NZFlora Fife 2014 Fabroniaceae
The Fabroniaceae are a modest-sized family, with representatives occurring on tree trunks and rock in tropical and warm-temperate regions. The pleurocarpous plants are very small, with singly- or weakly-costate leaves, mostly short and smooth laminal cells, and quadrate or oblate cells forming opaque alar groups. The capsules are erect with a non-hypnaceous and mostly single peristome with paired teeth and no endostome. Fabronia is the largest and best-known genus, although estimates of its size vary. Two genera occur in New Zealand: Fabronia and Ischyrodon, each represented here by a single species. Fabronia australis is epiphytic, relatively common, autoicous, and nearly always fruiting. Populations of F. australis with more or less entire leaf margins predominate on the North I. and these tend to have larger spores and wider leaves than more strongly toothed populations. Entire-margined populations are rare on the South I. Such features have been used to delimit infra-specific taxa (or even species) of Fabronia in other parts of its range, but no taxonomic segregates are proposed here. Ischyrodon, a genus restricted to Australasia and South Africa, is a rarer plant in N.Z.; I. lepturus occurs on coastal rocks, is dioicous, and not known to fruit here.
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