PZ Myers criticized this here: https://scienceblogs.com/pharyngula/2013/07/02/the-mfap-hypo...

I still like to think that hybridization played a greater role in evolution than we now suppose.

The proponent (Eugene M McCarthy) has some amazing examples of cross-species fertilization but also some pretty crack-potty stuff. His website is http://www.macroevolution.net/