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Lichen: Pertusaria pseudocorallina

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Name: Pertusaria pseudocorallina (Lilj.) Arnold (1887)

Pertusaria pseudocorralina showing fertile warts; 2 - 7 apothecia per wart.

Pertusaria pseudocoralina showing fertile warts; 2 - 7 apothecia per wart.

Pronunciation: Pertusaria pseudocorallina

Conservation Evaluation: Least Concern
Body Type: Crustose

K positive red

K positive red

Description: The thick or thin thallus is a creamy white colour; generally it is wrinkled and uneven. A distinguishing feature is the tiny peg-like isidia which are generally scattered across the thallus, but are characteristically found in clusters. The isidia look like miniature golf tees.

The peg-like isidia

The peg-like isidia

The tops are reddish brown in colour giving them the appearance of growths of coral. Isidia may fall out leaving tiny craters. If the thallus has a wart-like appearance the warts may be fertile and contain apothecia; between 2 to 7 apothecia per wart. The apothecia disc is small giving them a perithecia-like appearance.

VC Map Pertusaria pseudocorallina

VC Map Pertusaria pseudocorallina

Chemical Tests: K+ blood red, C-, KC+ yellow-red, Pd+ yellow-red, UV-.
Nature Notes: Found in coastal or upland areas in dry and well lit areas on silica rich rocks.
Vice county distribution map: See Map
Link: Map this species on the Lichen Survey
Other species recorded in Ireland:

  • Pertusaria albescens (Huds.) M.Choisy & Werner
  • Pertusaria albescens var. albescens
  • Pertusaria albescens var. corallina (Zahlbr.) J.R.Laundon
  • Pertusaria amara (Ach.) Nyl.
  • Pertusaria amara forma pulvinata (Erichsen) Almb.
  • Pertusaria amarescens Nyl.
  • Pertusaria aspergilla (Ach.) J.R.Laundon
  • Pertusaria chiodectonoides Bagl. ex A.Massal.
  • Pertusaria coccodes (Ach.) Nyl.
  • Pertusaria corallina (L.) Arnold
  • Pertusaria excludens Nyl.
  • Pertusaria flavicans Lamy
  • Pertusaria flavida (DC.) J.R.Laundon
  • Pertusaria hemisphaerica (Flörke) Erichsen
  • Pertusaria hymenea (Ach.) Schaer.
  • Pertusaria lactea (L.) Arnold
  • Pertusaria lactescens Mudd
  • Pertusaria leioplaca DC.
  • Pertusaria melanochlora (DC.) Nyl.
  • Pertusaria monogona Nyl.
  • Pertusaria multipuncta (Turner) Nyl.
  • Pertusaria ophthalmiza (Nyl.) Nyl.
  • Pertusaria pertusa (Weigel) Tuck.
  • Pertusaria polythecia (Taylor) Erichsen
  • Pertusaria pupillaris (Nyl.) Th.Fr.
  • Pertusaria pustulata (Ach.) Duby
  • Pertusaria velata (Turner) Nyl.


Text and images © Paul Whelan, 2009.