Biology:Hypogymnia pendula
| Hypogymnia pendula | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Lecanorales |
| Family: | Parmeliaceae |
| Genus: | Hypogymnia |
| Species: | H. pendula
|
| Binomial name | |
| Hypogymnia pendula McCune & Li S.Wang (2014)
| |
Hypogymnia pendula is a rare species of foliose lichen in the family Parmeliaceae.[1] It is characterised by its [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] (hanging) growth form and distinct chemical composition.
Taxonomy
Hypogymnia pendula was first described by Bruce McCune and Li-Song Wang in 2014. The species was named pendula due to its tendency to grow in a [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] manner. The holotype specimen was collected in Yunnan, China, in the Jianchuan County at the trailhead to Lao Juen Shan, within an Abies delavayi–Rhododendron forest near a hotel.[2]
Description
The Hypogymnia pendula thallus is pendulous and can grow up to 10–12 cm (3.9–4.7 in) in length. Its texture is [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and its branching is mostly [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] with budding present. The upper surface of the thallus is smooth, later becoming [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] or [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], and is whitish to pale greenish-grey in colour. It often has a black border and lacks [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], sometimes displaying dark mottles. The [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]] range from 0.5–3 mm in width, and can be separate or contiguous to [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]]. The lobe tips and axils are [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], as is the lower surface, which has rimmed holes.[2]
Hypogymnia pendula is unique in its genus due to its large spores, which measure 12–16 by 9–12 μm. Most Hypogymnia species, in contrast, have spores that are less than 10 μm long.
Hypogymnia pendula is chemically distinct from its close relative, Hypogymnia macrospora, as it contains physodalic, protocetraric, and physodic acids instead of 4-O-demethylbarbatic acid. This results in a P+ (orange-red) reaction, in contrast to the P− reaction of H. macrospora. Additionally, H. pendula has a [[Glossary of lichen terms#{{biology:{1}}}|POL−]] [[Glossary of lichen terms#{{biology:{1}}}|{{Biology:{1}}}]], while H. macrospora's hypothecium is POL+–indicating the presence of crystalline substances.[2]
Habitat and distribution
This lichen species has been found on the bark of fir trees. Its known distribution is limited to Yunnan Province, specifically Jianchuan and Zhongdian Counties. At the time of publication, only three well-developed specimens had been discovered.[2]
References
- ↑ "Hypogymnia pendula McCune & Li S. Wang". Species 2000: Naturalis, Leiden, the Netherlands. https://www.catalogueoflife.org/data/taxon/6MQS2.
- ↑ 2.0 2.1 2.2 2.3 McCune, B.; Wang, L.S. (2014). "The lichen genus Hypogymnia in southwest China". Mycosphere 5 (1): 27–76. doi:10.5943/mycosphere/5/1/2. http://mycosphere.org/pdf/Mycosphere_5_1_2.pdf.
Wikidata ☰ Q28869230 entry
 |  |
