Re: Fern apogamy


>  Are their other cases in which fertile fern hybrids are not apogamous? 

Many. For example, in the North American Cystopteris there are five fertile 
hybrids and three parents. A reticulogram of relationships may be found here:

http://flora.huh.harvard.edu/FloraData/001/Illus/02p/G40020898.gif

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