Английская Википедия:Collema

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Шаблон:Short description Шаблон:Automatic taxobox

Collema (jelly lichen) is a genus of lichens in the family Collemataceae.[1] The photobiont is the cyanobacterium genus Nostoc.[2] Species in this genus typically grow on nutrient-rich bark or somewhat siliceous or calcareous rocks in humid environments.[3]

Description

Collema lichens are characterized by their medium to large size, with a diameter of Шаблон:Convert. They have a leaf-like, membranous structure that does not swell noticeably when wet. The upper surface of the thallus is dark olive-green to brown-black and is not hairy. The Шаблон:Lichengloss are 2 to 15 mm broad, rounded, and usually flat or partially raised, with smooth or Шаблон:Lichengloss surfaces adorned with elongated ridges or folds.[3]

Both upper and lower Шаблон:Lichengloss are absent in Collema, and the photobiont Nostoc forms chains of cells throughout the thallus without creating a separate Шаблон:Lichengloss. Isidia can be present or absent, while soredia are not found in this genus. The reproductive structures, known as apothecia, have a pale brown to red-brown Шаблон:Lichengloss that can be flat or convex. The Шаблон:Lichengloss is whole and sometimes displays isidia.[3]

The Шаблон:Lichengloss consists of cells that can be either uniformly sized or elongated. The Шаблон:Lichengloss is indistinct and can be colourless or pigmented, while the hymenium is colorless and turns blue when treated with iodine. A more or less colourless Шаблон:Lichengloss is also present. The Шаблон:Lichengloss comprises paraphyses that separate in a solution of potassium hydroxide and may be unbranched or branched, often connecting near their tips, which can be club-shaped or round and exhibit a yellowish to reddish-brown hue.[3]

The asci are club-shaped (clavate) with a strongly thickened apex, and both the Шаблон:Lichengloss and the downwardly projecting annulus and apical cap react blue to iodine. Each ascus produces eight spores that are narrowly ellipsoidal to spindle-shaped or nearly cylindrical with transverse septa. Шаблон:Lichengloss, or Шаблон:Lichengloss, are immersed within the thallus and can be located on the margins or lamina with a pale ostiole. The Шаблон:Lichengloss are rod-shaped with a slightly enlarged apex. No lichen products have been detected in Collema using thin-layer chromatography.[3]

Species

Шаблон:As of, Species Fungorum (in the Catalogue of Life) accepts 24 species of Collema.[1]

Файл:Collema subconveniens 1272916.jpg
Collema subconveniens
Файл:Collema subflaccidum Degel 408008.jpg
Collema subflaccidum

References

Шаблон:Reflist

Шаблон:Taxonbar Шаблон:Authority control

  1. 1,0 1,1 Ошибка цитирования Неверный тег <ref>; для сносок CoL не указан текст
  2. Dobson, F.S. (2000) Lichens, an illustrated guide to the British and Irish species. 4th edition. Richmond publishing Co., Slough, England.
  3. 3,0 3,1 3,2 3,3 3,4 Ошибка цитирования Неверный тег <ref>; для сносок Cannon et al. 2020 не указан текст
  4. Ошибка цитирования Неверный тег <ref>; для сносок Nylander 1868 не указан текст
  5. Ошибка цитирования Неверный тег <ref>; для сносок Spribille et al. 2009 не указан текст
  6. Ошибка цитирования Неверный тег <ref>; для сносок Nylander 1858 не указан текст
  7. Ошибка цитирования Неверный тег <ref>; для сносок Nylander 1863 не указан текст
  8. Ошибка цитирования Неверный тег <ref>; для сносок Tuckerman 1864 не указан текст
  9. Ошибка цитирования Неверный тег <ref>; для сносок Liu & Wei 2003 не указан текст
  10. Ошибка цитирования Неверный тег <ref>; для сносок Degelius 1974 не указан текст
  11. Ошибка цитирования Неверный тег <ref>; для сносок Degelius 1954 не указан текст