Lentinus arcularius.
Basidiomycota > Agaricomycetes > Polyporales > Polyporaceae.
There are nearly 30 synonyms including Polyporus arcularius and Boletus arcularius.
It is seen as a solitary mushroom or in groups of 2 or 3.
It grows on dead wood where it causes white rot.
The mycelium is white.
The stem, up to 4 (6) cm high and 4 mm wide is at or near the centre of the cap.
It is brown or yellow-brown and hairy or scaly.
The cap is 4 (7-8) cm across, convex, flat or with a shallow central depressoion.
It is pale tan with concentric zones of darker brown or yellow-brown scales and fibrils.
The margin has small hairs, up to 1 mm long projecting from it.
When dry it is concentrically ridged.
The tubes on the lower surface are up to 2 mm long.
The pore layer is white then brownish and the pores are hexagonal or angular.
The radially arranged pores run onto the stem where the tubes may be longer.
The walls between the pores are slightly incised.
The spore print is creamy white.
J.F.
