Classification
 Subordinate Taxa
 Nomenclature
Scientific Name:
Cyclosorus Link, Hort. Reg. Bot. Berol. 2, 128 (1833)
Type Taxon:
Cyclosorus gongylodes (Schkuhr) Link
Etymology:
From the Greek kuklos ( a circle), a reference to the shape of the sorus.
 Description

Terrestrial ferns. Rhizomes long-creeping, scaly. Rhizome scales narrowly to broadly ovate, setiferous (not NZ) or entire (NZ). Fronds monomorphic. Stipes scaly, minutely hairy or glabrous. Laminae 1-pinnate, coriaceous, lower pinnae not reduced in size; basal pinnae not conspicuously auricled; aerophores lacking; abaxial surface of laminae bearing scales on costae, bearing acicular and short capitate hairs on the lamina surfaces or glabrous, and bearing spherical red or orange glands on the costae. One or more basal veins from adjacent pinna lobes always uniting below the sinus. Sori round, indusiate; paraphyses absent. Indusia reniform, bearing acicular hairs. Sporangia lacking glands or hairs near the annulus, but bearing a multicellular hair with a terminal spherical red or orange gland on the stalk. Spores monolete, finely and irregularly spinulose.

 Taxonomy

Allan (1961) included all New Zealand species of Thelypteridaceae within a broadly construed Thelypteris. Holttum (1971) distinguished Cyclosorus as a genus with long-creeping rhizomes, the basal pinnae not reduced, thin flat scales present on the lower surface of the costae, and spherical glands present on the lower surface of the veins and at the ends of multicellular hairs on the stalks of the sporangia. Smith et al. (2006) interpreted Cyclosorus much more broadly to include many of Holttum’s genera, including Christella and Pneumatopteris, but Holttum’s classification is followed here for consistency (see Taxonomy under Thelypteridaceae).

 Distribution

A pantropical genus of possibly 2–4 poorly distinguished species (Smith 1990). One species in Australia (Bostock 1998) and the Pacific (Holttum 1977). One species in New Zealand; none endemic.

 Biostatus
Indigenous (Non-endemic)
Number of species in New Zealand within Cyclosorus Link
CategoryNumber
Indigenous (Non-endemic)1
Total1
 Cytology

The base chromosome number in Cyclosorus is x = 36 (Holttum 1971; Smith 1990).

 Bibliography
Bostock, P.D. 1998: Thelypteridaceae. In: Flora of Australia. Vol. 48. 327–358.
Holttum, R.E. 1971: Studies in the family Thelypteridaceae III: a new system of genera in the Old World. Blumea 19: 17–52.
Holttum, R.E. 1977: The family Thelypteridaceae in the Pacific and Australasia. Allertonia 1: 169–234.
Kramer, K.U.; Green, P.S. 1990: Pteridophytes and gymnosperms. Kubitzki, K. (ed.) The Families and Genera of Vascular Plants. Vol. 1. Springer-Verlag, Berlin.
Link, J.H.F. 1833: Hortus Regius Botanicus Berolinensis. Vol. 2. Reimer, Berlin.
Smith, A.R. 1990: Thelypteridaceae. In: Kramer, K.U.; Green, P.S. Pteridophytes and gymnosperms. Vol. 1. In: Kubitzki, K. (ed.) The Families and Genera of Vascular Plants. Springer-Verlag, Berlin. 263–272.
Smith, A.R.; Pryer, K.M.; Schuettpelz, E.; Korall, P.; Schneider, H.; Wolf, P.G. 2006: A classification for extant ferns. Taxon 55(3): 705–731.