Yes, mushrooms. Fungi, which according to my dictionary includes mushrooms, toadstools and moulds. "28,000 samples of fungi that represent 6,000 species - many of which are quite rare - are housed at the Venice Museum of Natural History [part of the Musei Civici Veneziani], a partner with UC Berkeley for this ambitious project. The collection also is one of the largest in Europe." The samples are going to be used to build a huge DNA database, which will be used for research into plant diseases, forests, etc. The project is expected to be finished by the end of next year.
Here's a link to an article about the collection.