Anaptychia ciliaris
Anaptychia ciliaris | |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Fungi |
Division: | Ascomycota |
Class: | Lecanoromycetes |
Order: | Caliciales |
Family: | Physciaceae |
Genus: | Anaptychia |
Species: | A. ciliaris
|
Binomial name | |
Anaptychia ciliaris (
Flot. (1850) | |
Synonyms[1] | |
List
|
Anaptychia ciliaris, commonly known as the great ciliated lichen or eagle's claws, is a species of fruticose lichen in the family Physciaceae.[2] It is predominantly found in Northern Europe, with its range extending to European Russia, the Caucasus, Central and Southern Europe, the Canary Islands, and some parts of Asia. First mentioned in botanical literature by Italian botanist Fabio Colonna in 1606, the species was formally described by Carl Linnaeus in 1753, who highlighted its unique physical characteristics such as its grey colour, its unusual leafy form with linear fringe-like segments, and the presence of hair-like structures (cilia). This lichen is adaptable in its choice of substrates, mostly growing on tree barks, and less commonly on rocks.
Throughout history, the lichen has played been used in early scientific investigations about
Anaptychia ciliaris is readily recognisable by its fruticose (bushy) thallus that varies in colour from greyish-white to brownish-grey, to greenish when wet, and its large and distinctive cilia. The lichen can form extensive colonies made of neighbouring lichens each attached to the substrate at a single point, all with narrow lobes, known as laciniae, growing outwards. These laciniae, which are covered in fine hairs, split repeatedly into equal branches. Circular reproductive structures (apothecia) with brown discs occur on the thallus surface. The internal anatomy of A. ciliaris makes it sensitive to air pollutants, leading to observable changes in its form when exposed to these conditions. Two species of green algae in the genus Trebouxia have been shown to serve as the photobiont partners of this lichen.
Taxonomy
According to
Anaptychia ciliaris is the
Vernacular names that have been used for Anaptychia ciliaris include "great ciliated lichen"[9] and "eagle's claws".[10]
Subtaxa
Several subspecies (subsp.), varieties (v.), and forms (f.) of the lichen have been described; Index Fungorum lists 45 of these subtaxa.[11] This following list is representative, but not exhaustive:
- f. ciliaris
- This is the nominate form, in which pycnidia (asexual fruiting bodies) are rare or absent, and the margins of apothecia are distinctly lacinulate (i.e., fringed or tattered).[6]
- f. agropia (Ach.) Boist. (1903)[12]
- In this form, pycnidia are rare or absent, and the margins of apothecia are crenate (scalloped) or almost entire (i.e., smooth and not lobed or toothed).[6]
- f. verrucosa (Ach.) Boist. (1903)[12]
- In this form, pycnidia are numerous; the verrucae (small wart-like protuberances) are the same colour as the thallus or somewhat darker.[6]
- f. melanosticta (Ach.) Boberski (1886)
- In this form, pycnidia are numerous; the verrucae are dark brown to blackish brown.[6]
- f. nigrescens (Bory) Zahlbr. (1931)[13]
- In this form the laciniae are less than 2 mm wide.[6]
- subspecies mamillata (Taylor) D.Hawks. & P.James (1980)[14]
- Compared to the nominate variety, subsp. mamillata has narrower lobes (about 2 mm wide), and a colouration that ranges from dark grey to brown when dry, to dark-olive green when wet, and its lacks and pruina on the thallus surface.[15]
- var. melanosticta (Ach.) Boisel (1903)[12]
- This variety is dark brown with a sparsely hairy upper surface and is mainly found on seaside rocks, especially rocks visited by birds.[16]
In 1962, Kurokawa identified five forms of Anaptychia ciliaris.
Description
The growth form of Anaptychia ciliaris merges characteristics of both foliose (leafy) and fruticose (bushy) lichens. Like many fruticose species, this lichen attaches to its substrate at a single point. Its fronds, akin to lobes of foliose lichens, lie close to the substrate with distinct upper and lower structures in a dorsiventral organization. This structure comprises an upper fibrous cortex of tightly packed hyphae and an algal layer with interspersed photobionts between the cortex and the medulla's looser hyphae. Its lower cortex is made of hyphae that are aligned more or less parallel to the surface. The lichen's upper surface is greyish, and the underside can be greyish or whitish,[19] with both sides turning green when wet.[20]
The loose attachments this lichen forms with its substrate contributes to the development of extensive colonies that can span up to 15 cm (6 in) or more in diameter. These colonies comprise neighbouring individuals each with elongated, linear structures (laciniae) that repeatedly branch dichotomously (into roughly equally sized parts). The laciniae generally have an upward, somewhat ascending orientation. Their width is up to about 2 mm (1⁄16 in), and they are about 300 μm thick. They appear either flat or somewhat convex and are covered in soft, fine hairs (pubescence).[6] The fibrous outer cortex imparts some structural strength to the laciniae, which contributes to their ability to maintain an upright orientation.[21] Numerous pale, lateral cilia lie along the margins of the laciniae.[15] They are dark grey to black, and up to 15 mm (3⁄5 in) long.[16] Sometimes, these long cilia form hapters—aerial attachment organs with highly adhesive hyphae. Upon contact with nearby surfaces, often another lobe of its own thallus, these hapters induce branching and create a spreading sheath, leading to entanglement.[22]
