Biology:Caloplaca letrouitioides
| Caloplaca letrouitioides | |
|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Teloschistales |
| Family: | Teloschistaceae |
| Genus: | Caloplaca |
| Species: | C. letrouitioides
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| Binomial name | |
| Caloplaca letrouitioides S.Y.Kondr., Elix & Kärnefelt (2011)
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Caloplaca letrouitioides is a little-known species of corticolous (bark-dwelling), crustose lichen belonging to the family Teloschistaceae,[1] described in 2011. It is known to occur in Victoria, Australia. The species was named for its superficial resemblance to species in the genus Letrouitia. The anatomical characteristics of Caloplaca letrouitioides, particularly the well-developed [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and the unexpanded [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] tips, along with the absence of algae in the apothecia, set it apart from other species in the genus.
Taxonomy
Caloplaca letrouitioides was identified and described in 2011 by the lichenologists Sergey Kondratyuk, John Elix, and Ingvar Kärnefelt. The type specimen was collected by Rex Filson in 1976 from Gunnamatta Beach in Victoria, Australia. Its specific epithet, letrouitioides, alludes to its resemblance to species in the genus Letrouitia.[2]
Description
The thallus of Caloplaca letrouitioides can spread several centimetres wide, characterised by a grey to whitish-grey colour. It is thin and smooth, with a flat to slightly uneven surface. Some parts of the thallus may have blackish edges. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is not visible in this species. Apothecia are common, measuring 0.4–0.9 mm in width. They are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], with a distinct yellow to orange margin that is significantly thick and elevated above the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. The disc is brown to brownish-orange and can be flat to slightly concave. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] of the apothecia is thick, consisting of radiating hyphae, and has a brownish-orange outer layer. The hymenium is hyaline, and the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] has a brownish-orange hue. The asci typically contain 2–4 spores, with [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] being elongated to cylindrical ellipsoid in shape with a broad septum. [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] are dark reddish, but conidia were not observed in the type specimen.[2]
Chemical analysis of Caloplaca letrouitioides shows that the [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] and outer portions of the true exciple react to potassium hydroxide (i.e., the K spot test) by turning reddish-purple.[2]
Similar species
Caloplaca kiewkaensis is similar to C. letrouitioides, with both species featuring a very thin, smooth, greyish or greyish-white thallus without isidia and soredia, and a thick proper margin above the disc level with medium-sized ascospores with a broad septum. However, C. kiewkaensis is distinguished by its thicker, [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] apothecia (as opposed to the biatorine type in C. letrouitioides), a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] true exciple, eight-spored asci with oil droplets (compared to 2–4 spored in C. letrouitioides), somewhat wider ascospores, and a narrower ascospore septum.[2]
Habitat and distribution
At the time of its original publication, Caloplaca letrouitioides was known only from the type collection made in Victoria, Australia. The species grows on the bark of thin twigs.[2]
See also
References
- ↑ "Caloplaca letrouitioides S.Y. Kondr., Elix & Kärnefelt". Species 2000: Naturalis, Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/PZYV.
- ↑ 2.0 2.1 2.2 2.3 2.4 Kondratyuk, S.Y.; Elix, J.A.; Galanina, I.A.; Yakovchenko, L.S.; Kärnefelt, I.; Thell, A. (2011). "Four new Caloplaca species (Teloschistaceae, Ascomycotina)". Folia Cryptogamica Estonica 48: 17–23.
Wikidata ☰ Q17387911 entry
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