What's a good tag for describing a many-author series?

What description or tag can people think of to describe this kind of publishing series?

This series that began with one author - who stopped after 2 books.
However the main character or series continued with several different authors. Each new book was published using each author's own name.
So I don't want to use 'corporate author' or corporate series' as a tag.

It's just a small thing, but it's bugging me to find a better tag than my current one of 'same series different author'.

(The books relating to my concern are the old children's Pollyanna books.)

All ideas welcome

The books are listed with different authors, so wouldn't something like "Pollyanna series" do the trick? Or "So&so's Pollyanna series"?

Yep, can tag for this specific series, but wanted to find a perfect publishing tag to also describe the varied series authorship.

Multi-author series?

the broadest tag would be "shared universe" which would cover not only formal series but other joint efforts.

Perfect! and may add interest to the tag cloud :-)
thanks