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Methods S1 Scanning electron microscopy (SEM) of extant specimens.

Methods S2 Transmission electron microscopy (TEM) of extant specimens.

Methods S3 Ultrathin sections.

Methods S4 Replicas

Notes S1 Extant pycnidial conidiomata (pycnidia) of extant lichen-forming ascomycetes.

Notes S2 Melanosphaerites devonicus Grüss (1928): probably a chytridiomycete rather than a pycnidium.