Phyllida Spore was a famous herbologist and the author of One Thousand Magical Herbs and Fungi (PS5).
Exceptional skills in Herbology, successful author.
"Spore" = English for "reproductive cell of some kinds of plants."
According to paintings visible on the set of Dumbledore's office in the films and at the Wizarding World of Harry Potter theme park, Spore was a past Headmistress of Hogwarts who served in the 1400s. There is no evidence that Rowling was the source of this information.