Irish lichens

Xanthoria polycarpa
Order: Teloschistales       Family: Teloschistaceae

Species: Xanthoria polycarpa

Growth type foliose
Photos: On urban trees. Dublin and Macroom, Ireland.

Thallus forms small rosettes of orange-yellow to greyish-yellow crenulate lobes with finely divided apices. Abundant apothecia, often completely covering the thallus. Orange-brown discs become contorted, margin sometimes excluded. Isidia and soredia absent. Ascus 8-spored, spores colourless, polarilocular, 11-15 x 6-8 Ám. Microscope photographs below.

Occurs in urban and rural areas on nutrient-rich or high PH bark in angles of twigs, often on Elder. K+ crimson / purple.

Can be confused with immature Xanthoria parientina.


Xanthoria polycarpa

Xanthoria polycarpa

Microscope photographs
Xanthoria polycarpa

Xanthoria polycarpa
Xanthoria polycarpa

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