OpisRussula atrorubens Quél 708633.jpg |
Russula atrorubens Quél.
Image location: Aarschot, Vlaanderen, Belgium
Description:
Pileus: 11-36 × 4-7 mm; convex to plane with low and fairly flat umbo; slightly sulcate margin; pruinose when young, somewhat remaining pruinose in the centre; finely granular surface (20x magn.) probably caused by sphaerical endcells in the pileipellis, dry to slightly tacky; starting off plum coloured, gradually showing more red around the margin, dark blackish purple in centre; cuticle peels to 1/3-1/2, reddish tones underneath the cuticle.
Lamellae: L: 56-75, l: 0-1; horizontally adnate, margins very finely fimbriate; subdistant; very little colour of the pileus spilling over at the margin of the pileus; very few lamellulae; white.
Spore print: White.
Stipe: 23-45 × 3-9 mm; cilindrical to subclavate, centrally attached; dry, surface finely but clearly rugulose over entire length; white with over time (after picking) slightly reddish brown base; very lightly attached to the ground.
Context: Firm, brittle, solid throughout; white, ever so slightly reddish in outmost base, cortex clearly visible directly after cross-section, but gradually fading over time.
Smell/taste: No particular scent; very actrid after a short amount of sourness.
Chem. ana.: Quick and fairly strong pinkish-orangy reaction to FeSO4, after 15 minutes reaction runs over large section of stipe around initial bruise; slight greenish after KOH 3% on context of stipe.
Microscopy:
- Spores: (Sub)globose to broadly ellipsoid; warts and small ridges forming a near to complete reticulum, which can be thin to fairly thick; warts are low (<0,5 µm).
- Measurements (1000x; H2O + Melzer; oil-im.; 1 sd = 1,02 µm; n=9)
- 8,16 × 5,10 µm
- 8,16 × 6,12 µm
- 7,14 × 6,12 µm
- 7,14 × 6,12 µm
- 7,14 × 5,10 µm
- 7,14 × 6,12 µm
- 6,12 × 5,10 µm
- 8,16 × 6,12 µm
- 7,14 × 6,12 µm
av. 6,63 × 5,20 µm
stats: (6,12) 6,63 (8,16) x (5,10) 5,20 (6,12) µm
Ecology: Salix sp., swamp forest, growing in small groups.
Used references: Kibby, G. (2016). The Genus Russula in Great Britain.
Based on microscopic features: See notes
Based on chemical features: See notes
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