Pluteus microspermus is a saprotrophic, mushroom-like (agaricoid) fungi in the Section Pluteus. It is often confused with Pluteus concentricus, a species endemic to New Zealand because P. concentricus also has concentric ridges on its cap (pileus). P. microspermus and P. concentricus can be differentiated by microscopy as the spores are different sizes. P. concentricus also has rougher material on its stipe.

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