epilithic mosses.    From Wordnet, Princeton University. 

Plants grow in a wide variety of inhospitable substrates including stone, rock (epilithic), recently decomposed stony soils, or sandy soils.    From Wordnik.com.  [Campos Rupestres montane savanna] Reference

Fish species are lake trout, Arctic grayling, round whitefish (Prosopium cylindraceum), burbot, and slimy sculpin (Cottus cognatus), which feed on benthic chironomid larvae and snails, the latter controlling epilithic algae in the lake.    From Wordnik.com.  [Effects of climate change on hydro-ecology of contributing basins in the Arctic] Reference

(A) Relative SWS1 (ultraviolet) opsin expression is higher among Lake Malawi cichlids foraging on phytoplankton, zooplankton, and epilithic algae (phylogenetic ANOVA).    From Wordnik.com.  [PLoS Biology: New Articles] Reference