Pathogen introduction as a collateral effect of military activity.

489–497). Three papers utilize molecular phylogenetic approaches to systematics. Traditional groupings and most species of Physconia are confirmed as distinct, although doubt is shed on the monophylly of two species pairs (pp. 498–505). The Lecanora rupicola group is shown to be distinct from Lecanora s. str., with the species containing sordidone as well as having pruinose apothecial discs (pp. 506–514). ITS data is used in a revision of the marine Collemopsidium species in north-west Europe, along with statsitical analyses of morphological and habitat variables, leading to the recognition of five species (pp. 515–532). A critical revision of the non-yellow species of Rhizocarpon with hyaline muriform ascospores in the Nordic countries is presented; 16 species are accepted and keyed, along with maps, descriptions, synonyms, spore drawings and habit photographs (pp. 533–570). Finally, a survey of Trichothelium species on bark in the neotropics revealed three new species, bring the known number to five (pp. 571–575). The increased inclusion of lichenological papers in Mycological Research in recent years reflects the continuing integration of lichenologists into the broader mycological community. However, now that The Lichenologist, has a new publisher (Cambridge University Press) and is expected to provide an improved service, Mycological Research will in future give priority to lichen papers which will also be of interest to a wider mycological audience.