Irish lichens

Arthonia radiata

Order: Arthoniales       Family: Arthoniaceae

Species: Arthonia radiata

Growth type crustose.
Photos: Ballingeary area, Co. Cork, SW Ireland.

Immersed small white, pale-grey or olive-brown tinged thallus often surrounded by brown line. Crowded, black, rounded or star-shaped apothecia, not pruinose, only slightly raised. Asci are 8-spored, spores 3-septate, the upper cell not enlarged, 15-20 x 5-7 Ám. Microscope photographs below.

A pioneer species that is very common on smooth-barked shrubs and trees throughout Ireland. Chemical reactions negative.


Arthonia radiata

Arthonia radiata

Arthonia radiata

Micro photographs
Arthonia radiata

Arthonia radiata
Arthonia radiata Ballingeary, Co. Cork. 2009

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