Description: This crustose epiphyte and member of the ‘bark-pimple’ tribe is faithful only to holly, growing in ancient, old-growth woodland. The thallus forms pale grey patches on the lowermost bark, and is sprinkled with 2-15 discs or perithecia crammed together into locules (flat, low, black, tar-like spots, 0.3-0.6mm diam.) reminiscent of Tomasellia gelatinosa (described elsewhere), but less regular in outline. The colourless mature spores are one-septate.

Key Identification Features:

• Discs in tiny irregularly shaped locules, like miniature tar-spots less than 1mm diam.
• Exclusive to holly, mostly occurring near to the foot of the tree; spores colourless.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Mycoporum lacteum at iNaturalist World Species Observations database.