ADUMBRATIO FLORAE AETHIOPICAE

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Abstract
The Ethiopian species of PARKERIACEAE, ADIANTACEAE, and VITTAKIACEAE are seven, viz Ceratopteris thalictroides (L.) Ad. Brongn. (PARKERIACEAE). Adiantum balfourii Bäk., Adiantum philippense L., Adiantum incisum. Forssk., Adiantum capillus-veneris L., Adiantum thalictroides Willd. ex Schlecht. (ADIANTACEAE) and Vittoria volkensii Hieron. (VITTARIACEAE). PARKERIACEAE, ADIANTACEAE, and VITTARIACEAE are recognized as independent families. Their distinctive characteristics are pointed out and their relationship with other families of ferns is discussed. The research on the taxonomy and nomenclature of the species has given interesting results. The type of Ceratopteris thalictroides is the specimen mounted on sheet no. 42 of vol. 3 of HERMANN's herbarium (BM), while that of Ceratopteris siliquosa is mounted on sheet no. 59 of vol. 2 of the same herbarium. The former is the correct name for the species. The place of publication of Adiantum balfourii is established, and Adiantum martinii is confirmed as its synonym. Adiantum incisum is regarded as a species independent of Adiantum caudatum with which has hitherto been confused. Other species of the same group are studied. Adiantum, capillus-gorgonis is regarded as a synonym of Adiantum incisum; Adiantum hirsutum is considered as an independent species. Adiantum ciliatum. Adiantum zollingeri, Adiantum flagelliferum, and Adiantum proliferum are taken into consideration, but they require further study. The typification of Adiantum capillus-veneris is discussed, and the conclusion is reached that the type of this species is specimen 1252.9 of the Linnean herbarium in London. On the basis of the study of type material Adiantum thalictroides and Adiantum poiretii are regarded as two different species. Their distinctive characteristics are pointed out and their geographical distribution is established. After a careful comparison with two isotypes, it is confirmed that the species of Vittoria present in Ethiopia is Vittoria volkensii.

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