Opegraphaceae Opegrapha niveoatra Growth type crustose Chemical results negative Deciduous trees with basic and neutral bark; Elm, Ash and Sycamore. Host to Laeviomyces opegraphae, pycnidia with brown conidia Thin dull-grey to olive-brown thallus, the small ((0.3-1mm), sessile lirellae simple, curved or stellate. Disc partially exposed with age. Spores 4-7(-8) septate, 20-30 x 2.5-4 µm. Pycnidia abundant, conidia short, curved and worm-like. Microscope photograph below. Similar: Opegrapha vulgata. Larger lirellae, longer, curved conidia.

Microscope photograph



Opegrapha niveoatra
Studland Heath and Broadstone, Dorset. April 2013, November 2023