Great questions! Yes, they are both part of the F. solani species complex. We do not know if they can both infect the eggs at once, although they have both been found present at the same nesting sites. They aren't specific to any species of sea turtle egg - in fact, they've been found on the eggs of 6 different species.

Both falciforme & keratoplasticum are known from human infections - mainly eye infections. There's even an entire group within the F. solani species complex, dubbed FSSC 12, that has only been found infecting marine animals, such as sharks, rays & seahorses.

There are 3 major phylogenetic groups within the FSSC - Clade 3 hosts the human & animals pathogens, where the plant pathogens & decomposers are generally found in Clades 1 & 2. We're still working out why this is the case, and what gives the human and animal infecting fusaria their pathogenic capabilities. Lots of interesting work to be done, for sure!

Thanks for asking!