- Proposed
- Under Assessment
- Preliminary Assessed
- Assessed
- CRPublished
Erioderma pedicellatum (Hue) P.M. Jørg.
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- Scientific name
- Erioderma pedicellatum
- Author
- (Hue) P.M. Jørg.
- Common names
- IUCN Specialist Group
Lichens- Kingdom
- Fungi
- Phylum
- Ascomycota
- Class
- Lecanoromycetes
- Order
- Peltigerales
- Family
- Pannariaceae
- Assessment status
- Published
- Assessment date
- 2003-04-30
- IUCN Red List Category
- CR
- IUCN Red List Criteria
- A2c+4c
- Assessors
- Scheidegger, C. (Lichen Specialist Group)
- Reviewers
- Wolseley, P.A. & Smith, C. (Lichen Red List Authority)
Assessment Notes
The content on this page is fetched from The IUCN Red List of Threatened Species: https://www.iucnredlist.org/species/43995/10839336
Justification
The generation time of Erioderma pedicellatum is roughly estimated to about 30 years. This is based on several hundred permanent plots established in Newfoundland where single thalli were observed over four years. For the assessment of the Red List status we therefore considered a period of about 100 years (three generations). During this period E. pedicellatum has completely disappeared from New Brunswick (Canada), Norway and Sweden. Populations in Nova Scotia have suffered a major decline (> 95% of the regional population size). Only in Newfoundland has a considerable regional population survived and is under permanent observation by regional forest and conservation authorities, and the Lichen Specialist Group of IUCN. A recent assessment of the Newfoundland population has suggested that this species is threatened based on thallus counts and a documented decline in the regional distribution (local subpopulations and habitat range).The major threats to this species are habitat destruction through logging and air pollution. The decline (considered irreversible) of the global population (i.e., loss of local subpopulations) is > 80%. The area of occupancy for the Newfoundland population is 23.35 km². The number of individuals in the Canadian subpopulation (based on thallus counts during the past five years) is about 5,074 thalli.
Geographic range
Erioderma pedicellatum is an amphi-Atlantic species known from Europe (Norway and Sweden) and Canada (New Brunswick, Nova Scotia and Newfoundland). Today, it is largely restricted to Newfoundland. Fourteen individuals are known from Nova Scotia and 5,060 individuals (thalli) have been documented from Newfoundland. The Newfoundland population comprises 84 localities. Even in the largest local subpopulations E. pedicellatum is a rather rare species and occurs on only a small percentage of suitable trees. In most cases only one thallus of this species is found on a tree.Population and Trends
Grows in low densities.
Population Trend: decreasing
Habitat and Ecology
Erioderma pedicellatum is an epiphytic species with narrow habitat requirements (primarily old growth, highly oceanic coniferous forests). In Sweden and Norway the species grew on twigs of Norway Spruce (Picea abies) in a unique type of temperate rainforest. In Newfoundland this lichen grows predominantly on the trunks of Abies balsamea and rarely on trunks or twigs of Picea mariana.The species has very low growth and reproductive rates.
