Suillus tridentinus    (Bres.) Singer 

New classification: Basidiomycota/Agaricomycotina/Agaricomycetes/Agaricomycetidae/Boletales/Suillaceae  
Former classification: Basidiomycota/Homobasidiomycetes/Agaricomycetideae/Boletales/Boletaceae  

synonyms: Boletus tridentinus, Ixocomus tridentinus 

edibility : discard

potential confusions with  Suillus tridentinus toxicity of Suillus tridentinus genus Suillus  

The cap is brown to orange-red, fleshy at the centre, hemispherical then very convex, bumpy at the centre, finally flattened, sometimes a bit conical. The cap surface is sticky (hardly viscid) when damp, then dry and covered with thin, more or less inlayed fibrils, totally and easily peelable. The cap margin is smooth, inrolled then expanded, with white veil remnants in young specimens, disappearing with age.

The stem is firm, full. It is cylinder shaped; often curved and swollen towards its base, a bit fibrillose-scaly, and with a ring. It is not easily separated from the cap. The stem is concolorous to the cap, slightly darker at the base. There is sometimes a rough network at the top coming from the decurrence of the tubes. The membranous ring is sheathing and ascending, fragile and short-lived, whitish to yellowish. It initially connects the stem to the cap margin, forming a veil in young specimens..

The flesh is thick, tender at first in young specimens, then soft and spongy in the cap, It is more fibrous in the stem. It is lemon yellow, turning slowly pink when exposed to air, without any shade of blue in between, and brownish in the stem; its taste is faint and mild; the odour is weak and pleasant, fruity to acidic;

The tubes are adnate and slightly decurrent, rather short (5-10 mm). They are yellow then orange brown.

The pores are angular, quite large (1mm diameter), widening close to the stem, composed with smaller pores. They are bright orange yellow then rusty yellow brown, and eventually cinnamon. They turn to red-brown when pressed. The spore print is dark-straw to golden-brown.

It grows in the mountains, on a rather calcareous soil, exclusively associated to larch.

The fruiting period takes place from June to November.
Dimensions: width of cap approximately 8 cm (between 4 and 12 cm)
  height of stem approximately 7 cm (between 4 and 12 cm)
  thickness of stem (at largest section) approximately 15 mm (between 10 and 30 mm)
  spores : 9-13 x 4-5 microns, spindle-shaped to ellipsoid

Chemical tests : flesh becomes vinaceous-brown when in contact with ammonia.

Distinctive features : viscous cap, scaly-fibrillose, with orange shades; only with larch; large orange-yellow pores, turning reddish when pressed; stem with white to yellow membranous and short-lived ring;

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

page updated on 14/01/18