I can't get trees to cross breed. I tried with bee houses, industrial apiaries with and without pollination and sieve upgrades. I don't see any mutated leaves, even with the spectacles. I don't get any pollen from the apiaries either, so I can't mutate trees in the mutator.
industrial apiaries also have sieves.. and pollen is a slow go. make sure the trees are close enough to the apiaries, if you cant get it going i'll throw some sieves in mine tonight and give it a go.
I've already use Forestry, and I'm pretty sure this doesn't work here. I did try with industrial apiaries. And since last time, I make a multiblock alveary, still without success (with sieve collector).