Graphidaceae Graphis pulverulenta Growth type crustose Chemical results: Thallus usually K-, rarely K+ brown One of the two most frequent of four species recently separated from Graphis scripta s. lat. It appears to be most frequent in nutrient enriched lowland areas, where it is often found with Graphis scripta s. str. Thallus grey, whitish or pale yellowish-brown with elongate, curved or stellate apothecia with narrow thalline margins. Discs are widely open and covered with grey or white pruina. Asci 8-spored, the spores 7-12(-14) septate, 15-56 × 5-12 µm and constricted at the septa. Lumina usually lentiform (lens-shaped). Micrograph below.

Micrograph

Graphis pulverulenta
Photographs: Poole, Dorset. January 2025