Order: Pyrenulales Family: Pyrenulaceae
Species: Pyrenula dermatodes
Photos: On Holly. Co. Cork and Co. Kerry, SW Ireland.
Thallus yellow-green to rusty-orange, superficial, continuous, finely cracked or areolate. Immersed perithecia form very low projections with only grey ostiole visible from above, sometimes exposed with black disc visible. Pseudocyphellae absent. Spores 3-septate, 14-19 x 6.5-7.5(-8.5) Ám. Curved conidia, c. 15 Ám. Micro photos below.
Thallus K+ orange-red (patchy), C-, KC-, P-, UV+ yellow-orange
Usually on smooth-barked trees including Holly, Hazel, Rowan and Beech, rare on shaded siliceous rocks. Can be locally frequent in SW Ireland, range extending up the west coast to Co. Donegal. Also found in N Scotland but not recorded from elsewhere in Europe.