Linnaeus is quite possibly the most famous and influential person in the history of botany, which in some ways is quite unfortunate (at least for mycology). Basically, like Nägeli, he felt that the most important animals were those furry cute ones and the most important plants were those that look nice in a corsage. He wasn't much interested in other types of organisms, and he clearly didn't understand them very well, but that didn't stop him from cramming them into his system because, hey, his system had to cover everything. So the fungi had to wait for Fries (and the non-furry animals for Lamarck) before their taxonomy could be put on anything like a rational or productive basis.
The websites below have long, thorough, and excellent articles on him, along with many links to other Linnaeus websites. For a more detailed, technical discussion of his concrete contributions to botany, see Isley.