Plants and animals of Pointfield

Very large, brown cap reaching 150 mm in diameter, retaining a brown colour when dry; down-curved edge and concave towards centre with distinct umbo; smooth, slightly greasy surface. Gills emarginate; densely packed; pure white. Stem pale with twisted fibrous appearance, significantly shorter than cap diameter in larger individuals.

Spore print cream. Spores strongly amyloid; ovoid, without germ pore and with a strongly granular surface [picture shows the same spores at different focal points]; thick-walled; 7.9-9.7 x 4.8-5.2 um, mean = 8.6 x 5.1 um, N = 20; Qav. 1.7. Differs from M. polioleuca in having larger spores, in growing to a much larger diameter, and in having a more fibrous stem.

In grass underneath oak tree.