Description: This bark epiphyte has tiny, dish-like (urceolate), orange-brown discs (0.2-0.3mm diam.) — sometimes more heavily pigmented — and grows on the wound tracks of old field or wayside trees. In Ireland it has a strong eastern distribution from north to south. The concave, rather fruit gum-like discs are immediately recognizable as Gyalecta, but the spindle-shaped, 11- to13-septate spores should confirm it as this species. Both G. truncigena and G. flotowii (both described elsewhere) have muriform spores.

Key Identification Features:

• On the rain or wound tracks of old, field trees with fruit gum-like, orange-brown discs
• Spores, spindle-shaped with 11 to 13 divisions (20-30µm long); some specimens may have an occasional longitudinal division.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Gyalecta derivata at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Gyalecta derivata at iNaturalist World Species Observations database.