Yellow Umbo is very unique! The first documented Psilocybe Natalensis (known for its anti-inflammatory affects) and Psilocybe Cubensis hybrid originated by Yoshi Amano. This particular variety is P.Natalensis x Jack Frost, an awesome combination featuring egg-looking, pointy caps. Myco Mommas Psilo Scale, rated at 4-5. Please note: All genetics are intended for microscopy and taxonomy purposes only.