Fossil history of fungus host-specificity: Association of conidia of fossil Asterosporium asterospermum with macro- and microremains of Fagus.

Fossil staurosporous conidia almost identical to modern conidia of Asterosporium asterospermum were found from three Central European localities ranging from the Late Oligocene (Germany) to Middle/Late Miocene (Poland). Extant A. asterospermum is strictly host-specific and found only on branches or bark of various Fagus species from Europe, Asia and North America.