JDH writes to Sir William Turner Thiselton-Dyer regarding the delineation of the genera Callitris, Widdringtonia alias Pachylepis & Tetraclinis. He regards them as three distinct genera especially on reflection that they are from distinct geographic areas: Australia, South Africa & north Africa respectively. In a post script JDH adds that his work on grasses, including Indian species, is complicated by [Otto] Stapf's work on African grasses & will require JDH to make alterations as he goes.