That depends on the kind of bacteria you are looking at. Preferably go for wood decaying sites

Wheat Bran is good source of Xylanase enzyme

Garden soil, decaying plant material. Dont forget to use mineral salt medium containing xylan as a sole carbon source for isolation purpose.

Thanks to all

Kindly see the attachment

Basidiomycete fungi are a good source of xylanase, the Indian Agricultural Research Institute has expertise in the cultivation of edible fungi and should be able to help.