The largest thallus sizes of three species of Rhizocarpon (subgenus Rhizocarponi growing at a single site are significantly different. In addition, each species appears to respond differently to local changes in microclimate. Jonas Rockslide, Alberta, Canada, is estimated to be at least 500 yr old, rather than the 100 yr old suggested by other researchers 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... 

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

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...