Is this a Mammatus cloud

[James Davies]

I would really love some help identifying the name of this beautiful gathering of clouds

I’m hoping I’m right in thinking these are classed as Mammatus clouds 

[Sarah Sturgis]

James,

What a spectacular photo, no matter what the cloud formation is.  The background sky transitions from light to dark, so, at the horizon, the clouds appear dark against the lighter sky.  At the top, the clouds appear lighter than the saturated dark blue background. Lovely. There is a roundish look, an optical illusion, I think, that suggests mamma.

The cloud formation looks like altocumulus floccus, to me.

[Author]

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