Irish lichens

Arthopyrenia platypyrenia

Order: Incertae sedis       Family: Arthopyreniaceae

Species: Arthopyrenia platypyrenia

Growth type crustose
Photos: On Weigela twig. Co. Cork, SW Ireland.
Identification confirmed by John Douglass

The very inconspicuous non-lichenised thallus has tiny (0.25 - 0.45mm), +/- rounded perithecia which form below an involucrellum. The asci are (4-)8 spored, spores 3-4(-7) septate, (19.5-) 23-27.5 x 8-11 Ám. Micrograph below. Chemical reactions negative

Occurs on bark, especially of Hedera.

Similar: Arthopyrenia subcerasi has persistently 3-septate spores

Arthopyrenia platypyrenia

Microscope photograph
Arthopyrenia platypyrenia
Arthopyrenia platypyrenia . May 2012

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