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[[Space Marines|Space Marine]] [[Adeptus Astartes Homeworld|homeworlds]] , planets belonging to the [[Ecclesiarchy]]{{Fn|6}}, and [[Forge World]]s of the [[Adeptus Mechanicus]] do not normally have tithes, and are given the tithe grade [[Aptus Non]], though Space Marines must provide a separate tithe in [[Gene-Seed]] to the Administratum.{{Fn|2a}} Certain worlds which supply large amounts of [[Psyker]]s to the [[League of Black Ships|Black Ships]] of the [[Adeptus Astra Telepathica]] are also known to be exempt from the standard tithe.{{Fn|2b}} However even worlds exempt from the Imperial Tithe are not always exempt from scrutiny or collections. The [[Sisters of Silence]] are known to gather [[Blank]]s from worlds normally immune from the demands of the Tithe.{{Fn|6}}