Peltigera castanea
Species of lichen / From Wikipedia, the free encyclopedia
Peltigera castanea is a species of terricolous and muscicolous (ground- and moss-dwelling), foliose lichen in the family Peltigeraceae.[2] Described as a new species in 2003, it is part of the taxonomically challenging species complex centred around Peltigera didactyla. Recognised based on phylogenetic studies that highlighted its unique genetic markers, P. castanea is distinguished by its dark, chestnut-coloured upper surface, which inspired its vernacular name, chestnut pelt lichen. Its known distribution includes North America (British Columbia, Western Canada), Asia (China and Siberia), Europe (Estonia), Greenland, and the Antarctic. The conservation status of Peltigera castanea varies regionally, from being critically imperiled in British Columbia and Yukon to critically endangered in Estonia due to significant habitat degradation and restricted population size.
Peltigera castanea | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Fungi |
Division: | Ascomycota |
Class: | Lecanoromycetes |
Order: | Peltigerales |
Family: | Peltigeraceae |
Genus: | Peltigera |
Species: | P. castanea |
Binomial name | |
Peltigera castanea Goward, Goffinet & Miądl. (2003) | |
Holotype: Clearwater River Basin, Canada[1] |
Peltigera castanea is distinguished by its foliose, leaf-like thallus that loosely attaches to the substrate, covering up to 8 cm (3+1⁄8 in) with stiff, overlapping lobes that often curl upwards. Its distinctive upper surface is chestnut-brown, turning pale bluish-grey when sheltered, and features granular soredia for vegetative reproduction, housed within irregularly shaped soralia. The lichen's densely veined lower surface transitions from white to black, with tufted rhizines that become woolly towards the centre. Compared to related species in the genus Peltigera, such as P. extenuata and P. didactyla, P. castanea has a smooth, shiny, mostly non-tomentose upper cortex, darkening veins, and flocculent, often tufted rhizines, whereas its relatives show variations in lobe concavity and surface texture, including the presence of apothecia (fruiting bodies).