Structural indicators of richness and rarity of epiphytic lichens on Corylus avellana in two different forest types within a nature reserve in south-western Norway

Epiphytic lichens (and some non-lichenized fungi) on 34 coppices (204 stems ) of Corylus avellana were investigated in a 140 ha study area in south-wes tern Norway. A total of 65 species were recorded on a total bark area of 63 m(2). Corylus in broad-leaved deciduous forest supported more species of m acrolichens, and fewer species of microlichens, than Corylus in pine forest . The macrolichen flora of the deciduous forest differed from that of the p ine forest by having a rich flora of species belonging to the Lobarion alli ance. Old Corylus coppices with tall stems (>8 m), large girth (>8 cm diame ter at breast height) and a noticeable cover of macrolichens (> 10% of bark area) supported the highest number of rare species, and overall, species o f macrolichens. More than 50% cover of microlichens indicated richness and rarity of microlichens on Corylus. (C) 2001 The British Lichen Society.