• Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Dimelaena triseptata Aptroot

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Scientific name
Dimelaena triseptata
Author
Aptroot
Common names
 
IUCN Specialist Group
Lichens
Kingdom
Fungi
Phylum
Ascomycota
Class
Lecanoromycetes
Order
Teloschistales
Family
Caliciaceae
Assessment status
Proposed
Proposed by
André Aptroot
Comments etc.
André Aptroot

Assessment Notes

Taxonomic notes

The species is quite unique within the genus by the 3-septate ascospores.


Why suggested for a Global Red List Assessment?

Dimelaena triseptata is an endemic lichen from Saint Helena. It grows on open soil and is threatened by increasing trampling by tourists and by getting overshadowed by the invasive plant Carpobrotus.
EOO 128 sq km
AOO 12 sq km


Geographic range

Only known from 3 (formerly 4) mid-elevation locations on Saint Helena


Population and Trends

Only known from 3 locations, each consisting of dozens individual thalli, but covering in total not more than one square meter.
One previously known locality disappeared with the building of the airport.
There may be some additional, not yet discovered, localities.

Population Trend: Decreasing


Habitat and Ecology

On gravelly soil in upland desert areas.

Temperate

Threats

With the increasing tourism on Saint Helena as a result of the new airport, this terrestrial lichen risks to get trampled.
Also, its habitat is rapidly diminishing because of the rapid spread of the invasive plant Carpobrotus.

Recreational activitiesNamed species

Conservation Actions

The remaining localities should be protected from trampling, e.g. by a fence, and the invasive Carpobrotus should be eradicated from these locations.

Site/area protection

Research needed

It is possible, but not very probable, that some yet undiscoverd localities exist, elseweher on Saint Helena. They could be looked for by speciaists.

Population size, distribution & trends

Use and Trade

none


Bibliography


Country occurrence

Regional Population and Trends

Country Trend Redlisted