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

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