van den Boom, PPG/ Aptroot, A/ van Herk, CM 1996: The lichen flora of megalithic monuments in the Netherlands. - Nova Hedwigia62(1-2): 91-104. [RLL List # 165 / Rec.# 19255] Keywords: AIR POLLUTION/ GRANITE/ MONUMENTS/ NETHERLANDS/ RED LIST/ SILICICOLOUS/ SUBSTRATE/ THREATENED
Abstract: 3 fig. 3 tab. [These siliceous monuments ('hunebedden') provide a unique (for the Netherlands) substrate for lichens. "Several Red List species occur only or almost exclusively on these boulders, including the nearly endemic Lecidea promixta." New to the Netherlands: Endococcus propinquus, Fuscidea praeruptorum, Thelocarpon coccosporum.]