Species

Crossidium davidai

Common Name(s)

Moss

Current Conservation Status

2009 - Non Resident Native - Vagrant

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 Critical

Qualifiers

2009 - DP, OL, SO

Authority

Crossidium davidai Catches.

Family

Pottiaceae

Flora Category

Non Vascular - Native

Synonyms

None (first described in 1980)

Distribution

Indigenous. Widespread in Australia. In New Zealand known only from a single site on Banks Peninsula

Features

Moss green when moist, deep olive-brown when dry. Leaves ligulate-obovate, to 1.50-1.90 x 0.50-0.65 mm wide, widest above middle, concave above, with the apex blunt, cucullate or with a small mucro; margin entire, narrowly recurved from apex to near the base; base not sheathing nor decurrent; upper laminal cells with fairly thin walls, hexagonal or polygonal 12-16 µm diameter, each with several crescentic papillae on both sides, the cells in two marginal row smooth and transversely rectangular; lower laminal cell much larger, smooth, rectangular, short and narrow near the margin; nerve ceasing at or just below apex; filaments 1-4 cells high, the cells 9-12 µm long, the terminal cell longer almost globose or ovoid, 20-25 µm diameter, with 4-6 mamillae. Seta 5-8 mm long, pale brown; capsule reddish-brown, slenderly ellipsoid, 2.0-2.3 mm long, nearly 0.5 mm wide, operculum conical, slightly bent, blunt; peristome c. 400 µm high, with a basal membrane c.80 µm tall , bearing 32 teeth, twisted to the right and covered with fine acute papillae; spores 18-22 µm diameter, minutely papillose.

Fruiting

Fruiting had occasionally been observed in New Zealand. However insufficient information exists from which to determine seasonal periodicity.

Threats

Highly threatened because it is known from one small population in a very vulnerable situation

Endemic Taxon

No

Endemic Genus

No

Endemic Family

No


Fact Sheet Prepared for NZPCN by: P.J. de Lange 31 August 2007.

This page last updated on 13 Oct 2011