I want to check what biome the player is in but can not seem to find it. I took at look the the BlockLeaves class because of the way they do textures but I can not seem to find how to check players biome.

I remember the GUI showing which biome the player is in, so if you would look at how the gui gets it you could just copy that. EDIT: I ofcourse mean the GUI you get when pressing f3.

Hmmm well the GUI for it will deffinitely not be what I want because that is going to tell me how they draw/make it I do want is how they get the info. Which I am going to try finding.

BiomeGenBase biomegenbase = par2World.getWorldChunkManager().getBiomeGenAt(x, z);

This gives a whole lot of info, what you want is biomegenbase.biomeName

WHen I used what you gave me I actually kept crashing. I made it so it would output the names of the biomes the player was in but it crashed every time its fired.