Mushrooms by Spore Print: Color as an ID Feature

What is a spore print?

Leave a cap gill-side down on paper for a few hours, and it drops a dusting of spores. The color of that dust is a stable clue at the species level. Cap color fades and varies, while spore color stays far more reliable.

Why spore color can save a life

Spore color separates families that otherwise look alike. When a pale gilled mushroom drops a white print, that print is a reason to stop and check for an Amanita. The same test splits a pair of parasols. The shaggy parasol drops white spores, and the poisonous green-spored parasol drops green ones, so a print taken before cooking catches the swap.

Purple caps show how little cap color can tell you. The wood blewit prints pale pinkish buff, while webcaps print rusty brown. Some webcaps cause kidney failure, so the print rules out a dangerous group before the cap color can mislead you.

What a print cannot tell you

Spore color narrows the field, and it never names a species by itself. The chanterelle prints pale yellow to cream, and its poisonous double, the Jack O'Lantern, prints cream to pale yellow. The print barely separates them, and the gills do the work instead, with blunt false ridges on the chanterelle and true blade-like gills on the Jack O'Lantern. Some fungi give no usable print at all, since truffles form their spores inside and the chaga conk drops none.

How to use this page

Pick a spore color to see the species that share it and what that color rules in or out. These color groups each have their own guide:

• White: common among edibles, and shared by the deadly Amanitas
• Cream: a pale shade that chanterelles share with their poisonous double
• Brown: several distinct shades, with every gilled member poisonous