Lichens growing on moraines at Storbreen and Nigardsbreen, southwest Norway, were investigated. The mean of the five largest thalli is the optimum lichenometric index of the lichens growing in a quadrat of a given size. The variability of this index is closely related to the size of the quadrat, and decreases with increasing sampling area. Rhizocarpon alpicola is much more variable than species within the Section Rhizocarpon, although this may be due to the relatively young R. alpicola populations … Read more... 

Lichenometry represents an extremely useful dating technique in the Arctic. It is most appropriate for exposed rock surfaces, which are abundant in most arctic environments, and on occasion it represents the only suitable technique for estimating the age of a surface. As a result, Iichenometry is being used in an increasing number of arctic studies. Despite this, controversy still surrounds the manner in which individual thalli are measured. The majority of workers measure either the longest axis … Read more... 

The reproducibility oflichen measurements is poor. Errors may arisefrom mismeasurement ofindividual lichen thalli or from failing to locate large thalli. Observers obtained much more consistent results when a quadrat search was repeated. The reproducibility ofRhizocarpon section Rhizocarpon species measurements increases with increasing sample size but the reverse occursfor Rhizocarpon alpicola measurements. Variations in the extent of error occur between different quadrats, but these appear to be … Read more... 

Huilia chungii (Zahlbr.) comb.nov. and H. flavicunda (Ach.) comb. nov. Read more... 

The ontogeny of the fruiting bodies of Baeomyces roseus is investigated and compared to that of Baeomyces rufus. Baeomyces roseus has ascogons with trichogynes similar to those of Baeomyces rufus. In Baeomyces roseus an apothecium is formed on the surface of the thallus horizontalis. Later it is lifted upwards by the podetium. In Baeomyces rufus the podetium arrises prior to the forming of the apothecium. Therefore the genus should be divided into two subgenera - subg. Baeomyces (with B. roseus) … Read more...