Cololejeunea appressa
Common names
Liverwort
Biostatus
Native
Current conservation status
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: P.J. de Lange, D. Glenny, K. Frogley, M.A.M. Renner, M. von Konrat, J.J. Engel, C. Reeb and J.R. Rolfe.
Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.
2020 | At Risk – Naturally Uncommon
Category
Non-vascular
Structural class
Liverworts
Detailed description
Corticolous and folicolous. Plants minute, bright yellow green. Leaf lobe ovate, lobule projecting below lobe margin almost completely. Lobe length 310-415 um, cell walls thick (c.2 um), small cell lumen 7-8 um wide, cells somewhat quadrate. Walls thick, 2 mm wide with occasional intermediate thickenings often developed only on one side. At lobe tip marginal cells with both middle of lumen and walls projecting slightly. Marginal cells similar in size to those of lobe or slightly smaller. Ocelli prominent, of 4(-5) cells in a single row, each with a single large oil body filling the lumen. Individually 27-44 x 16-19 um. Stylus not present, leaf base furnished with large, globose cell at the leaf base where it joins the stem. Lobule ovoid to broadly urceolate, 130 x 105 microns. Inner margin of the mouth bearing 2 teeth, one of these 1-2 cells long and on the side away from the keel, the other, unicellular, smaller, triangular, apex sharply pointed. The lobule almost completely offset from the leaf lobe and only overlaps the row of ocelli slightly. Lobule 130 x 105 um.
Distribution
Indigenous. A mainly tropical species common in north-eastern Australia. In New Zealand it is known only from the North Island (Northland (at Unuwhao and Radar Bush, Te Paki) and Waikato (Port Waikato)) and Chatham Islands (Rangiauria/Pitt Island (Waipaua))
Substrate details
Folicolous and corticolous on the leaves of taraire (Beilschmiedia tarairi) and bark of kanono (Coprosma grandifolia) and Chatham Island karamu (Coprosma chathamica)
Threats
Recent field surveys have found Cololejeunea appressa to be a biologically sparse, naturally uncommon and widely distributed species of northern New Zealand and the Chatham Islands
Detailed taxonomy
Genus
Family
Synonyms
None
Endemic taxon
No
Endemic genus
No
Endemic family
No
Ecology
Fruiting
Not observed in New Zealand specimens
Other information
Previous conservation statuses
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: P.J. de Lange, D. Glenny, K. Frogley, M.A.M. Renner, M. von Konrat, J.J. Engel, C. Reeb and J.R. Rolfe.
Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.
2009 | At Risk – Naturally Uncommon | Qualifiers: RR, Sp
2004 | Threatened – Nationally Critical
Referencing and citations
Attribution
Fact Sheet Prepared for NZPCN by: P.J. de Lange November 2009. Description adapted from unpublished notes provided by J.E. Braggins by P.J. de Lange (November 2009).
NZPCN Fact Sheet citation
Please cite as: de Lange, P.J. (Year at time of access): Cololejeunea appressa Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/cololejeunea-appressa/ (Date website was queried)