What are "Swiss" mushrooms?

Referring to this recipe, what are "Swiss" mushrooms? And what variety would you substitute? Thanks.
http://food52.com/recipes...

susan G. April 30, 2012

...also (creatively) called Baby Bella.

Maedl April 30, 2012

I think it means Cremini mushrooms, too--they are the brown button mushrooms, which are easy to find in the grocery store.

hardlikearmour April 30, 2012

I suspect they mean cremini. Any mushroom you like should work instead.

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