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Lichen: Lecanora crenulata

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Lecanora crenulata showing how the apothecia form loosly arrange groups.

Lecanora crenulata showing how the apothecia form loosely arrange groups.

Name: Lecanora crenulata (Dicks.) Hook. (1844)

Lecanora crenulata: note the way the rims of the apothecia are divided into sections.

Lecanora crenulata: note the way the rims of the apothecia are divided into sections.

Pronunciation: Lecanora crenulata

Conservation Evaluation: Least Concern Body Type: Crustosemap-lecanora-crenulata

Description: The thallus is thin and difficult to see as it is frequently immersed in the substrate. When visible it is pale grey and granular and sometimes areolate. The apothecia are small with white rims which have deep indentations dividing them into 5 to 8 segments. Apothecia appear in small groups, but never tightly packed together. The discs are blue-grey pruinose. Spores are ellipsoidal and no lichen substances have been detected. Apothecia range in size from 0.4 mm to 0.7 mm.

Chemical Tests: All reactions negative.

Nature Notes: This is a difficult species to identify and can be confused with Lecanora dispersa; the apothecia of L. dispersa are never pruinose. Found on hard calcareous rocks, often on old walls, it may turn up on mortar and tree bark.

Vice County distribution map of Leacanora crenulata: See Map

Link: Map this species on the Lichen Survey

Other species recorded in Ireland

  • Lecanora achariana A.L.Sm.
  • Lecanora actophila Wedd.
  • Lecanora agardhiana Ach.
  • Lecanora aitema (Ach.) Hepp
  • Lecanora albella (Pers.) Ach.
  • Lecanora albescens (Hoffm.) Branth & Rostr.
  • Lecanora alboflavida Taylor
  • Lecanora andrewii de Lesd.
  • Lecanora argentata (Ach.) Malme
  • Lecanora campestris (Schaer.) Hue
  • Lecanora carpinea (L.) Vain.
  • Lecanora cenisia Ach.
  • Lecanora chlarotera Nyl.
  • Lecanora conferta (Duby ex Fr.) Grognot
  • Lecanora congesta Clauzade & Vezda
  • Lecanora conizaeoides Nyl. ex Cromb.
  • Lecanora crenulata Hook.
  • Lecanora dispersa (Pers.) Sommerf.
  • Lecanora epanora (Ach.) Ach.
  • Lecanora epibryon (Ach.) Ach.
  • Lecanora expallens Ach.
  • Lecanora farinaria Borrer
  • Lecanora fugiens Nyl.
  • Lecanora gangaleoides Nyl.
  • Lecanora helicopis (Wahlenb.) Ach.
  • Lecanora horiza (Ach.) Linds.
  • Lecanora intricata (Ach.) Ach.
  • Lecanora intumescens (Rebent.) Rabenh.
  • Lecanora jamesii J.R.Laundon
  • Lecanora muralis (Schreb.) Rabenh.
  • Lecanora orosthea (Ach.) Ach.
  • Lecanora persimilis (Th.Fr.) Nyl.
  • Lecanora piniperda Körb.
  • Lecanora poliophaea (Wahlenb.) Ach.
  • Lecanora polytropa (Hoffm.) Rabenh.
  • Lecanora praepostera Nyl.
  • Lecanora pulicaris (Pers.) Ach.
  • Lecanora rugosella Zahlbr.
  • Lecanora rupicola (L.) Zahlbr.
  • Lecanora saligna (Schrad.) Zahlbr.
  • Lecanora sambuci (Pers.) Nyl.
  • Lecanora soralifera (Suza) Räsänen
  • Lecanora stenotropa Nyl.
  • Lecanora subcarnea (Lilj.) Ach.
  • Lecanora sulphurea (Hoffm.) Ach.
  • Lecanora symmicta (Ach.) Ach.
  • Lecanora varia (Hoffm.) Ach.

Text and images © Paul Whelan, 2009.