Polyporus arcularius    (Batsch) Fr. 



New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Incertae sedis/Polyporales/Polyporaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Aphyllophoromycetideae  

synonyms: Polyporus anisoporus 
(unconfirmed synonyms: Lentinus arcularius)  

edibility : inedible

potential confusions with Polyporus arcularius toxicity of Polyporus arcularius genus Polyporus  

The cap is yellowish to yellow brown, easily separated, tough or rubbery, circular-convex or flat, depressed at the centre or even funnel-shaped. The cap surface is dotted with fine scales or hair, more or less outcurved, mostly visible at the cap's margin. The cap margin is thin, inrolled when dry.

The flesh is white, elastic then quickly tough; its taste is mild; the odour is weak;

The tubes are whitish, slightly decurrent, short (2 to 3mm).

The pores are very large and angular, shaped like a diamond or an elongated hexagon (1-2mm x 0,5-1mm), white then ochre-yellow, smaller closer to the margin or the stem. The spore print is white.

It grows in broad-leaved woods, on stumps or dead branches. It privileges warm areas, from spring to autumn, essentially on hazelnut or ash.

The fruiting period takes place from April to September.
Dimensions: width of cap approximately 4 cm (between 1 and 7.5 cm)
  height of stem approximately 2.5 cm (between 1.5 and 3 cm)
  thickness of stem (at largest section) approximately 6 mm (between 4 and 7 mm)
  spores : 6,5-8,5 x 2,5-3,5 microns, ellipsoid sometimes slightly incurved

Distinctive features : spring species, rubbery to tough; white and angular, large sized pores; cap with hairy margin

Polyporus arcularius is still unreported so far in the forest of Rambouillet, and is quite rare, more generally speaking .



page updated on 14/01/18