XIV.—The Anatomy and Affinity of certain Rare and Primitive Ferns.

Extract

A number of rare genera of Ferns of somewhat uncertain affinity had recently come to my hands. As they had by previous writers been referred in some degree to a common relationship it seemed well to embody them together in one memoir. As the work proceeded thejustification of this became more apparent, and towards the end of the work the conclusion seemed clear that the suggested affinities were real though not very close.