number carved in stone covered with lichen 1812

1812 abstract aged anno annum areolate born boss botany britain carved cemetery century chronology clean cleaning close common covered craftsmanship crustose cryptogamia cryptogamic cryptograms date decade died dimelaena discolored domini era etched events funerary geologic geology gerrimander gravestone great growth historical history lepraria leprose lichen lichenology louisiana macrolichen madison masonry mdcccxi millenium neglect neglecta number numerology obscuratum order oreina polsporina president quartzite railroad rhizocarpon rock sandstone simplex spores stone stonework texture textured thalli thallus timestamp ugly unsightly variety war year