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  4. Cyclosorus interruptus

Cyclosorus interruptus

Cyclosorus interruptus at Tokerau Beach, Karikari Peninsula.<br>Photographer: Bill Campbell, Date taken: 03/03/2008, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
A photo by R.J. Stanley (2003).<br>Photographer: Unknown, Licence: All rights reserved.
Photo by John Smith-Dodsworth.<br>Photographer: John Smith-Dodsworth, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
In cultivation.<br>Photographer: Jeremy R. Rolfe, Date taken: 19/10/2007, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
In cultivation.<br>Photographer: Jeremy R. Rolfe, Date taken: 19/10/2007, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Cyclosorus interruptus at Tokerau Beach.<br>Photographer: Bill Campbell, Date taken: 09/09/2007, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Cyclosorus interruptus habitat at Tokerau Beach.<br>Photographer: Bill Campbell, Date taken: 09/09/2007, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Cyclosorus interruptus in raupo wetland at Tokerau Beach.<br>Photographer: Bill Campbell, Date taken: 03/03/2008, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
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Synonyms

Many including Pteris interrupta Willd., Thelypteris interrupta (Willd.) Iwatsuki, Nephrodium propinquum R.Br., Nephrodium inaequilaterum Colenso, Nephrodium unitum R.Br., Cyclosorus gongyloides (Schkuhr) Link; Dryopteris gongylodes var. glabra (Mett.) Domin; Dryopteris gongylodes sensu Cheeseman

Family

Thelypteridaceae

Authority

Cyclosorus interruptus (Willd.) H.Itô

Flora category

Vascular – Native

Endemic taxon

No

Endemic genus

No

Endemic family

No

Structural class

Ferns

NVS code

The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.

CYCINT

Chromosome number

2n = 72

Current conservation status

  • Conservation status of New Zealand indigenous vascular plants, 2017

The threat classification status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2017 using the New Zealand Threat Classification System (NZTCS) – more information about this can be found on the NZTCS website This report includes a statistical summary and brief notes on changes since 2012 and replaces all previous NZTCS lists for vascular plants. Authors: By Peter J. de Lange, Jeremy R. Rolfe, John W. Barkla, Shannel P. Courtney, Paul D. Champion, Leon R. Perrie, Sarah M. Beadel, Kerry A. Ford, Ilse Breitwieser, Ines Schönberger, Rowan Hindmarsh-Walls, Peter B. Heenan and Kate Ladley. Please note, threat classifications are often suggested by authors when publications fall between NZTCS assessment periods – a suggested threat classification status has not been assessed by the NZTCS panel.

Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.

2017 | At Risk – Declining | Qualifiers: RR, SO

Previous conservation statuses

2012 | At Risk – Declining | Qualifiers: SO

2009 | At Risk – Declining | Qualifiers: SO

2004 | Gradual Decline

Distribution

Indigenous: North Island, from Te Paki to Kawhia Harbour, the Bay of Plenty (including Mayor Island), the Rotorua Lakes to Taupo and near East Cape. Also known from Australia and throughout the tropical and warm-temperate Pacific where it is not threatened.

Habitat

A species of geothermal habitats, and frost-free, coastal and lowland wetlands, especially those dominated by raupo (Typha orientalis) and swamp millet grass (Isachne globosa).

Wetland plant indicator status rating

Information derived from the revised national wetland plant list prepared to assist councils in delineating and monitoring wetlands (Clarkson et al., 2021 Manaaki Whenua – Landcare Research Contract Report LC3975 for Hawke’s Bay Regional Council). The national plant list categorises plants by the extent to which they are found in wetlands and not ‘drylands’. The indicator status ratings are OBL (obligate wetland), FACW (facultative wetland), FAC (facultative), FACU (facultative upland), and UPL (obligate upland).

OBL: Obligate Wetland

Almost always is a hydrophyte, rarely in uplands (non-wetlands).

Features

A creeping fern with harsh, hairless, olive-green fronds to 800 mm long. Frond stalks are slender, up to 600 mm long by 5 mm wide, almost black at the base but becoming brownish. Frond leaflets (pinnae) occur in 9–15 pairs, the basal pair are larger and sickle-shaped with each successive pair becoming shorter. The spores are found in closely packed sori distributed nearer the midrib than the leaflet edge.

Similar taxa

Could only be confused with Pneumatopteris pennigera with which it sometimes grows. However, this species has longer, narrower pale green, soft hairy fronds of even length and shape that wilt easily. Pneumatopteris pennigera also occupies different habitats, being found on stream-banks in kahikatea remnants, and on shaded limestone overhangs and cave entrances.

Flowering

Spore bearing fronds may be found throughout the year

Flower colours

No flowers

Fruiting

Spore bearing fronds may be found throughout the year

Life cycle

Minute spores are wind dispersed (Thorsen et al., 2009).

Propagation technique

Easily grown from division of whole plants. Can be grown from fresh spore. Frost tender, and does best in damp or waterlogged ground.

Threats

Drainage, land development and fern collectors.

Etymology

interruptus: Interrupted in some way

Where To Buy

Sold by a few specialist native plant nurseries. Not widely grown.

Attribution

Fact sheet prepared by P.J. de Lange for NZPCN (1 June 2013)

References and further reading

Thorsen, M. J.; Dickinson, K. J. M.; Seddon, P. J. 2009. Seed dispersal systems in the New Zealand flora. Perspectives in Plant Ecology, Evolution and Systematics 11: 285-309

NZPCN Fact Sheet citation

Please cite as: de Lange, P.J. (Year at time of access): Cyclosorus interruptus Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/cyclosorus-interruptus/ (Date website was queried)

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