GRAPHIS SCNIPTA - Universitetet i Oslo

Erioderma pedicellatum still present, but highty endangered in
Europe
HATON HOLIEN, GEIR GAARDER ANd ARNODD TIAPNES
Holien, H., Gaarder, G. & H6pnes, A. L995: Erioderma pedicellatum still
present, but highly endangered in Europe. Graphis Scipta 7: 79-84.
Stockholm. ISSN 09AL-7593.
Two specimens of the highly endangered foliose lichen Eioderma
pedicellatum were found in central Nonvay in the summer of L994. The
species has not been recorded in Europe for nearly forty years. A brief survey
of the history of the species as well as some preliminary accounts on its
habitat ecology and associate species are outlined. Its reproductive strategy
and substrate ecology are briefly discussed. Comments on some aspects of
conservation and future prospects of the boreal rain forests of central Nonray
are given.
Hdkon Holien, Department of Botany, Museum of Natural History and
Archaeology, University of Trondheim, N-7004 Trondheim, Norway.
Geir Gaarden Miljpfaglig Utredning ans, Postbolcs 66, N-6630 Tingvoll,
Norway.
Arnodd Hdpnes, Ekkoveien 39, N-1312 Slependen, Norway.
During mapping of old coastal spruce forests
rich in epiphytic lichens (boreal rain forest) in
central Norway in 1994, two of us (GG & AH)
found one specimen each of the highly endangered
foliose lichen Eioderma pedicellatum at
two different sites (Nord-Trondelag county,
Overhalla and Grong municipalities) situated
approximately 30 km from each other in the
Namdalen area. The distance from Grong
centre was about 1"5 and 20 km to the northwest
and northeast respectively. The known
European distribution is set out in Figure 1.
As the species has not been observed in
Nonvay since it was collected in Grong in 1939
(Ahlner L948) it was regarded as extinct in
Nonvay (Jorgensen 1990, Direktoratet for
Naturforvaltning 1992). The last observation
in Europe was made in 1956 in a protected
locality in Viirmland, Sweden (Ingel6g et al.
1987, Databanken f6r hotade arter &
Naturvirdsverket 1991).
The aim of this paper is (1) to report the
species as still being present in Europe, (2) to
give a brief and preliminary account on its
habitat demands, and (3) to point on some
aspects of conseryation regarding the boreal
rain forests of central Noruray.
Brief historical survey
When Ahlner found the Erioderma species at
three different sites near Grong in
Nord-Trondelag in 1938 and L939, he thought
it was a new species, which he described as
Erioderma boreale in his classical thesis on
epiphytic lichens in Fennoscandian coniferous
forest (Ahlner L948). Except in the later discovered
locality in Viirmland, Sweden (Norra
Brattmoviken), the species was recorded as