Cytological observations have been made on 155 entities (excluding sterile hybrids) referable provisionally to ca. 140 existing taxa in the fern flora of Ceylon. These have been supplemented by observations on 69 entities (involving 46 additional species) from wild material of ferns from other countries, chiefly Malaya, and on 15 additional species of unknown wild origin growing at Kew. The cytological findings are assembled in relation to the taxonomic system of Copeland (1947) which is discussed in a preliminary way together with the relevant portions of the alternative system of Holttum (1947).

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The indigenous species of Pteridophyta known to occur in Ceylon number 314. In addition, 18 naturalized species occur as weeds of cultivation or as introduced aliens. Fifty-seven species are endemic to Ceylon and 28 non-endemic species are absent from India. Lists of these and other phytogeographical groupings are given. The full list of species is followed by comments on the taxonomy or nomenclature of 76 taxa. Four new combinations are made: Asplcnium pobodon var. bipinnatwn (Sledge) Sledge; Deparia polyrhizon (Baker) Sledge; Polystichwn harpophyllum (Zenker ex Kunze) Sledge, and Bolbitis appendiculata var. asplenlfolia (Bory) Sledge. Athyriwn puncticaulc (Blume) T . Moore and A . lanceum (Kunze) T. Moore replace A . anisopterum Christ and A . macrocarpum (Blume) Beddome, respectively.

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