At seasonally wet sites with high base saturation and readily decomposable litter (alder, ash), a Moist L Mull (Figures 10 and 11) develops if the soil is periodically water-saturated up to the surface, which can be deduced from the species of the herb layer indicating recent alternating moist-to-wet conditions and the blackish colour of the organic surface layer. The thickness of the A horizon is generally 10 to 20 cm with an organic carbon content of 8–<15% by weight. The distinct features of a Moist L Mull are:

• Owl horizon is present almost all year round;
• Owlf horizon is present but is patchy and sometimes black smeary leaves are visible and
• hydromorphic features in the A horizon.