Hypomyces tulasneanus Plowr. syn. H. luteovirens (Fr.) Tul. & C. Tul. (illustrated 55% life size) Fruit body white then olive-green to dark green mould with dark green perithecia that project as small pimples; covers the gills and stalk of Lactarius and Russula mushrooms. Spores 28–35×4.5–5.5¼, fusiform, 1-celled, finely warted; transparent. Habitat in woods on various species of Russula and Lactarius; summer to autumn. Not edible.