De verspreiding van Climacium dendroides, Hylocomium splendens, Plagiomnium undulatum, Plagiothecium undulatum en Thamnobryum alopecuroides in Nederland

The distribution of Climacium dendroides, Hylocomium splendens. Plagiomnium undulatum, Plagiothecium undulatum and Thamnobryum alopecuroides in The Netherlands has been mapped, based on reports and collections from before and after 1980. Climacium dendroides is widespread but nowhere common. A strong decline of Hylocomium splendens in the Netherlands is reported. The decline is especially severe in inland woodlands on poorly buffered sandy soil. This decline could be caused by SO2-deposition, which was very high in the period 1950-1970. In the coastal dunes the decline is less pronounced. Here the decline of Hylocomium is probably the result of overgrowing with grasses, caused by several factors, a.o. nitrogen deposition. Plagiomnium undulatum is a common species which is lately more frequently recorded. Plagiothecium undulatum is localy common and has probably increased. Thamnobryum is mainly restricted to dry valleys in forests in S-Limburg and to deciduous forests in the area of the big rivers.