Biology:Placolecis kunmingensis
| Placolecis kunmingensis | |
|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Lecanorales |
| Family: | Catillariaceae |
| Genus: | Placolecis |
| Species: | P. kunmingensis
|
| Binomial name | |
| Placolecis kunmingensis A.C.Yin & Li S.Wang (2019)
| |
| <mapframe zoom="4" frameless="1" align="center" longitude="102.83333333333" latitude="25.35" height="200" width="270">{"type":"Feature","geometry":{"coordinates":[102.83333333333333,25.35],"type":"Point"},"properties":{"title":"Placolecis kunmingensis","marker-color":"#5E74F3"}}</mapframe> | |
| Holotype site: Baiyi village (Kunming, China)[1] | |
Placolecis kunmingensis is a species of saxicolous (rock-dwelling), crustose lichen in the family Catillariaceae.[2] It is found in Yunnan, China. The lichen is characterised by a thallus that is [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] to [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] in its centre, forming irregular patches or clumps 10–50 mm wide, as well as its ellipsoid or spherical [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] with slightly thickened wall.
Taxonomy
The lichen was formally described as a new species in 2019 by An-Cheng Yin and Li-Song Wang. The type specimen was collected in Baiyi village (Kunming, Yunnan province) at an elevation of 2,130 m (6,990 ft). This specimen, collected by Wang and colleagues on April 12, 2018, was found growing on rock.[1]
Description
Placolecis kunmingensis has a crustose (crust-like) to [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (radiating) thallus, forming irregular patches or clumps ranging from 10 to 50 mm wide. In the centre, it features [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]-[[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (divided into small, scale-like sections) structures, with shorter [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] sometimes radiating at the margins. These lobes are typically 0.5 to 1 mm long and 0.2 to 0.3 mm wide in the middle, expanding to 0.35 to 0.5 mm at the tips, dark brown in colour, and swollen at the tip. They have equal [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (evenly branching) patterns, with secondary lobules sometimes indistinct from the main lobes. The upper surface of the thallus is dark brownish and uneven.[1]
The upper [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is 25 to 30 µm thick and has a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (loosely interwoven) structure. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] is uniform, 50 to 70 µm thick, with Trebouxia-like (a type of green algae) [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] cells measuring 7 to 12.5 µm in diameter. The medulla (internal layer) is 180 to 250 µm thick, with a reddish-orange upper portion and a white lower portion. There is no lower cortex present.[1]
Reproductive structures (apothecia) are 0.3 to 1.2 mm in diameter, sessile (attached directly without a stalk), [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and range from scattered to crowded, with a well-developed, black margin. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (the outer rim of the apothecium) is 40 to 60 µm thick at the sides and black in colour. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (uppermost layer of the apothecium) is 7 to 15 µm thick and brown. The hymenium (spore-bearing layer) is hyaline (translucent), 50 to 75 µm thick. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (layer beneath the hymenium) is 75 to 120 µm thick and brown. The asci (spore-producing structures) are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (club-shaped) to cylindrical, Catillaria-type with an amyloid [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and contain eight spores. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (filament-like structures in the hymenium) are simple or sparsely branched, with a dark brown cap at the apex. [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] are hyaline (translucent), simple, spherical or ellipsoid, measuring 5 to 10 by 4 to 6 µm, with a smooth wall 0.5 to 1 µm thick. [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (asexual reproductive structures) are numerous, mostly immersed in the thallus about two-thirds of the way in. They are pear-shaped, measure 150 to 190 by 100 to 130 µm, and have a slightly black ostiole (opening). The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (asexual spores) are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (rod-shaped), measuring 3 to 5 µm.[1]
In terms of reactions to standard chemical spot tests, the medulla is K+ (violet) in its upper yellow portion, and P−, C−. The use of thin-layer chromatography shows the presence of fragilin and an anthraquinone substance.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Yin, An Cheng; Wang, Xin Yu; Liu, Dong; Zhang, Yan Yun; Yang, Mei Xia; Li, Li Juan; Wang, Li Song (2019). "Two new species of Placolecis (lichenized Ascomycota) from China". Mycobiology 47 (4): 401–407. doi:10.1080/12298093.2019.1672984. PMID 32010461.
- ↑ "Placolecis kunmingensis A.C. Yin & Li S. Wang". Species 2000: Naturalis, Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/9ZDNB.
Wikidata ☰ Q108241930 entry
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