• 1Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Bacidia rosella (Pers.) De Not.

Go to another Suggested Species...

Scientific name
Bacidia rosella
Author
(Pers.) De Not.
Common names
 
IUCN Specialist Group
Lichens
Kingdom
Fungi
Phylum
Ascomycota
Class
Lecanoromycetes
Order
Lecanorales
Family
Ramalinaceae
Assessment status
Pending
Proposed by
Anders Dahlberg
Contributors
Violeta Atienza, Sergio Perez-Ortega, Christoph Scheidegger
Comments etc.
André Aptroot, Anders Dahlberg, Sonia Ravera

Assessment Status Notes

Taxonomic notes


Why suggested for a Global Red List Assessment?

A globally rare species on old deciduous trees. The deterioration of its habitat is caused by human activities. Proposed and data compiled by Göran Thor.

Suggested assessment by proposer: VU on the A criterium (A2bc+3bc+4bc), population decrease 30 (20-50) % over 100 years. When searched for in southernmost Sweden in the 1990’ it was only refound on 20% of the old localities. The situation is the same in most of Europe, especially in the lowland.


Geographic range

Bacidia rosella is widely distributed on deciduous trees in most of Europe except the westernmost part and it also occurs in North Africa. The reports from North America refer to the newly described Bacidia rosellizans.


Population and Trends

The species has decreased rapidly in most of its distribution area and is red-listed in e.g. Austria, Denmark, Germany, Italy, Norway, Sweden and Switzerland.

Population Trend:


Habitat and Ecology

The species is found on old trees of Fagus sylvatica, Acer platanoides, Ulmus spp. and Quercus spp., rarely also on other tree species. The species occurs both in open and closed forests as well as in avenues and church yards. The species is only found on humid localities with long tree continuity.


Threats

Localities with long tree continuity and deciduous trees are decreasing all over Europe. It is most probably also sensitive to air pollution. The Dutch elm disease is a threat for the occurrences on Ulmus spp.


Conservation Actions

Rich localities should be protected and managed in a way that supports the species.


Research needed


Bibliography


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted