Biology:Pseudopyrenula hexamera
| Pseudopyrenula hexamera | |
|---|---|
Scientific classification 
| |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Dothideomycetes |
| Order: | Trypetheliales |
| Family: | Trypetheliaceae |
| Genus: | Pseudopyrenula |
| Species: | P. hexamera
|
| Binomial name | |
| Pseudopyrenula hexamera Aptroot (2016)
| |
Pseudopyrenula hexamera is a species of bark-dwelling, crustose lichen in the family Trypetheliaceae.[1] It is distinguished within its genus by having five-septate spores, a unique feature among Pseudopyrenula species. The species is known only from Venezuela, where it was collected in lowland Amazonian rainforest.
Taxonomy
The species was formally described from a type specimen collected on the west bank of the Surumoni River, near Esmeralda in the Alto Orinoco region of Amazonas state, Venezuela, at an elevation of 110 m (360 ft). The specimen was found on the bark of a tree in the genus Qualea. It is the only member of Pseudopyrenula with consistently five-septate ascospores. While it resembles Polymeridium quinqueseptatum, it differs by the thickened walls of its spores, which give rise to the diamond-shaped internal cavities ([[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]) typical of Pseudopyrenula.[2]
Description
The thallus is thin, whitish, and lacks a distinct outer [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (ecorticate). The fruiting bodies (ascomata) are produced singly or occasionally in small lateral groups; they are hemispherical, black, and about 0.2 mm in diameter, with a tiny apical pore (ostiole) that is also black. The internal tissue ([[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]) is clear and colourless, without oil droplets (not inspersed). Each ascus contains eight colourless ascospores that are divided by five cross-walls (5-septate). The spores measure 16–21 × 6–7 μm, have smooth walls, are surrounded by a thin gelatinous sheath about 1 μm thick, and display diamond-shaped lumina created by thickening of the inner spore wall.[2]
The thallus does not fluoresce under ultraviolet light (UV−), and thin-layer chromatography detected no secondary metabolites.[2]
Habitat and distribution
Pseudopyrenula hexamera has been collected on smooth bark of rainforest trees and is known only from its type locality in Venezuela (Amazonas state, Alto Orinoco).[2]
References
- ↑ "Pseudopyrenula hexamera Aptroot". Species 2000: Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/6WGSZ.
- ↑ 2.0 2.1 2.2 2.3 Aptroot, André; Ertz, Damien; Etayo Salazar, Javier Angel; Gueidan, Cécile; Mercado Diaz, Joel Alejandro; Schumm, Felix; Weerakoon, Gothamie (2016). "Forty-six new species of Trypetheliaceae from the tropics". The Lichenologist 48 (6): 609–638. doi:10.1017/s002428291600013x.
Wikidata ☰ Q108299769 entry
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