An analysis is given of the relationships between the genera of the tribe Cylindroiulini. The situation at present is reviewed first. Various characters are described which are subsequently used in the construction of a cladogram. The result is the splitting of the genus Allajulus Koch into three genera, Allajulus, Cylindroiulus Verhoeff, and Kryphioiulus gen. n., this last genus being erected for occultus C. L. Koch. Use of a computer program, PAUP (phylogenetic analysis using parsimony), in general confirms these divisions. The nominal genera Micromastigoiulus Verhoeff, Dendroiulus Verhoeff, Solaenoiulus Schubart, Olisteroiulus Lohmander are synonymized with Cylindroiulus. The position of the Cylindroiulini within the family Julidae is also discussed and a preliminary phylogeny presented. A key to the genera and species of the tribe Cylindroiulini, omitting species in the genus Cylindroiulus, is given in an appendix.

Five new species of Cylindroiulus are described, Cylindroiulus waldeni, C. xynon, C. ynnox and C. zarcoi from Madeira and C. disjunctus from La Palma, the Canary islands. Some new specimens from the Azores and the Desertas islands are examined. The position of these within the Madeiran Cylindroiulus speeies swarm (the Cylindroiulus madeirae-group) is discussed and the relationship of the madeirae-group as a whole is re-examined.

Biogeochemical signatures were compared in ‘living’ and ‘dead’ Parmelia sulcata samples with their oak bark substratum. Eighteen elements reached maximum concentrations in ‘dead’ lichens, at lower concentrations than reported from industrial regions. High N concentrations in ‘dead’ lichens confirm exceedances of critical levels established for deciduous woodlands, supported by alien algae and ‘nitrophytic’ lichen colonization. Negative δ15N values recorded in lichen samples indicate N originated mainly from ammonia. Less negative δ15N values in healthy samples near busy roads suggest local NOx accumulation by Parmelia. Higher δ15N values in bark may result from different processes. Twenty-eight elements reach higher concentrations in healthy lichens near roads carrying higher traffic volumes. Thirteen elements correlate positively with lichen δ15N, suggesting that δ15N is a powerful indicator of the balance between agricultural and vehicular N influx. Maximum Ca and Sr concentrations recorded in bark and their spatial distribution suggest a local geological origin. High concentrations of Ga, Ba, Pb and Ni bark contents testify to a previous pollution legacy, including that from petrol which carried higher lead concentrations than today. Mn concentrations are higher than reported from other studies and show no clear relationship with local roads. Mn is known to limit lichen diversity and health in coniferous forests in US and Germany, but not yet in deciduous woodlands. Current atmospheric conditions and the former pollution legacy must be understood to conserve epiphytes and for biomonitoring.

No abstract

No abstract