Order: Lecanorales Family: Scoliciosporaceae
Species: Scoliciosporum chlorococcum
Photos: On Acer trunk. Aughinish, Co. Limerick, Ireland.
Identification needs confirming
Widespreading grey-green to blackish-green irregularly granular thallus. Often found sterile but when present the glossy apothecia are reddish-brown to brown-black when wet.
Very pollution tolerant. Common but easily overlooked on damp, shaded, nutrient-rich bark, also on wood and heather stems, rare on rock. Chemical reactions negative.
Similar: S. umbrinum and the green algae Desmococcus
Scoliciosporum chlorococcum December 2009