Английская Википедия:Buellia eldridgei

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Buellia eldridgei is a rare species of terricolous (ground-dwelling), crustose lichen in the family Caliciaceae, known to occur only in Queensland, Australia.

Taxonomy

The lichen was formally described by the Australian lichenologist John Elix in 2020. The type specimen was collected from Merigol Station, Andersen Paddock (Queensland), where it was found growing on soil in open woodland on soft mulga sandplain with Eucalyptus populnea and Acacia aneura as the dominant plant vegetation. This species is named in honour of Professor David Eldridge, who collected the type specimen.

Description

The Buellia eldridgei lichen has a crust-like body (Шаблон:Lichengloss) that can either have a cracked, tile-like appearance (Шаблон:Lichengloss) or be almost scale-like (Шаблон:Lichengloss), and can grow up to 10 mm wide. The individual tile-like pieces, or Шаблон:Lichengloss, can be either closely packed or spread apart, each measuring 0.4–1 mm wide. These areoles are rounded and can be either flat or slightly raised (Шаблон:Lichengloss). The top of the thallus has a pale yellow-brown colour and a glossy finish, and it does not have a distinct border (Шаблон:Lichengloss) separating it from the surface it grows on. Inside the thallus, the layer known as the Шаблон:Lichengloss is white and contains calcium oxalate crystals, as indicated by turning positive when treated with sulfuric acid, but it does not change colour when iodine is applied. The cells of the algae living in partnership with the fungus (Шаблон:Lichengloss cells) are relatively small, with a diameter of 7–14 µm.

The fruiting bodies of the lichen, known as Шаблон:Lichengloss, are quite small, ranging from 0.4 to 0.8 mm wide. These structures are Шаблон:Lichengloss, meaning they have a Шаблон:Lichengloss that lacks a Шаблон:Lichengloss. They are either embedded in the thallus or just slightly attached to it, usually one per areole. The disc of the apothecia is black, not powdery (Шаблон:Lichengloss), and can be flat or slightly sunken. The Шаблон:Lichengloss, the rim surrounding the disc, is thick at first and protrudes above the disc, but becomes thinner and levels with the disc as it matures. The outer zone of this rim is dark brown and about 25–30 µm thick, while the inner zone is a paler brown. The layer just above the spore-producing tissue (Шаблон:Lichengloss) is brown and 10–12 µm thick. The supporting tissue beneath the spore-producing tissue (Шаблон:Lichengloss) is brown to dark brown and quite thick, measuring 150–175 µm. The actual spore-producing layer (Шаблон:Lichengloss) is 65–75 µm thick, clear, and not interspersed with particles; the layer just beneath it (Шаблон:Lichengloss) is a pale brown and 20–30 µm thick. The slender, branching structures (Шаблон:Lichengloss) within the hymenium are 2–2.5 µm wide, with brown-capped tips. The spore-producing sacs (Шаблон:Lichengloss) are typical of the Bacidia type and usually contain eight spores. The spores themselves are of the Buellia type, brown, Шаблон:Lichengloss, and measure 11–16 by 6–9 µm. Older spores show constriction at the division, and their outer walls are wrinkled (Шаблон:Lichengloss). No Шаблон:Lichengloss (another type of reproductive structure) were observed in this species. In terms of reactions to standard chemical spot tests, the medulla is K− and Pd− but is C+ (orange) and UV+ (orange), indicating the presence of 6-O-methylarthothelin as the major chemical component and arthothelin as a minor component.

Buellia eldridgei is similar to Buellia dijiana but is distinguished by having shorter Шаблон:Lichengloss, a thinner Шаблон:Lichengloss, and by its distinct chemistry.

Habitat and distribution

At the time of its original publication, Buellia eldridgei was known only from its type collection in the type locality in Queensland, Australia.