April 2019 cover
Mushroom-forming fungi (Agaricomycetes) have key roles in ecosystems, such as plant biomass degraders and mycorrhizal mutualists. There are over 21,000 species of mushroom-forming fungi, and they have diverse fruiting-body morphologies. These range from simple and crust-like to highly structured and gilled, such as Mycena interrupta (depicted). Analysis of the global diversity of these fungi reveals intriguing patterns, including a Jurassic explosion of both species number and morphological diversity. Image: Stephen Axford. Cover Design: Tulsi Voralia.