*** Varieties ; stratiformis opacity-based: Translucidus ( C < sub > M </ sub > 3 ), perlucidus ( C < sub > M </ sub > 3 or 7 depending on predominant opacity ), opacus ( C < sub > M </ sub > 7 ).
*** Varieties ; stratiformis opacity-based: Translucidus, perlucidus, opacus.
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