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Adromischus sp. "Hummel's Silver".

The correct nomenclature for this plant is not stabilized yet. Therefore I like this name, because the leaves become grey silver as they get older.

Adromischus marianiae "herrei".

This is the name on the label. But that sulcate leaf suggests some match with A. marianiae "multicolor". 

 

Adromischus sp. (1).

It can match  with A. alstonii forms.

Adromischus marianiae "immaculatus".

This is the name on the label.