A detailed description is given of the fossil pollen floras of two lignite seams associated with the Tertiary igneous rocks of Western Scotland. One of the seams occurs at the base of the lava succession at Ardslignish, Ardnamurchan; the other is exposed at two localities, Shiaba and Bremanoir, within the lava succession on the island of Mull.

Seventy-one species belonging to forty-four genera are described. All the species and two of the genera are new. Comparisons are made with modern pollen grains and some close resemblances are noted between the fossil species and species now living in various distant parts of the world, in particular Eastern Asia, Australasia and North America.