Fig.1.15. Psilotum nudum. A-F, successive stages in the development of embryo; A-E, after Bierhorst and F, after Holloway. Fig.1.15. Psilotum nudum. A-F, successive stages in the development of embryo; A-E, after Bierhorst and F, after Holloway. 2018-07-13 admin