeloconis parva has a thallus that is grayish or greenish-brown, and can grow up to 6–10 cm (2.4–3.9 in) or more wide. The thallus is continuous, with a matte to slightly glossy surface that is closely appressed or somewhat raised near the margin. Closer to the centre, the thallus is raised, peeling and flaking, and very uneven, and is approximately 30–100 μm thick. The lichen has no [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], but has an uppermost layer that is amorphous and 6–10 μm thick. The algal cells are 5–12 by 5–10 μm, and the medulla contains masses of sulphur-yellow crystals that are sometimes exposed. When treated with K, the crystals turn reddish, but they do not fluoresce under UV light. The hyphae are 2–3 μm wide, and the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is thin, dark brown to almost black.[2]
Ascomata are very uncommon in Myeloconis parva, and are mostly immature. They are almost entirely immersed in the thallus and have an outwardly inconspicuous appearance. The ascomata are irregularly convex thalline swellings, each with a shallow, 70–100 μm diameter, apical depression and a minute, medium to dark brown ostiole. The ascomatal wall is dark olive-brown to almost black, 50–90 μm thick near the apex, and 40–60 μm thick at the base. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is pale to medium brown and is approximately 20 μm thick. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is spherical and is 0.2–0.4 mm in diameter, while the [[Glossary of lichen terms#{{biology:{1}}}|hamathecial]] filaments are 0.7–1 μm thick. Mature asci have not been observed. The ascospores are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] to elongate-fusiform and are irregularly massed or [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] in the asci. They have 21–26 transverse divisions, with each loculus having 1 or 2 (sometimes 3) longitudinal or diagonal divisions. The ascospores have a 2–3 μm-thick wall and are 94–132 by 18–23 μm in size.[2]
References
- ↑ "Myeloconis parva P.M. McCarthy & Elix". Species 2000: Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/452BT.
- ↑ 2.0 2.1 2.2 McCarthy, P.M.; Elix, J.A. (1996). "Myeloconis, a new genus of pyrenocarpous lichens from the tropics". The Lichenologist 28 (5): 401–414. doi:10.1006/lich.1996.0038.
Wikidata ☰ Q10591670 entry
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