This material is part of the Jungle biome in the Signature Series I created for Allegorithmic. I've received a lot of requests to make tutorials available for these materials on my gumroad. It will take me some time to make, but stay tuned for announcements!
Read more about my collaboration with Allegorithmic here:
https://www.allegorithmic.com/blog/substance-source-signature-materials-daniel-thiger