Archidium elatum

Common Name(s)


Current Conservation Status

2009 - Threatened - Nationally Vulnerable

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 - Threatened - Nationally Endangered


2009 - DP, Sp, ?TO


Archidium elatum Dixon et Sainsbury



Flora Category

Non Vascular - Native




Endemic to New Zealand, known from three sites in the North Island (Ahipara, Bay of Islands and Lake Rotomahana) and from one site on the main Chatham (Rekohu) Island (Otauwae Point).


Dark brown-green or yellow-brown tufted moss. Individual plants 7-15 mm tall, stems simple or weakly branched, stem leaves 0.7-1 x 0.25-0.30 mm erecto-patent, spreading, occasionally reduced to bracts below. Plants sterile, archegonia present, antheridia unknown; perichaetium terminal, perichaetial leaves erect to erecto-patent, channelled, 1.3-1.5 x 0.30-0.35 mm, narrowly deltoid, linear-lanceolate or lanceolate, base ovate, apex acute to broadly acuminate, margins plane or recurved, entire, occasionally serrulate; costa broad, flattened, 88 micrometre (69–115 micrometre) wide in median section, filling 1/3 or more of leaf base, subpercurrent to percurrent; median cells firm-walled, varying in shape from quadrate, trapezoidal to tabular or narrowly rhomboidal; mostly tabular to rhomboidal 20-50 x 9-12 micometre, upper cells mostly rhomboidal, reaching 50-70 micrometre along margins, alar and basal cells uniformly quadrate to short-tabular, smaller than median cells, 14-28 x 9-14 micrometre.


Capsules unknown in this species


Kikuyu grass (Pennisetum clandestinum Chiov.) has been identified as a threat and possible cause of extinction at one site. The possibility that A. elatum has been overlooked over large parts of its range must be considered highly likely.

Endemic Taxon


Endemic Genus


Endemic Family



Fact sheet prepared for NZPCN by P.J. de Lange August 2007. Description based on Sainsbury (1955).

References and further reading

Sainsbury, G.O.K. 1955: A Handbook of the New Zealand mosses. Royal Society of New Zealand Bulletin 5: 1-490.

This page last updated on 25 Aug 2013