Английская Википедия:Caloplaca pseudocitrina

Содержание

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Caloplaca pseudocitrina, a little-known species of lichen saxicolous (rock-dwelling) lichen in the family Teloschistaceae. Found in southern Tajikistan, it has a Шаблон:Lichengloss (scaley) thallus forming extensive yellow-orange spots. It was formally described as a new species in 2002 by the lichenologists Imomnazar Kudratov and Oleksandr Khodosovtsev.

Taxonomy

Caloplaca pseudocitrina is a part of the Caloplaca citrina species complex, which, at the time its original publication, was had not yet been resolved taxonomically. It is distinguished from Caloplaca citrina (in the broad sense) by its larger Шаблон:Lichengloss coupled with a narrow septum (internal partition). Similar taxa like C. citrina var. arcis, known only in a sterile state, and soil-dwelling relatives C. heterospora and C. tominii, also have narrow spore septa but differ in other morphological aspects.

Description

The thallus of Caloplaca pseudocitrina is Шаблон:Lichengloss, forming expansive spots that can reach several centimetres in diameter. The Шаблон:Lichengloss are yellow-orange, flat to Шаблон:Lichengloss, and range from 0.2 to 2.0 mm in size. These squamules, either solitary or composed of 3–6 microlobes, attach centrally to the Шаблон:Lichengloss with somewhat free margins and are Шаблон:Lichengloss. The cortex is Шаблон:Lichengloss, measuring 18–24 μm in thickness, with cells around 4.8–7.2 μm. Soralia are typically developed at the edges of the squamules, with Шаблон:Lichengloss, yellow-orange soredia measuring 30–50 μm in diameter.

Apothecia in this species are Шаблон:Lichengloss to Шаблон:Lichengloss, ranging from 0.2 to 1.2 mm in width, generally one or two per squamule. The Шаблон:Lichengloss varies from concave to convex, orange in colour, with a yellow-orange margin. The Шаблон:Lichengloss is Шаблон:Lichengloss, thickening from 15 to 20 μm in the centre to 90–110 μm laterally. The Шаблон:Lichengloss is poorly developed. The Шаблон:Lichengloss is yellowish, about 10 μm high. The Шаблон:Lichengloss is hyaline and measures 30–50 μm in height. The hymenium stands 40–60 μm tall. Paraphyses are unbranched to apically branched, 1.8–2.2 μm wide, with apical cells reaching 3.6–4.5 μm in width. Asci contain eight spores each. The Шаблон:Lichengloss is from the green algal genus Trebouxia, with cells measuring 6.0–12.0 μm in diameter.

Habitat and distribution

This species has so far been observed growing on metamorphic limestone in the arid regions of southern Tajikistan at high altitudes, particularly in the Chormagzak pass, "Schirbibi" locality, at an elevation of around Шаблон:Convert.

See also

• List of Caloplaca species