considered invalid and may be used in place of the author designation of a taxon in such a case (for instance, "Tricholoma amethystinum sensu auct." is an erroneous name for a mushroom which should really be "Lepista personata (Fr.) Cooke").

Qualifiers and contexts

A related usage is in a concept-author citation ("sec. Smith", or "sensu Smith"), indicating that the intended meaning is the one defined by that author. (Here "sec." is an abbreviation of "secundum", meaning "following"

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