Porina borreri Porinaceae
Porina borreri

Growth type crustose
Chemical reactions negative.

On rough bark of Oak, Ash and Sycamore, occasional on the smooth bark of old Holly and Beech. BLS conservation evaluation: LC NS

Thallus grey-brown, green-brown or dark olive-black, small black perithecia <0.5mm, one third to half immersed. Involucrellum purplish-brown or brown. Spores 6-7(-8) septate, (23-)28-35(-40) x (3-)4.5-5(-5.5) Ám. Microscope photograph below.

Similar: Porina aenea. Smaller perithecia, spores 3-septate


Porina borreri


Porina borreri

Microscope photograph
Porina borreri
Porina borreri
On Oak. Holton Lee, Dorset. December 2012

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