This grower is sure of this plant identification.
slow growing succulent plant - good for bottle garden
Adromischus genus. This is a genus of about 26 species of perennial succulents and evergreen sub-shrubs with rounded thin or fat leaves . The flowers are white-pink and will appear in the summer.
The name Adromischus comes from the Greek word "adros" meaning 'thick' and the word "mischos" which means 'stem'.
They are frost tender with a min of 7C. Give them partial shade and very well drained soil. Under glass, grow in sharply drained cactus compost in full light with good ventilation.
Grown for habit and foliage interest.