On the right, at a lower altitude, is an altocumulus cloud containing supercooled water droplets.
From the newscientist.com
Mamma can form beneath various cloud types, including cirrus, cirrocumulus, altocumulus, altostratus and stratocumulus, where they often appear irregular in shape.
From the newscientist.com
The full technical name of a cloud in this configuration would be altocumulus stratiformis translucidus radiatus, which would identify respectively its genus, species, and two combined varieties.
From the en.wikipedia.org
These varieties are always identifiable for cloud genera and species with variable opacity, including family B altocumulus and altostratus, and family C stratocumulus and stratus.