[1] These fossils document foraging activities of slender, cell-wide exploratory hyphae; when these hit a source of food, they produced secondary branches that grew back down the original filament, covered themselves with an envelope, and served as pipes to shuttle nutrients to other parts of the organism.

[1] The form genus Ornatifilum was erected by Burgess and Edwards in 1991 to describe tubular fossils retrieved by acid maceration from the late Silurian.

[2] It was originally intended as a form genus, to facilitate stratigraphy and environmental reconstruction; the fossils do not display enough features to classify them confidently, even at a kingdom level.

[4] Fossils originally referred to Tortotubus protuberans represent the mature cords of the fungus, composed of a braid of simple filaments that have merged into one another and formed an outer envelope with a distinctive pustular texture.

[6] A rich diversity of fungi is known from the lower Devonian Rhynie chert, but the previous record is absent.