Irish lichens

Bacidia caligans

Order: Lecanorales       Family: Ramalinaceae

Species: Bacidina caligans (Bacidia caligans)

Growth type crustose
Photos: On mortared wall, Coachford, Co. Cork, SW Ireland.
Identified by John Douglass

Pale green, grey or brownish finely sorediate thallus with discrete soralia and small red-brown or blackish apothecia. Margins often darker or excluded. Spores are 3-7 septate, 24-48(-63) x 1.5-2(2.5)Ám. Pycnidia immersed, conidia curved 29-35 x 1Ám. Microscope photograph below. Thallus reactions negative but hymenium K+ purple

Usually on sheltered calcareous rocks, mortar and cement, less frequent on bark and rabbit droppings

Bacidia caligans

Bacidia caligans

Microscope photograph
Bacidia caligans
Bacidia caligans. April 2012

All images used are copyright. Please contact me if you find errors.