The series of papers which I am undertaking to publish under the general title ofFragmenta Pteridologiaehas the aim of bringing together some fragmentary observations on the taxonomy, nomenclature, geographical distribution and bibliography of some pteridophytes, which I have assembled during the study of the pteridological flora of Ethiopia and Somalia. These observations are published as parts of an independent paper, since they are not so intimately related to the species of that flora as to justify their inclusion in the accounts of theAdumbratio Florae Aethiopicaenow in preparation.