Irish lichens

Bacidia biatorina

Order: Lecanorales       Family: Ramalinaceae

Species: Bacidia biatorina

Growth type crustose.
Photos: Glengarriff woods, Co. Cork, SW Ireland.
Provisional identification by Andy Acton, needs microscopic confirmation

Thallus granular or granular-isidiate, pale grey-green, upper surface of granules often grey or brown. Apothecia similar to B. laurocerasi but larger (to 1.3mm), orange-brown or black. Spores 9-16(-22) septate, (43-)60-75(-88) x 2.5-3(-4) µm but it is often sterile. Pycnidia rare, pale orange, the conidia curved, 9-16 x 0.5 µm.
Chemical reactions negative.

Rare in Ireland, occurs on trunks of mature deciduous trees (often Oak) in old woods and former parklands.

Similar: Sterile B. rubella has coarser granules, pale upper surface


Bacidia biatorina
Bacidia biatorina April 2010

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