Mycoporaceae Cyrtidula quercus Growth type crustose Chemical results negative Common, usually occurs on young, smooth Oak twigs, occasional on Hazel. Thallus immersed, sometimes discolouring the bark. Ascomata irregular in outline, with 1-6 locules. Spores becoming submuriform with (3-)4(-5) tranverse septa, (10-)12-18 × 4.5-7 µm. Microscope photographs below. Similar: Cyrtidula hippocastani is rare or overlooked on Aspen, Cyrtidula major is rare on Birch

Microscope photograph







Cyrtidula quercus
On Oak twig. Lilliput, Dorset. February 2020