(V-81) Stratocumulus stratiformis perlucidus lacunosus (V-82) Stratocumulus stratiformis opacus lacunosus (V-83) Stratocumulus castellanus lacunosus (V-84) Stratocumulus floccus lacunosus (V-85) Supplementary features Precipitation-based supplementary features Usually associated with species stratiformis and castellanus. Virga Low cloud producing precipitation that evaporates before reaching the ground. Praecipitatio Stratocumulus clouds producing precipitation that reaches the ground. Cloud-based supplementary feature Mamma Stratocumulus with bubble-like protrusions on the underside; usually associated with species castellanus. Genitus mother clouds Stratocumulus cumulogenitus Stratocumulus nimbostratogenitus Stratocumulus cumulonimbogenitus Stratocumulus altostratogenitus Mutatus mother clouds Stratocumulus nimbostratomutatus Stratocumulus altocumulomutatus Stratocumulus stratomutatus Genus cumulus (little vertical extent) Abbreviation: Cu These are fair weather cumuliform clouds of limited convection that do not grow vertically. The vertical height from base to top is generally less than the width of the cloud base. They appear similar to stratocumulus but the elements are generally more detached and less wide at the base. Species Cumulus fractus (V-86) Ragged shreds of cumulus clouds. Cumulus humilis (V-87) "Fair weather clouds" with flat light grey bases and small white domed tops. Varieties Opacity-based varieties None (always opaque except species fractus which is always translucent). Humilis pattern-based variety Cumulus humilis radiatus (V-88) Small cumulus clouds arranged in parallel lines that appear to converge at the horizon. Supplementary features and accessory clouds Not commonly seen with cumulus fractus or humilis. Genitus mother clouds Cumulus stratocumulogenitus Cumulus homogenitus Clouds formed by air-mass convection associated with contained industrial activity. Mutatus mother clouds Cumulus stratocumulomutatus Cumulus stratomutatus Cumulus cataractagenitus Generated by the spray from waterfalls. Genus stratus Abbreviation: St Clouds of the genus stratus form in low horizontal layers having a ragged or uniform base. Ragged stratus often forms in precipitation while more uniform stratus forms in maritime or other moist stable air mass conditions. The latter often produces drizzle. Stratus that touches the Earth's surface is given the common name, fog, rather than a Latin name that applies only to clouds that form and remain aloft in the troposphere. Species Stratus nebulosus Uniform fog-like low cloud. Stratus fractus (V-89) Ragged shreds of stratus clouds usually under base of precipitation clouds. Varieties Nebulosus opacity-based varieties Stratus nebulosus translucidus (V-90) Thin translucent stratus. Stratus nebulosus opacus (V-91) Opaque stratus that obscures the sun or moon. Pattern-based variety undulatus Wavy undulating base. Stratus nebulosus translucidus undulatus (V-92) Stratus nebulosus opacus undulatus (V-93) Varieties are not commonly associated with St species fractus. Supplementary features Precipitation-based supplementary feature Praecipitatio Stratus (usually species