Calymperes tenerum

Common Name(s)


Current Conservation Status

2009 - Threatened - Nationally Endangered

Conservation status of New Zealand indigenous vascular plants, 2012
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2012 using the New Zealand Threat Classification System (NZTCS). This report includes a statistical summary and brief notes on changes since 2009 and replaces all previous NZTCS lists for vascular plants. Authors: Peter J. de Lange, Jeremy R. Rolfe, Paul D. Champion, Shannel P. Courtney, Peter B. Heenan, John W. Barkla, Ewen K. Cameron, David A. Norton and Rodney A. Hitchmough. File size: 792KB

Previous Conservation Status

2004 - Data Deficient


2009 - SO


Calymperes tenerum Müll.Hal.



Flora Category

Non Vascular - Native

Structural Class





Tropical (India, Malaysia, Indonesia, Australia (northern Queensland), Pacific Islands (Hawaiian, Fijian, Tonga Group, Cook Islands, Society Islands, Marquesas, New Caledonia). In New Zealand known from three (January 2006, May and November 2008) gatherings from Chatham and Pitt Islands, two (May 2009 and May 2011) gatherings from Raoul Island and two (October 2009, November 2011) gatherings from Te Paki (North Island)


Known in New Zealand from eight gatherings (see Fife & de Lange 2009 and de Lange & Fife (2010) who document five of these). Three of these gatherings come from the Chatham Islands where this moss was found on the bark of Coprosma chathamica, the exposed root plate of Pseudopanax chathamicus, and trunk of Rhopalostylis sapida. On Raoul Island Calymperes was collected in 2009 and then again in 2011 from the bark of Metrosideros kermadecensis. Recently (2009, 2010) Calymperes was discovered in the North Island at Te Paki (Te Huka Bay and Surville Cliffs). At Te Huka Bay it grew threaded through a liverwort (Acrolejeunea securifolia) that was growing on the upper trunk of Metrosideros excelsa. On the Surville Cliffs if grew with Syrrhopodon armatus on the exposed roots of Metrosideros excelsa.


Corticolous at the base of trees. Plants forming dense, soft, extensive tufted mats, dull green above brown below (drying golden yellow). Stems simple, erect, c.10-30 mm tall, sparingly radiculose at the base. Leaves 3.00-3.80 x 0.75 mm, crisped and curled when dry, erect-spreading when moist; lamina ovate-lanceolate, sometimes abnormally so, slightly constricted above the short, broad, lightly clasping base to a broad lingulate point up to 2 mm long; margin entire, plane or slightly inflexed; nerve strong, not tapering upward, c.90 microns wide, convex and very prominent on the back, excurrent into a thick, blunt, scabrous point bearing numerous cylindrical, septate brood-bodies, normal leaves with the nerve only percurrent, only rarely with brood-bodies; basal leaf cells toward the margins in 6-7 rows, small pellucid, short rectangular at the extreme base, gradually becoming quadrate or transversely elongate upward and merging with the dense areolation of the lamina, which is composed of rounded-quadrate thin-walled cells c.7 microns wide, in one layer, lightly papillose on both sides; cancellinae large, short rectangular; c.25 microns wide, thin-walled and hyaline, forming a sharply differentiated group ending abruptly below the top of the leaf base and occupying c.2/3 of its width. Fruit not seen.


Fruit not seen.


Unknown - First recognised for New Zealand from a chance gathering made on Rekohu (Chatham I.) in February 2006. It was later (2008) found on Rangiauria (Pitt Island). In both Chatham Islands sites it is vulnerable to habitat loss. A serious threat there. It has since been found at Te Paki (2009, 2010) in two sites and on Raoul Island (2009, 2011). At all these locations it seems to be very uncommon. Probably this species is naturally uncommon as it is at the world limit of its range in the New Zealand Botanical Region (see Fife & de Lange 2009) however due to deterioration of its habitat on the Chatham Islands, and the over all small population sizes it has recently been listed as "Nationally Endangered" (see Glenny et al. 2011).


Fact sheet and description prepared for NZPCN by P.J. de Lange August 2009.

References and further reading

de Lange, P.J.; Fife, A.J. 2010: Claymperes tenerum in northern New Zealand. Australasian Bryological Newsletter 58: 8.

Fife, A.; de Lange, P. 2009: Calymperes tenerum Müll.Hal. (Calymperaceae) on the Chatham Islands, New Zealand. Australasian Bryological Newsletter 57: 14–16.

Glenny, D.; Fife, A.J.; Brownsey, P.J.; Renner, M.A.M.; Braggins, J.E.; Beever, J.E.; Hitchmough, R. 2011: Threatened and uncommon bryophytes of New Zealand (2010 Revision). New Zealand Journal of Botany 49: 305-327.

This page last updated on 27 Aug 2013