Nyfunn av hvit skogfrue Cephalanthera longifolia i Tysnes, Hordaland, samt litt om artens økologi og skjøtselsbehov

Abstract

Cephalanthera longifolia is redlisted as near threatened (NT) in the Norwegian Red list (2015), and is one oftotally 13 protected orchids in Norway. In South-Western Norway only a few localities with only a few plants of C. longifolia were known until 2014 when a new locality was discovered in the municipality of Tysnes. Here the plants were growing in a steep-sloped South-Western deciduous forest dominated by Quercus, Tilia and Corylus on gneiss and gabbroic rocks. The soil is made up of eroded rock mainly from the gabbro, and the orchids are growing mainly on and under small crags. The field layer where Cephalanthera longifolia grows is mainly dominated by Luzula sylvatica in contrast to other occurences of Cephalanthera longifolia where it more often grows on richer base rich soil. In 2015 more than 350 flowering plants were recorded in this new locality, which makes it one of the largest occurrences of Cephalanthera longifolia in Western Norway and probably also in Norway.