Biology:Harusavskia
| Harusavskia | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Teloschistales |
| Family: | Teloschistaceae |
| Genus: | Harusavskia S.Y.Kondr. (2017) |
| Species: | H. elenkinianoides
|
| Binomial name | |
| Harusavskia elenkinianoides S.Y.Kondr., X.Yuan Wang, S.O.Oh & Hur (2017)
| |
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| Holotype site: Laguna del Maule, Chile | |
Harusavskia is single-species fungal genus in the family Teloschistaceae.[1] It contains the little-known species Harusavskia elenkinianoides, a saxicolous (rock-dwelling), crustose lichen. This species is known only from its original collection site near the Laguna del Maule in Chile.
Taxonomy
Harusavskia elenkinianoides was formally described as a new species in 2017. The type specimen was collected from the Laguna del Maule in Chile at an elevation of 1,887 m (6,191 ft), where it was found growing on siliceous rock. The genus name derives its name from two key characteristics. Firstly, it references the distinctive "[[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]" around the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], a key feature in its spore structure. Secondly, the name pays homage to its resemblance to Rusavskia elegans, to which this lichen was first included. The species epithet alludes to a resemblance with Elenkiniana gomerana, a lichen found in the Canary Islands. Phylogenetically, genus Harusavskia is in the Filsoniana clade of the subfamily Teloschistoideae in the family Teloschistaceae.[2]
Description
In the genus Harusavskia, the thallus is [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] at the centre, meaning it has a cracked, patchy appearance, and transitions to a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] form at the edges with well-defined [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. The colour of the thallus ranges from yellow-brownish orange to brownish yellow-orange. The outer, or peripheral, portions are either [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] or slightly shiny, featuring relatively few pseudocyphellae – small, white, porous spots. In contrast, the central area has numerous pseudocyphellae, giving it an eroded appearance with a whitish-brownish yellow-orange hue. The thallus can grow to a diameter of several centimetres.[2]
The apothecia (fruiting bodies) of Harusavskia are typically 0.4 to 1.3 mm in diameter and about 0.5 mm thick. They are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] in form. This means they have a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] – a rim that is similar in composition to the thallus – coloured yellowish-brownish orange, and a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] that is usually flat and dark brownish brick-orange. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], the layer just outside the reproductive cells, has a complex or globular cellular structure with very thin cell walls. The thalline exciple's cortical layer is composed of densely packed cells. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], the layer below the hymenium, contains numerous oil droplets. The asci (spore-bearing cells) typically contain eight spores. These spores are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], with an undeveloped or only partially developed septum (a dividing wall), visible only in their early stages. They are surrounded by a distinct halo that is 1 to 1.2 (up to 1.5) μm wide when treated with a solution of potassium hydroxide.[2]
Chemically, Harusavskia reacts distinctly to potassium hydroxide solution (i.e., the K spot test). The thallus turns purple, while the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]](the top layer above the hymenium) and the cortical layer of the thalline exciple change to a bright crimson purple. The cortex of the thalline section reacts by turning bluish, violet, or ink-purple.[2]
Habitat and distribution
At the time of its original publication, Harusavskia elenkinianoides was known to occur only at its type locality in Chile, where it grows on siliceous rock.
References
- ↑ "Harusavskia". Species 2000: Naturalis, Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/4TY4.
- ↑ 2.0 2.1 2.2 2.3 Kondratyuk, S.Y.; Lőkös, L.; Upreti, D.K.; Nayaka, S.; Mishra, G.K.; Ravera, S.; Jeong, M.-H.; Jang, S.-H. et al. (2017). "New monophyletic branches of the Teloschistaceae (lichen-forming Ascomycota) proved by three gene phylogeny". Acta Botanica Hungarica 59 (1–2): 71–136 [97]. doi:10.1556/034.59.2017.1-2.6.
Wikidata ☰ Q43957174 entry
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