Tuberous polypore / Spring / Summer / Autumn / Winter / Edible

The Tuberous Polypore (Polyporus tuberaster) is a delightful find for me. Known for its edible qualities and distinctive growth habit, this mushroom grows from an underground sclerotium—a hard, tuber-like structure that gives it its name. Found on dead or decaying hardwood, this polypore’s creamy caps and tough, fibrous stem make it stand out during foraging trips.

While its texture may not suit every palate, the Tuberous Polypore is a versatile mushroom that can be cooked in various ways, often adding a unique, earthy flavour to dishes.

In this post, we’ll explore how to identify the Tuberous Polypore, where to find it, and tips for preparing it in the kitchen.

Scientific Name

Polyporus tuberster

Common Name

Tuberous polypore

Family

Polyporaceae

Habitat and season

Saprophytic grows on fallen branches of deciduous trees, especially beech

Appears in summer and autumn.

Uncommon find 

Identifying Features of Tuberous polypore

This is a med/small polypore fungus that grows directly off wood which also may be buried, usually present as a single fruiting body. 

Upperside/ cap

5-10 cm across, 

Shape can vary a little – from rounded either as a slight or deep funnel shape or with the stem off center making it more of a kidney or fan shape. 

Cream with beige/light brown scales that are concentrically zoned ( radial circles) the cap margin is often in-rolled. 

Underside

Polypore- lots of tiny holes like sponge. Cream and angular, resembling netting that has been pulled more in one direction. The pores are decurrent running down the stem. As the fungus ages the pores look more open and serrated. Tubes are 1-4mm deep.

Smell:

Not distinctive or slightly mushroomy

Spores:

white

Uses & edibility of Tuberous polypore

Edible, light mushroom flavour, can be tough, best when young 

Tuberous polypore Could Be Confused With…

Looks like a mini version of related Dryads saddle (Cerioporus squamosus) which is also edible but much bigger the scales pattern on top is darker and had a bulbous darker stem. Pictured below.

Also Black Footed Polypore (Polyporus leptocephalus) when young which has a black stem as the name suggests, much smaller pores and no scales on top. 

Caution and known hazards 

None known

Resources

More info here