number carved in stone covered with lichen 1940

abstract aged altmark american anno annum areolate battle booker born botany broadcasting cemetery century chronology clean cleaning common craftsmanship cryptogamia cryptogamic cryptograms date decade died dimelaena discolored domini dunkirk era events exile finnish food funerary geologic geology germany gravestone historical history japanese kingdom lepraria leprose lichenology macrolichen masonry mcdaniel mcmxl millenium neglect neglecta netherlands norway numerology obscuratum olympics oreina polsporina rationing rhizocarpon rock simplex soviet spores stonework texture thalli thallus timestamp two ugly union united unsightly war world