S. andreanum - synonyms

According to Urs Eggli - Sukkulenten Lexikon - Crassulaceae, 2003 Ulmer the species do not exist anymore.

So here are the synonyms for S. andreanum Wale, Quarterly Bull. Alpine Gard. Soc. 9. 116. , 1941:

S. boutignyanum Billot & Gren. (bassionym)
S. tectorum var. andreanum (Wale) Bol. & Vig.
S. tectorum L. var. tectorum - name used today
S. tectorum subsp. boutignyanum (Billot & Gren.) H.Jacob.

There is a big mistake in Sukkulenten Lexikon. The authors of the combinations do not know the original descriptions.
S. boutignyanum is not S. andreanum. S. boutignyanum is the synonym for Sempervivum tectorum var. alpinum. The authors of the description of S. boutignyanum wrote it in the description. The combination S. tectorum subsp. boutignyanum is also wrong.

I think, that the bettest solution is the solution of Bol. a Vig. - Sempervivum tectorum var. andreanum. This solution grasps the relations in the nature. I would not say, that S. andreanum belongs directly under S. tectorum var. tectorum.

There are the pictures of Sempervivum tectorum var. andreanum:

In the nature


And in the collection

Jezour, thank you for the detailed explanation and photos!