Irish lichens

Lasallia pustulata, Rock tripe

Order: Incertae sedis       Family: Umbilicariaceae

Species: Lasallia pustulata

Growth type foliose.
Photos: On coastal rocks. Rock Island, Cork, SW Ireland.

Thallus greyish-beige, +/- white-pruinose when dry, greenish-brown when wet. Upper surface with numerous conspicuous oval pustules. Margins +/- lacerated. Black coralloid isidia. Apothecia very rare.

Can form large colonies on nutrient-rich, acidic, coastal or upland rocks. Most frequent in the extreme SW of Ireland.
Medulla: K-, C+ red, KC+ red, P-, UV-


Lasallia pustulata


Lasallia pustulata, Rock tripe


Lasallia pustulata
Lasallia pustulata. Co. Cork, June 2009

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