Order: Peltigerales Family: Collemataceae
Species: Collema glebulentum
Photos: Among moss on wet upland rock. Doughill mountain, Co. Cork, SW Ireland. Identification confirmed by Brian Coppins
Rosette-forming black or dark olive-green thallus, tightly adpressed to the substrate. The membrane-like lobes are rounded or irregular, +/- deeply lobate. Numerous terete or coralloid isidia can form +/- continuous areolate crust on older lobes. Apothecia are unknown.
Occurs on +/- basic, periodically inundated rocks by upland rivers, lough margins and in seepage tracks. Very local distribution, S and W Ireland. Chemical reactions negative.
Similar: Collema flaccidum and Collema subflaccidum
Collema glebulentum December 2009