Order: Peltigerales Family: Peltigeraceae
Species: Peltigera horizontalis
Photos: Killarney National Park, Co. Kerry, SW Ireland.
Identified by John Douglass
Can form large patches. Lobes +/- glossy, blue-grey, often tinged brown. Lower surface white becoming darker towards centre. Conspicuous dark brown-black veins with white interstices. Rope-like dark rhizines. Apothecia red-brown, rounded, sometimes broader than long, held +/- horizontally on lobes.
'Old woodland' indicator species found on mossy tree trunks and rocks, rotting logs and stumps. Chemical reactions negative.
Peltigera horizontalis November 2009