Tylecodon mallei

Taxonomy
Scientific Name
Tylecodon mallei G.Will.
Higher Classification
Dicotyledons
Family
CRASSULACEAE
National Status
Status and Criteria
Vulnerable D2
Assessment Date
2015/05/13
Assessor(s)
L. von Staden
Justification
A rare, range-restricted habitat specialist, known from two locations and potentially threatened by habitat degradation due to overgrazing.
Distribution
Endemism
South African endemic
Provincial distribution
Northern Cape
Range
Southern Richtersveld between Eksteenfontein and Steinkopf.
Habitat and Ecology
Major system
Terrestrial
Major habitats
Kosiesberg Succulent Shrubland
Description
Shaded, sheltered crevices in rocks near hill summits.
Threats
This species occurs in montane areas where the grazing pressure is currently low. However, as rangelands on the plains and closer to settlements are becoming increasingly degraded, herders are starting to move into montane areas in search of better grazing for their livestock. Severe overgrazing has caused a loss of vegetation cover and a decline in succulents dependent on nurse-shrubs elsewhere in the Richtersveld, and could potentially have a negative impact on this species as well. Its preference for rock crevices may offer it some protection against the effects of grazing-related degradation.
Population

A rare and poorly known species, with only two known collections, but also possibly overlooked.


Population trend
Stable
Notes
Van Jaarsveld and Koutnik (2004) considers this species synonymous with Tylecodon bayeri, however, Bruyns in Snijman (2013) recognises it as a distinct species.
Assessment History
Taxon assessed
Status and Criteria
Citation/Red List version
Tylecodon mallei G.Will.VU D22015.1
Tylecodon mallei G.Will.Least Concern Raimondo et al. (2009)
Bibliography

Raimondo, D., von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. and Manyama, P.A. 2009. Red List of South African Plants. Strelitzia 25. South African National Biodiversity Institute, Pretoria.


Snijman, D.A. 2013. Plants of the Greater Cape Floristic Region 2: The extra Cape flora. Strelitzia 30. South African National Biodiversity Institute, Pretoria.


Williamson, G. 1995. Two new Tylecodon species (Crassulaceae) from the southern Namib Desert (Namibia) and the Richtersveld (Cape Province, Republic of South Africa). Cactus and Succulent Journal (USA) 67(2):114-118.


Citation
von Staden, L. 2015. Tylecodon mallei G.Will. National Assessment: Red List of South African Plants version 2017.1. Accessed on 2019/08/20

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Distribution map


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