I'm looking into using large amounts of Metamorphic Taiga stone in a build, and as such, I've set up some Hydroangeas to feed a Marimorphosis in a vanilla Taiga biome so I can collect a lot of Metamorphic stone. According to the lexicon, it should generate more of the stone according to the biome its in, so I thought this would grant me more Tagia stone than any others. Unfortunately I'm getting quite a bit more Forest stone than any others.. This is using the 174th edition of the mod. :P