Pseudocyphellaria

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Pseudocyphellaria
Pseudocyphellaria anthraspis on Vancouver Island, Canada
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Peltigerales
Family: Peltigeraceae
Genus: Pseudocyphellaria
Vain.
(1890)
Type species
Pseudocyphellaria crocata
(L.) Vain. (1898)
Species

See text

Pseudocyphellaria is a

temperate regions, and contains about 170 species.[2] They resemble Lobaria, except that most species of Pseudocyphellaria have conspicuous pseudocyphellae on their lower surface, a characteristic that was once considered unique to this genus.[1] Some species contain pulvinic acid-related pigments; in these species the soredia and pseudocyphellae can be bright yellow.[1]

Taxonomy

Pseudocyphellaria was originally

Nomenclature Committee for Fungi.[5]

The Pseudocyphellaria symbiosis

Many species of Pseudocyphellaria are

cephalodia on the lower surface of the lichen.[1]

Some species of Pseudocyphellaria appear to be able to use either a cyanobacterium or a green algae as their photobiont. DNA tests have shown that the fungal symbionts in P. murrayi (which is in a symbiosis with a cyanobacterium) and P. rufovirescens (which is in a symbiosis with a green alga) are actually the same species.[6] This means that P. murrayi-P. rufovirescens is actually one species of fungus that is capable of forming two very different lichens, one with a cyanobacterium and one with a green alga.[6] Two other possible pairs of Pseudocyphellaria species that may be capable of choosing their photobiont are P. knightii-P. lividofusca, and P. kookeri-P. durietzii.[6]

Ecological significance

Most Pseudocyphellaria grow on trees in coastal areas, from the subtropics to the boreal zones, although some species can occasionally be found growing on mossy rocks or growing inland.[1] Many species of Pseudocyphellaria are restricted to old-growth forests in humid areas, and are therefore threatened by logging.[1] The limited light conditions of dense young forests can severely decrease the growth of Pseudocyphellaria crocata compared to more open, old-growth forests, and the excess of light from clearcuts can also cause damage to the lichen.[7] Because they are often restricted to humid forests in undisturbed areas, species of Pseudocyphellaria are often used as indicators of valuable old growth forests.[1]

Pseudocyphellaria rainierensis is listed as vulnerable in Canada by COSEWIC. Pseudocyphellaria crocata has disappeared from much of Scandinavia,[8] a development that has been partly attributed to an increase in grazing from snails, presumably as a result of global warming.[9] In the areas of Scandinavia where P. crocata is still found, it seems restricted to growing on smaller twigs that are harder for the snails to reach.[9]

Species

Traditional use

Several species of Pseudocyphellaria can be utilized to produce a brown to orange-brown dye,[11] and some of them have been used to dye wool in Britain and Scandinavia.[12] One species of Pseudocyphellaria is used in Madagascar to make a tea used to treat indigestion.[13]

Besides being yellow, pulvinic acid derivatives are highly toxic.[14] Any species of Pseudocyphellaria that has yellow structures probably contains one of these compounds,[1][15] and may be toxic if ingested.

Gallery

  • Pseudocyphellaria corifolia growing in Parque Etnobotanico Omora on Isla Navarino, Chile. This species has brown soralia and black apothecia.
    Pseudocyphellaria corifolia growing in
    Isla Navarino, Chile. This species has brown soralia and black apothecia
    .
  • Pseudocyphellaria granulata growing in Parque Etnobotanico Omora on Isla Navarino, Chile. This species has brilliant yellow soralia.
    Pseudocyphellaria granulata growing in
    Isla Navarino, Chile. This species has brilliant yellow soralia
    .
  • A species of Pseudocyphellaria growing in the Patagonian Andes near Bariloche, Argentina. This species has brilliant yellow soralia.
    A species of Pseudocyphellaria growing in the
    Bariloche, Argentina. This species has brilliant yellow soralia
    .
  • Yellow pseudocyphellea on the underside of a species of Pseudocyphellaria growing near Bariloche, Argentina.
    Yellow pseudocyphellea on the underside of a species of Pseudocyphellaria growing near
    Bariloche
    , Argentina.

References

  1. ^
    ISBN 0-300-08249-5
  2. ISBN 978-0-85199-826-8
    .
  3. ^ Vainio, E.A. (1890). Étude sur la classification naturelle et la morphologie des Lichens du Brésil. Pars prima. Acta Societatis pro Fauna et Flora Fennica (in Latin). Vol. 7. p. 182.
  4. doi:10.1002/tax.606022
    .
  5. doi:10.12705/662.15
    .
  6. ^
    doi:10.1016/0147-5975(91)90002-U
    .
  7. doi:10.1139/X07-048
    .
  8. ^ Tønsberg T., Gauslaa Y., Haugan R., Holien H., Timdal E. 1996. The threatened macrolichens of Norway – 1995. Sommerfeltia, 23: 1–283.
  9. ^
    PMID 18950428
    .
  10. ^ Renner, B.; Galloway, D.J. (1982). "Phycosymbiodemes in Pseudocyphellaria in New Zealand". Mycotaxon. 16 (1): 197–231.
  11. ^ Brough, S. G. 1984. Dye characteristics of British Columbia forest lichens. Syesis 17: 81–94.
  12. ^ Uphof, J. C. T. 1959. Dictionary of Economic Plants. Hafner Publishing Co.: New York.
  13. ^ "Sharnoff, S. D. 1997. Lichens and people". Archived from the original on 2016-05-20. Retrieved 2010-03-06.
  14. doi:10.1016/0031-9422(93)85097-B
    .
  15. ^ Garbarino, J. A., W. Quilhot, M. Piovano, and C. Rubio. 1991. Studies on Chilean lichens. XVIII. Additions to the chemistry of Pseudocyphellaria. Boletin De La Sociedad Chilena De Quimica 36(4): 229-231.

External links

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