Irish lichens

Stigmidium microspilum

Order: Capnodiales       Family: Mycosphaerellaceae

Species: Stigmidium microspilum

Lichenicolous fungus
Photos: On Graphis scripta. Ballingeary, Co. Cork, SW Ireland.

Irregularly shaped greyish-black patches composed of dark brown hyphae are scattered over the host thallus with small clusters of black perithecia at the centre of the larger patches. Asci are 8-spored, spores 1-septate, hyaline but becoming pale brown when over-mature, 14-19 x 4-5 m. Microscope photograph below.

Fairly common on Graphis scripta in humid woodlands in the west of Britain and in Ireland. Possibly also occurs on other Graphis species.

Similar: Arthonia graphidicola also occurs on Graphis scripta.

Stigmidium microspilum

Stigmidium microspilum

Microscope photograph
Stigmidium microspilum
Stigmidium microspilum on Graphis scripta. January 2010

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