Clubs - Guest permission

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How to control Guest access to clubs? For "regular" forums it's done in the Group-setting but I don't see Clubs listed. The club-setting (Open/Public/Closed..) also impact registered users and I just want to block Guests from accessing Clubs.

Any ideas?  

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There is no other club access permission setting than to choose one of the four group types. 

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That wasn't what I expected , so there is no way to restrict an Open or Public group to only forum members? So if we start moving content into these groups content is going to be wide open for indexing and guest access - or if we make it Closed we relay on members finding clubs and join. Hmm.. this will not be as great as we hoped for..