On the undersurface of the laciniae, the thallus is decorticate (i.e., it lacks a cortex) and appears paler than its upper surface. The lower surface features irregular veining and is adorned with rhizines (attachment structures) along the margins, which are the same colour as the thallus. These rhizines measure between 1 and 6 mm (1⁄16 and 1⁄4 in) in length and may be either simple or occasionally branched towards the tips. The upper cortex of the laciniae has irregular thickening, and its lower surface has flexuous contours, occasionally extending downward to the lower surface of the thallus. The photobiont layer, housing cells measuring 10–15 μm in diameter, is frequently interrupted by the upper cortex, resulting in a discontinuous pattern. The medullary layer is typically very thin and may even be evanescent in some regions.[6]
Apothecia, the reproductive structures, are found on the thallus. These structures are usually
No lichen products have been identified from Anaptychia ciliaris, and it does not react with any of the standard chemical spot tests used to help identify lichens.[6]
The morphology of A. ciliaris changes when exposed to adverse concentrations of ambient levels of air pollutants. It stops producing cilia, and the lobes become shorter and develop a warty upper surface.[24]
Photobiont
The
In 2014, a different member of
Similar species
The
Habitat and distribution
Anaptychia ciliaris, primarily found in
Anaptychia ciliaris has adapted to growth on various
In Poland, Anaptychia ciliaris is among six endangered species listed on the National red list.[42] In Moscow's East European Plain area, it is an uncommon species and listed in the 2018 Red Data Book of the Moscow Region. It mostly found in the area's birch grass-marsh forests, with its limited presence attributed to the air pollution from Moscow.[43] Austria's Regional Red List also classifies A. ciliaris as endangered.[40] Once common sight in Upper Austria, its decline is due to less availability of preferred substrate like mature, moss-covered, fertilised and dust-impregnated barks. Contemporary practices often result in the removal of trees before their bark matures to a consistency suitable for A. ciliaris.[44]
Historical North American literature occasionally mentions the presence of A. ciliaris, but such references are misinterpretations. These instances refer to A. setifera, and A. ciliaris is not native to the continent.[45]
Biomonitoring
Anaptychia ciliaris is used in biomonitoring due to its sensitivity to air pollution. This lichen serves as an indicator of environmental health, reflecting changes in air quality and pollutant levels.
In Denmark and North Germany, a method was developed to gauge SO2 emissions using the health and fertility of indicator lichens like A. ciliaris.[24] Similarly, England and Wales adopted a scale rating zones from 0 (most polluted) to 10 (least polluted), with A. ciliaris typically found in zones above 7, corresponding to SO2 levels around 40 micrograms per cubic metre.[46] Historically common in 19th-century Netherlands, A. ciliaris experienced a significant decline throughout the 20th century. However, healthy specimens were unexpectedly found in 2010 on young ash trees in Brabant, a resurgence attributed to reduced air pollution and climate warming.[47]
Monitoring the breakdown of
In Sweden, A. ciliaris has a history of being used for monitoring atmospheric pollution.[51] Following the Chernobyl disaster, it played a significant role in the biomonitoring of airborne radioactive fallout, with detected caesium-137 activity in Anaptychia ciliaris reaching as high as 14560 becquerels per kilogram.[52]
Uses
In the 17th Century, "Cyprus Powder" was used as a
In the Erkowit region of eastern Sudan, the lichen, known locally as bakour, was mixed with other plants and burned to repel insects.[32]
Research
Historically, the lichen Anaptypia ciliaris has played a significant role in various scientific explorations of lichen structure and physiology. Early on, the French botanist Joseph Pitton de Tournefort reportedly first observed the lichen's distinctive large, dark-coloured spores.[55] In 1849,[56] Holle detailed the development of hyphae from lichen spores, using A. ciliaris as the subject of his study.[57] In 1850 and 1851, the lichen was used by the German botanist Hermann Itzigsohn to demonstrate the existence of "spermagones" (conidia).[23] In 1853,[58] Julius Ferdinand Speerschneider, another German botanist, reported the division of the lichen's photobiont cells (then referred to as gonidia) in moist thallus sections.[59] He found that in humid air, hyphae decomposed within two months, while algae thrived, growing and dividing rapidly. Subsequently, small, light green structures emerged in the decomposing thallus centre, evolving into lichen primordia.[60]
Further insights into lichen structure came when Reginald Heber Howe, Jr. presented the lichen's cortex as an exemplar of the "fibrous" cortex — a tissue type characterised by long, slender, infrequently branched hyphae growing parallel to the surface.[61] The German bryologist Johann Hedwig, in the eighteenth century, expanded on these findings. In his 1784 work Fundamentum Historiae Naturalis Muscorum Frondosorum, he described and depicted Anaptypia ciliaris apothecia, dark septate spores, and pycnidia. He identified tiny bodies associated with the organism, measuring approximately 50 μm long and 24 μm thick, as "semina"[62] — a term Acharius later replaced with "spores" in 1803.[63]
In the following century, research on Anaptypia ciliaris advanced further.
More recent research on Anaptychia ciliaris has uncovered various potential
Growth in culture
The
Anaptychia ciliaris shows variability in spore production from its similarly sized apothecia, reflecting differences in both the quantity of spores and their stages of development. This variation emphasises the impact of its
Species interactions
Anaptychia ciliaris interacts with various
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Cited literature
- Smith, Annie Lorrain (1921). Lichens. Cambridge Botanical Handbooks. London: Cambridge University Press.