The WTU Image Collection, hosted by the University of Washington Herbarium, is a vital online resource dedicated to the vascular plants, fungi, and lichenized fungi of Washington state. This comprehensive collection includes thousands of high-quality photographs, along with detailed information on species identification, habitat, and distribution, making it an invaluable tool for botanists, researchers, and enthusiasts alike.

In addition to its extensive image archive, the collection features interactive resources such as plant identification apps for wildflowers in Washington and Idaho, which aid users in identifying over 1,800 species. It has also contributed significant content to the well-regarded field guide "Mushrooms of the Pacific Northwest," showcasing macrofungi found across the region. Users can browse and contribute to the collection, ensuring an evolving database that preserves the rich biodiversity of the Pacific Northwest. The site is frequently updated, and the team encourages collaboration and the sharing of knowledge within the botanical community.