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Erioderma pedicellatum (Hue) P.M. Jørg.

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Scientific name
Erioderma pedicellatum
(Hue) P.M. Jørg.
Common names
IUCN Specialist Group
Assessment status
Assessment date
IUCN Red List Category
IUCN Red List Criteria
Scheidegger, C. (Lichen Specialist Group)
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


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.


Threatened by forest management and is highly sensitive to atmospheric air pollutants such as acid rain.

Conservation Actions

The status of the areas of some of the largest subpopulations in Newfoundland is still a matter of debate. The habitats of the former Norwegian populations were suggested as nature reserves. The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) has designated the 'Atlantic population' (New Brunswick and Nova Scotia) as Endangered and the 'Boreal population' (Newfoundland) as Special Concern.

Source and Citation

Scheidegger, C. (Lichen Specialist Group) 2003. Erioderma pedicellatum. The IUCN Red List of Threatened Species 2003: e.T43995A10839336. https://dx.doi.org/10.2305/IUCN.UK.2003.RLTS.T43995A10839336.en .Accessed on 2 February 2023

Country occurrence