a small green plant growing on the slit of rock with mold

algae boulder bryophyta clammy clump cranny damp damped dank dense evergreen flowerless green grow growing growth humid hydrophyte leaves lichen life marble marine mat moist mold moss muggy natural nature niche non outdoor plant rift rock rupture slit small soaked soaking sodden soggy soppy split stone succulent texture thallophytic tree vascular wet