comment from Alan C. Smith
(from "Sempervivums & Jovibarbas" 2. edition 1980)

Brunneifolium (dark form) - We have re-named this form as only one clone is permissible to occupy a single Cultivar name. The new name we have chosen is 'Chocolate'.

A very fine plant having slightly less compact rosettes than Brunneifolium with dark chocolate coloured rosettes. Mr. Hugh Miller verbally mentioned that he received this form from Praeger under S. marmoreum f. brunneifolium No. 2

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addition from me:

S. marmoreum 'Brunneifolium' = S. marmoreum f. brunneifolium - but this botanical name was never accepted by the botanists; so it was renamed like a cultivar;