Riccardia pseudodendroceros
Common name
Liverwort
Synonyms
None
Family
Aneuraceae
Flora category
Non-vascular – Native
Endemic taxon
Yes
Endemic genus
No
Endemic family
No
Structural class
Liverworts
NVS code
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.
RICPSE
Current conservation status
- Conservation status of New Zealand mosses, 2014 (PDF, 583.87 kB)
The conservation status of 109 New Zealand moss taxa was assessed using the New Zealand Threat Classification System (NZTCS). Four taxa and one undescribed entity that were not included in previous assessments have been added to the list. The conservation status of only two taxa has changed in this assessment. A full list is presented, along with a statistical summary and brief notes on the changes. This list replaces all previous NZTCS lists for mosses. Authors: Jeremy R. Rolfe, Allan J. Fife, Jessica E. Beever, Patrick J. Brownsey and Rodney A. Hitchmough.
- Conservation status of New Zealand hornworts and liverworts, 2014 (PDF, 695.44 kB)
The conservation status of the New Zealand hornwort and liverwort flora is reassessed using the New Zealand Threat Classification System (NZTCS). A full list is presented, along with a statistical summary and brief notes on the most important changes. This list replaces all previous NZTCS lists for New Zealand hornworts and liverworts which previously had been part of a generic bryophyte conservation status assessment that included mosses. Authors: Peter J. de Lange, David Glenny, John Braggins, Matt Renner, Matt von Konrat, John Engel, Catherine Reeb and Jeremy Rolfe.
Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.
2009 | Threatened – Nationally Critical | Qualifiers: DP, OL
Previous conservation status
2004 | Threatened – Nationally Critical
Distribution
Endemic. South Island, Paparoa National Park
Detailed description
Thallus large, narrow, elongated and creping. Growth indeterminate, branching alternate with most of the side branches of limited growth, bi-tripinnate with some quadripinnate lobing, width 1460-1970 microns. Side pinnae extensively winged with secondary one cell thick pinnae frequent; margins of ultimate pinnae upturned, crispate, sinuose. Apices distinctly dissected with lateral apices becoming short side pinnae or new main axis. Mucilage papillae ventral, a few persisting, 58-122 x 10-22 microns. Rhizoids, stolons and gemmae not known. Axis plano-convex with acute winged margins, 265-315 microns thick, internal cell walls thin to slightly thickened. Wing 1-4 cells wide. Epidermal cells gibbous with a blunt rounded apex, tending to be prominent on the ventral surface. Epidermal cells, including marginal cells usually lacking chloroplasts, shallower than the internal cells. Marginal cells not differentiated and the epidermal cell walls not sculptured. Dorsal epidermal cells round to hexagonally elongate 30-74 x 16-30 microns and 20-30 microns deep. Ventral epidermal cells similar, 42-85 x 27-38 microns, 12-36 microns deep. Dorsal subepidermal cells hexagonally elongate, 80-135 x 38-56 microns. Ventral subepidermal cells similar, 115-190 x 39-57 microns. Internal cells 174-305 x 51-68 microns and 27-67 microns deep. Oil bodies: c.25-60% of epidermal cells with 1 oil-body, 7 x 7-9 to 8-9 x 11-13 microns, subepidermal cells with 1-2 oil-bodies, 10-11 x 16 to 11-12(-14) x 19-22 microns.
Fruiting
Fruits not known
Threats
Known only from the type gathering. Exact threats not clear but evidently a very uncommon plant.
Substrate
Alpine. Terricolous at the base of tussock (Chionochloa Zotov) culms.
Attribution
Fact sheet prepared for NZPCN by P.J. de Lange (27 August 2006). Description adapted from Brown & Braggins (1989).
References and further reading
Brown, E.A.; Braggins, J.E. 1989: A revision on the genus Riccardia S.F. Gray in New Zealand with notes on the genus Aneura Dum. Journal of the Hattori Botanical Labratory 66: 1-132.
NZPCN Fact Sheet citation
Please cite as: de Lange, P.J. (Year at time of access): Riccardia pseudodendroceros Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/riccardia-pseudodendroceros/ (Date website was queried)