The seventh issue of this loose-leaf colour atlas of ectomycorrhizae gives 8 coloured plates, of Boletopsis leucomelaena, Gyrodon lividus, Hydnellum peckii, Phellodon niger, Piceirhiza oleiferans, Scleroderma citrinum, Suillus laricinus and Tricholoma acerbum, together with half-tone photographs of anatomical features, and legends. Also in this issue, extensive additions are given to the glossary, check-lists on morphology, chemical tests, anatomy of the mantels, emanating elements, and cross sections. Keys are given for ectomycorrhizae on Abies, Alnus, Betula, Cyclobalanopsis, Elaeocarpus, Fagus, Picea, Pinus, and Salix. In an appendix a list is given of the plates that have been issued hitherto, and how to arrange them. A synoptic table makes identification of ectomycorrhizae easier. As the series progresses a new binder is necessary, and is supplied at cost with the present issue.