Cyatheaceae Cyathea dealbata Swartz Queen Charlotte Sound 57 n = 69 Cyathea colensoi (Hook. f.) Domin. Arthurs Pass 94 n = 69 Cyathea smithii (Hook.) Domin. Kaituna 29 n = 69 Davalliaceae Arthropteris tenella (Forst. f.) J. Smith Nelson 108 n = ca. 42 Aspidiaceae Polystichum richardi (Hook.) J. Smith Lyttelton, Port Hills 7 n = 82 Polystichum cystostegia (Hook.) J. B. Armst. Porters Pass 144 n = 82 Rumohra adiantiformis (Forst. f.) Ching Westport 62 n = 41 Rumohra hispida (Sw.) Copeland North Westland 142 n = 41 Ctenitis glabella (A. Cunn.) Copeland Stewart Island 114 n = 82 Ctenitis velutina (A. Rich.) Copeland Queen Charlotte Sound 47 n = 41 Cystopteris fragilis Bernh. Cass 125 n = 84 Athyrium australe (R. Br.) Presl. Waitomo 175 n = 123 Aspleniaceae Asplenium flabellifolium Cav. Lyttelton, Port Hills 6 n = ca. 270 Asplenium obtusatum Forst. f. Stewart Island 115 n = 72 Asplenium lucidum Forst. f. Queen Charlotte Sound 48 n = 72 Asplenium lucidum var. lyallii Hook. f. Lyttelton, Port Hills 150 n = 144 Asplenium anomodum Col. Weka Pass 122 n = 144 Asplenium colensoi Col. Akaroa 132 n = 72 Pleurosorus rutifolius (R. Br.) Fée Lyttelton, Port Hills 112 n = 72 Polypodiaceae Microsorium pustulatum (Forst. f.) Copeland Queen Charlotte Sound 60 n = 37 Grammitis billardieri Willd. Lyttelton, Port Hills 20 n = 37 Grammitis pumila Armstr. Porters Pass 133 n = 37 Anarthropteris dictyopteris (Mett.) Copeland Queen Charlotte Sound 59 n = 37 Ctenopteris heterophylla (Labill.) Tindale Bluff 120 n = 37 Notes on the Families Ophioglossaceae Like other species of the genus the New Zealand Ophioglossum coriaceum cannot be counted with accuracy, the figure n = 360 being only very approximate. On the basis of figures given by Manton and Sledge (1954) this species would be hexaploid. Botrychium australe is in accord with figures for European, Ceylon and North American species of the genus and may be described as diploid. Osmundaceae As was to be expected, wild material of the two species of Leptopteris is typical of the family, and examination merely confirmed the figures given by Manton (1950) for plants grown at Kew. Gleicheniaceae The two genera examined show no relationship to one another either in chromosome number or in chromosome size. Individual bivalents of Gleichenia circinata are several times larger than those of Sticherus cunninghamii. No accurate count has yet been obtained from the local Dicranopteris linearis, but the chromosomes of this fern are similar in size to those of Sticherus. Hymenophyllaceae (Figs. 1, 3) This family is probably one of the most interesting groups in New Zealand from the viewpoint of cyto-taxonomy. Most interest centres in the species placed in Hymenophyllum and Meringium by Copeland. Meringium multifidum has n = 26 (Brownlie, 1954), and thus is the only New Zealand species showing similarity with