Skip to content
Main menu
  • Main page
  • Discover
  • Unexpected connections
  • Topics
  • Random article
  • Search
Your library
  • Saved articles
  • Recent discoveries
  • Rabbit-hole trails
Topic areas
  • Computer Science
  • Mathematics
  • Physics
  • Engineering
  • Biology
  • Economics
  • Curiosities
WikiholeDeeper into Wikipedia
EnglishEN
  • Saved
  • History

  • Article text and media come live from Wikipedia via the official MediaWiki API and are available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply. Each article links to its source and revision.
  • WikiHole is an independent project and is not affiliated with the Wikimedia Foundation.
  • How ranking works
  • All topics
  • Reading history
  • Random article
  • MediaWiki API

Caloplaca

  • Article
  • Rabbit hole
  • Read
  • View history
Tools
Actions
  • Read
  • View history
General
  • Recent changes
  • Related articles
  • Random discovery
This article
Reading time
3 min
Topic
Biology
Quality
Start-class
Dated
1860
Views
109 in 14 days
Last edited
6 Jul 2025
Print/export
  • Printable version
In other projects
  • Wikidata item
From Wikipedia, the free encyclopedia
Rabbit hole:
  1. Caloplaca
Caloplaca
Genus of lichen-forming fungi

Caloplaca is a lichen genus comprising a number of distinct species. Members of the genus are commonly called firedot lichen,1 jewel lichen.1 gold lichens, "orange lichens",23 but they are not always orange, as in the case of C. albovariegata.4 The distribution of this lichen genus is worldwide, extending from Antarctica5 to the high Arctic.6 It includes a portion of northern North America and the Russian High Arctic. There are about thirty species of Caloplaca in the flora of the British Isles.7

A new species of Caloplaca, C. obamae, the first species to be named in honor of Barack Obama, was discovered in 2007 on in and published in March 2009.

Santa Rosa Island
California
8

Loading the rest of the article…

Recent changes

Rabbit hole

Where Caloplaca leads. Every connection below has a source: a link in this article, a shared Wikipedia category, or CirrusSearch text similarity. Articles already on your trail are left out.

Contents
  • (Top)
  • Taxonomy
  • Description
  • List of species
  • Gallery
  • References
  • Recent changes
  • Rabbit hole
Contents
Contents7 sections
  • (Top)
  • Taxonomy
  • Description
  • List of species
  • Gallery
  • References
  • Recent changes
  • Rabbit hole
Study aids for Caloplaca

Terminology

firedot lichen
Members of the genus are commonly called firedot lichen, jewel lichen. gold lichens, "orange lichens", but they are not always orange, as in the case of C. albovariegata.
jewel lichen
Members of the genus are commonly called firedot lichen, jewel lichen. gold lichens, "orange lichens", but they are not always orange, as in the case of C. albovariegata.
gold lichens
Members of the genus are commonly called firedot lichen, jewel lichen. gold lichens, "orange lichens", but they are not always orange, as in the case of C. albovariegata.
orange lichens
Members of the genus are commonly called firedot lichen, jewel lichen. gold lichens, "orange lichens", but they are not always orange, as in the case of C. albovariegata.

Terms the article defines in bold, quoted in context.

Categories:
  • Caloplaca
  • Lichen genera
  • Teloschistales genera
  • Taxa named by Theodor Magnus Fries
  • Taxa described in 1860

392 words · 15 references · revision 1299162469 · CC BY-SA 4.0

General
  • Recent changes
  • Related articles
  • Random discovery
This article
Reading time
3 min
Topic
Biology
Quality
Start-class
Dated
1860
Views
109 in 14 days
Last edited
6 Jul 2025

Key concepts

  • Lichen1
  • List of common names of lichen genera1
  • Caloplaca albovariegata1
  • Caloplaca obamae1
  • Barack Obama1
  • Santa Rosa Island, California1
  • California1
  • Glossary of lichen terms6
  • Circumscription (taxonomy)1
  • Theodor Magnus Fries1

The articles this one links to most, weighted towards the introduction.

Print/export
  • Printable version
In other projects
  • Wikidata item

Taxonomy

Caloplaca was circumscribed in 1860 by Theodor Magnus Fries.9

Until relatively recently, Caloplaca was one of the largest genera of lichen-forming fungi, with more than 500 species.10 Since the advent of molecular phylogenetics, the formerly polyphyletic genus has been split into more than 30 smaller, monophyletic genera after many publications by Ukrainian lichenologist Sergey Kondratyuk and colleagues.11121314 Modern taxonomic studies have significantly narrowed the definition of Caloplaca, with many species now placed in other genera. The genus shows close relationships to Leproplaca and Variospora, with many species growing on tree bark.15

Description

Caloplaca is a genus of crustose lichens characterised by their grey to white thallus (main body) and distinctive yellow to orange fruiting bodies (apothecia). Unlike some related genera, the thallus lacks anthraquinone pigments but contains Sedifolia-grey pigment, which turns violet when tested with potassium hydroxide solution (the K spot test).15

The thallus structure includes a protective outer layer (cortex) made of rounded cells. Some species produce reproductive structures called soredia, blastidia or isidia. Like most lichens, Caloplaca contains a green algal partner (photobiont) from the genus Trebouxia.15

The apothecia feature a persistent rim (thalline margin) matching the thallus colour, whilst the central disc (which features the hymenium–the fertile, spore-bearing surface) displays vibrant yellow to orange hues. Internally, the apothecia contain colourless layers and thread-like structures (paraphyses) that may branch and have enlarged tips. The spore-producing sacs (asci) each contain eight colourless, elliptical ascospores divided into two compartments by a septum.15

