Irish lichens
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Order: Peltigerales Family: Collemataceae
Species: Collema nigrescens Photos: Killarney National Park, Co. Kerry, SW Ireland. Dark olive-green to brown-black lobes, strongly ridged, sometimes with coarsely granular isidia. Apothecia are usually very abundant, the margins sometimes isidiate. Rare in Ireland, few recent records. Occurs on nutrient-rich bark of mature deciduous trees. In the UK occasionally recorded from seepage tracks on coastal rocks. Chemical reactions negative. Similar: Collema subnigrescens, often fertile, isidia absent. Collema furfuraceum, isidiate but discs rare. |
Collema nigrescens November 2009