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(Map updated: 11 August 2009)

This species closely resembles C. holocarpa (described elsewhere) but differs in the thallus and prothallus, both of which are black. The spores in C. atroflava are broad (13–16 x 9–10µm) with a wide septum (5–7µm). It grows mainly on shingle pebbles. In Ireland, there is a record from County Donegal. Material recorded from County Galway is now considered doubtful.

Key characteristics

• A shingle lichen similar to C. holocarpa but with a black warted thallus and black prothallus
• The spores are broad with a very wide septum.

Original text submitted by Vince J. Giavarini