Willia calobolax

Common Name(s)


Current Conservation Status

2009 - Threatened - Nationally Critical

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 - DP, RR, ?SO


Willia calobolax (Mull.Hal.) Lightowlers



Flora Category

Non Vascular - Native

Structural Class



Barbula calobolax Müll.Hal.; Tortula pachyneura Dixon; Trichostomum imshaugii (Vitt.) R.H.Zander


Indigenous. Subantarctic. In New Zealand little known. The first record from the country came from fragments isolated from within a collection of Leptostomum inclinans R.Br.ter. made in 1904 by Leonard Cockayne.


Terricolous, loosely tufted moss. Leaves 2.0-2.5 mm long, suberect to spreading when dry or moist; lamina oblong, concave, widely acute or obtuse, sometimes slightly contracted in mid-lamina; margins plane and entire; nerve very stout, c.80 microns wide in central portion of lamina, narrowed at the base, excurrent as a stout, often slightly recurved mucro, red, at the apex corrugated or papillose on the dorsal surface. Upper cells 10-15 microns, irregularly isodiametrical, obscure, densely papillose; cells below 10-15 microns wide and 2-3 x 1, smooth, with rather firm walls, scarcely altered at the margin. Fruit unknown.


Fruits not known


Only known in New Zealand from a few collections, otherwise very poorly known which is why it has been listed as Data Deficient

Endemic Taxon


Endemic Genus


Endemic Family


This page last updated on 25 Jul 2014