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Gleichenia inclusisora, a new and uncommon tangle fern from New Zealand

Abstract Gleichenia inclusisora is described here as a new and uncommon fern endemic to New Zealand. Several morphological features readily distinguish G. inclusisora from other Gleichenia species, and in the context of New Zealand species these features include: sori embedded in the lamina; bicolorous, orbicular to ovate, peltate scales on abaxial surfaces of the ultimate segments; glabrous stipes and glabrescent proximal costae; and unpouched and abaxially white ultimate segments. Phylogenetic analyses of New Zealand species using chloroplast DNA sequences support the distinctiveness of G. inclusisora. It is recorded from four disjunct regions, but no extant population is known for one of these. We suggest that G. inclusisora be treated in the threat classification system as Naturally Uncommon, with the Range Restricted qualifier.