Mecodium minimum (A. Rich.) Copel.; Hymenophyllum pygmaeum Colenso
Vascular – Native
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.
Current conservation status
The conservation 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). 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.
2012 | Not Threatened
Previous conservation statuses
2009 | Not Threatened
2004 | Not Threatened
Endemic. North, South, Stewart, Chatham, Antipodes, Campbell Auckland Islands. From the upper Kauaeranga Valley (near Thames) and Mt Pirongia south.
Coastal to montane (usually montane in northern part of range). A common species of shaded rock faces, cliffs, overhangs, and boulder and talus slopes - sometimes in places subjected to salt spray. Often in rather open sites and in places that often dry out for protracted periods of time. Very rarely found growing as an epiphyte.
Diminutive, compact, dense turf-forming fern. Rhizomes long-creeping, very slender and thin, much branched and interwoven. Fronds bright emerald green. Stipes 3-8 mm long, very thin; stipes and rachises not winged, glabrous. Laminae round to elliptic, pinnate, 5-15 × 5-10 mm, glabrous. Pinnae in 1-5 pairs, margins prominently toothed. Sori solitary and terminating rachis, pedunculate. Indusial flaps toothed, abaxially spiny. Description adapted from Brownsey & Smith-Dodsworth (2000).
Recognised by its small stature, bright green colour, prominently toothed pinnae, solitary, stalked (pedunculate) sori terminating the rachises, and by the toothed indusial flaps whose outer (abaxial) surfaces are covered in spines.
Minute spores are wind dispersed (Thorsen et al., 2009).
Difficult - should not be removed from the wild.
hymenophyllum: Membranous leaf, from the Greek humen and phullon
Where To Buy
Not commercially available
Fact Sheet Prepared for NZPCN by P.J. de Lange (18 April 2011). Description adapted from Brownsey & Smith-Dodsworth (2000).
References and further reading
Brownsey, P.J.; Smith-Dodsworth, J.C. 2000: New Zealand Ferns and Allied Plants. Auckland, David Bateman
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): Hymenophyllum minimum Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/hymenophyllum-minimum/ (Date website was queried)