Order: Lecanorales       Family: Scoliciosporaceae Species: Scoliciosporum chlorococcum Growth type crustose. Photos: On Acer trunk. Aughinish, Co. Limerick, Ireland. 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