Ochrolechia insularis

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Ochrolechia insularis
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Pertusariales
Family: Ochrolechiaceae
Genus: Ochrolechia
Species:
O. insularis
Binomial name
Ochrolechia insularis
Kantvilas & Elix (2011)

Ochrolechia insularis is a rare species of crustose lichen in the family Ochrolechiaceae. [1] Found only on Kangaroo Island in South Australia, it forms an intricate crust on granite rocks near the sea, providing a habitat for a diverse range of species.

Contents

Taxonomy

Ochrolechia insularis, formally described by Gintaras Kantvilas and John Elix, is a seemingly rare species of lichen with no known apothecia . The species was first discovered on Kangaroo Island in South Australia, at Cape Willoughby, in September 2009. The specific epithet insularis refers to the species' habitat on Kangaroo Island, which is located off the southern coast of mainland Australia. [2]

Description

The Ochrolechia insularis lichen forms an irregular crust, varying in thickness from 0.3 to 4.5 mm, with a smooth, glossy, and white upper surface. Its appearance is characterised by intense papillae , nodules, or plicae. Its cortex , comprising irregularly orientated, branched and anastomosing, short-celled hyphae, is 15–30  μm thick. The photobiont cells, concentrated in a subcortical layer , are spherical, with diameters ranging from 6 to 15 μm. [2]

The lichen's secondary chemistry includes gyrophoric acid, lecanoric acid, and 2'-O-methyllecanoric acid, with reactions including K–, KC+ red, C+ red, P–, and UV– for both cortex and medulla. Ochrolechia insularis is morphologically similar to O. tartarea , a saxicolous (rock-dwelling) species, but differs in its smooth, glossy upper surface and lack of a prothallus. [2]

Habitat and distribution

Ochrolechia insularis is known to occur only at the type locality on Kangaroo Island, [3] where it grows on large, sunny, windswept granite boulders overlooking the sea, but well above the normal level of sea spray. The lichen forms part of the typical community that dominates coastal granite rocks in Southern Australia, which includes species of Rinodina , Tylothallia , Xanthoria , Buellia , Caloplaca , and Xanthoparmelia . [2]

Despite searches in similar habitats both near the type locality and further afield, such as on Flinders Island in Bass Strait, no additional occurrences of Ochrolechia insularis have been found, suggesting that this species is extremely rare and localised. [2]

Conservation concerns

Ochrolechia insularis is a species of high conservation value due to its extremely uncommon and localised nature. The primary site where it grows is heavily degraded by the impact of sheep grazing and other disturbances, raising concerns about the future of this lichen. [2]

Related Research Articles

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<i>Ochrolechia africana</i> Species of lichen

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Ramboldia blastidiata is a species of saxicolous (rock-dwelling) and crustose lichen in the family Lecanoraceae. Found in Australia, it was formally described as a new species in 2007 by lichenologists Gintaras Kantvilas and John Elix. The type specimen was collected by the first author from the western slopes of Strzelecki Peaks on Flinders Island (Tasmania) at an altitude of 150 m (490 ft); here, in dry sclerophyll forest, it was found growing on a granite boulder. The lichen forms pale grey-green, olive-green to dull olive-brown crust-like patches up to 30 cm (12 in) wide. The authors suggest that it is widespread in temperate Australia and Tasmania, but not commonly collected. Others saxicolous lichens that it usually grows with include Ramboldia petraeoides, Lecanora farinacea, Xanthoparmelia mougeotina, and species from the genera Buellia and Rhizocarpon. The specific epithet blastidiata refers to the presence of blastidia, which are vegetative propagules that contain mycobiont and photobiont and are produced by yeast-like budding.

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Coenogonium atherospermatis is a species of lichen in the family Coenogoniaceae. Found in Tasmania, it was formally described as a new species in 2018 by lichenologists Gintaras Kantvilas, Eimy Rivas Plata, and Robert Lücking. The type specimen was collected by the first author near Little Fisher River at an altitude of 820 m (2,690 ft), where it was found in a cool temperate rainforest growing on Atherosperma moschatum. It is locally abundant at this location, where it usually occurs at elevations of more than about 500 m (1,600 ft). The species epithet refers to the genus of the preferred host tree. Within Tasmanian rainforest vegetation, Atherosperma is known for harbouring "a distinctive suite of lichens", including C. atherospermatis.

Coenogonium australiense is a species of corticolous (bark-dwelling), crustose lichen in the family Coenogoniaceae. Found in Australia, it was formally described as a new species in 2018 by lichenologists Gintaras Kantvilas and Robert Lücking. The type specimen was collected by the first author near Little Fisher River (Tasmania) at an altitude of 880 m (2,890 ft), where it was found in a rainforest growing on Nothofagus cunninghamii. The species epithet australiense refers to its geographical distribution. In addition to Tasmania, the lichen has also been documented from New South Wales and Kangaroo Island. In the latter location it was found in remnant stands of coniferous woodland, where it was growing on the bark of old, fissured Callitris trunks.

Pertusaria cerroazulensis is a species of corticolous (bark-dwelling), crustose lichen in the family Pertusariaceae. Found on the Galápagos Islands, it was formally described as a new species in 2015 by Frank Bungartz, Alan W. Archer, Alba Yánez-Ayabaca, and John Elix. The type specimen was collected from the Cerro Azul volcano at an altitude of 1,038 m (3,406 ft), where in a small, shaded woodland, it was growing on twigs of Psidium galapageium. The species epithet refers to the type locality.

References

  1. "Ochrolechia insularis Kantvilas & Elix". Species 2000 & ITIS Catalogue of Life . Species 2000: Naturalis, Leiden, the Netherlands. Retrieved 12 June 2023.
  2. 1 2 3 4 5 6 Lumbsch, H.T.; Ahti, T.; Altermann, S.; De Paz, G.A.; Aptroot, A.; Arup, U.; et al. (2011). "One hundred new species of lichenized fungi: a signature of undiscovered global diversity" (PDF). Phytotaxa. 18 (1): 9–11. doi:10.11646/phytotaxa.18.1.1.
  3. Kantvilas, Gintaras (2018). "South Australian lichens — A Kangaroo Island case study" (PDF). Swainsona. 30: 17–24.