i'm pretty sure that in the first book on it, pseudonymously published by Terrence and Dennis Mckenna under the names "O.T. Oss and O.N. Oeric" they talk about how you can harvest mycelia straight. i think it does depend on letting the fungus fully eat the rice media though if you are just going to dry it out and gently crush the mycelia out of the vermiculite medium, unless you want to extract, but from experience, extracting the actives efficiently takes solid lab skills.