Description: This rare crustose lichen is known only from three collections from Counties Kerry, Cork and Waterford. It requires periodically inundated rocks so grows best on shaded rocks by lakes and rivers. It has a grey-green thallus and brown discs with a darker disc margin. It resembles L. sanguineoatra (described elsewhere) but that species overgrows mosses, not rocks, and has narrower (3-4.5&

371;m wide) spores. In L. ahlesii the spores can range in width from 5-9&

371;m. The hymenium of the disc has blue-violet granules.

Key Identification Features:

• Thallus on rocks (never directly on mosses) subject to periodic immersion, grey-green with flat, brown discs with a darker rim
• Spores between 5 and 9ųm wide; lough margins, rivers.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Bryobilimbia ahlesii at iNaturalist World Species Observations database.