The genus is distinguished by its chemistry, particularly the presence of parietin (the main secondary metabolite) and smaller amounts of related substances. These anthraquinone compounds occur only in the apothecia, not the thallus.15

List of species

List of Caloplaca species

Gallery

Caloplaca sideritis
Caloplaca sideritis

References

  1. 1Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2
  2. 2USDA Natural Resources Conservation Service Name Search
  3. 3Orange Lichen (Caloplaca), Encyclopedia of Life
  4. 4Plants Profile for Caloplaca (orange lichen), USDA
  5. 5Olech, M. (1993). "Four new species of Caloplaca from Antarctica". The Lichenologist. 25 (3): 261–269. doi:10.1006/lich.1993.1030.
  6. 6Søchting, U.; Olech, M. (2007). "The lichen genus Caloplaca in polar regions". The Lichenologist. 27 (6): 463–471. doi:10.1017/S0024282995000594.
  7. 7Dobson, F.S. (2000). Lichens, an illustrated guide to the British and Irish species (4th ed.). Slough, England: Richmond. ISBN 978-0-85546-315-1.
8
"New Species Of Lichen Named After President Barack Obama". ScienceDaily. 16 April 2009. Retrieved 16 April 2009.
  • 9Fries, T.M. (1860). Lichenes Arctoi Europae Groenlandiaeque hactenus cogniti. p. 218.
  • 10Kirk, Paul M.; Cannon, Paul F.; Minter, David W.; Stalpers, Joost A., eds. (2008). Dictionary of the Fungi. Vol. 10. CAB International. p. 111. ISBN 978-1-84593-933-5.
  • 11Kondratyuk, S.Y.; Jeong, M.-H.; Yu, N.-N.; Kärnefelt, I.; Thell, A.; Elix, J.A.; Kim, J.; Kondratiuk, A.S.; Hur, J.-S. (2014). "A revised taxonomy for the subfamily Caloplacoideae (Teloschistaceae, Ascomycota) based on molecular phylogeny". Acta Botanica Hungarica. 56 (1–2): 93–123. doi:10.1556/abot.56.2014.1-2.10.
  • 12Kondratyuk, S.Y.; Lőkös, L.; J.A., Kim; Kondratiuk, A.S.; Jeong, M.H.; Jang, S.H.; Oh, S.O.; Hur, J.S. (2015). "Three new monotypic genera of the caloplacoid lichens (Teloschistaceae, lichen-forming ascomycetes)". Mycobiology. 43 (3): 195–202. doi:10.5941/MYCO.2015.43.3.195. PMC 4630424. PMID 26539034.
  • 13Kondratyuk, S.Y.; Persson, P.E.; Hansson, M.; Mishra, G.K.; Nayaka, S.; Liu, D.; Hur, J.S.; Thell, A. (2018). "Upretia, a new caloplacoid lichen genus (Teloschistaceae, lichen-forming Ascomycota) from India". Cryptogam Biodiversity and Assessment. 2018: 22–31. doi:10.21756/cab.esp5.
  • 14Kondratyuk, S.Y.; Lőkös, L.; Farkas, E.; Kärnefelt, I.; Thell, A.; Yamamoto, Y.; Hur, J.-S. (2020). "Three new genera of the Teloschistaceae proved by three gene phylogeny" (PDF). Acta Botanica Hungarica. 62 (1–2): 109–136. doi:10.1556/034.62.2020.1-2.7.
  • 15Cannon, P.; Arup, U.; Coppins, B.; Aptroot, A.; Sanderson, N.; Simkin, J.; Yahr, R. (2024). Teloschistales, including Brigantiaea (Brigantiaeaceae), Megalospora (Megalosporaceae) and Amundsenia, Athallia, Blastenia, Calogaya, Caloplaca, Cerothallia, Coppinsiella, Flavoplaca, Gyalolechia, Haloplaca, Huneckia, Kuettlingeria, Leproplaca, Marchantiana, Olegblumea, Polycauliona, Pyrenodesmia, Rufoplaca, Rusavskia, Sanguineodiscus, Scythioria, Solitaria, Squamulea, Teloschistes, Variospora, Xanthocarpia, Xanthomendoza and Xanthoria (Teloschistaceae) (PDF). Revisions of British and Irish Lichens. Vol. 43. p. 24.
  • Created
    24 Feb 2009
    History
    82 edits
    44 contributors
    No edits in the last 30 days
    Last edited
    6 Jul 2025

    82 revisions in total · 44 contributors

    1. 6 Jul 2025, 21:55 UTCProsperosityswitch for image of type species - maculata no longer in genus−4diff
    2. 28 Jun 2025, 20:50 UTCGreenC botMove 2 urls. Wayback Medic 2.5 per WP:URLREQ#usda.gov+2diff
    3. 19 May 2025, 17:57 UTCEsculentamlink to new article−12diff
    4. 13 Feb 2025, 10:05 UTCPolygnotusm§ Description clean up, replaced: feaures → features+1diff
    5. 27 Jan 2025, 04:30 UTCOAbotmOpen access bot: doi updated in citation with #oabot.+17diff
    6. 25 Jan 2025, 01:03 UTCEsculentaadd info & remove stub tag+2,602diff
    7. 5 Nov 2024, 20:33 UTCAManWithNoPlanfix doi.+6diff
    8. 5 Nov 2024, 20:20 UTCCitation botAdded doi-broken-date. | Use this bot. Report bugs. | Suggested by AManWithNoPlan | #UCB_toolbar+28diff

    View full revision history

    Created
    24 Feb 2009
    History
    82 edits
    44 contributors
    No edits in the last 30 days
    Last edited
    6 Jul 2025

    Related articles are unavailable right now.

    Wikipedia is rate limiting us right now. Try again in a minute.