Reposted by Mark A. Spencer
Mark A. Spencer
@fungiflowers.bsky.social
1.2K followers 2.4K following 343 posts
Consultant & forensic botanist. BSBI/LNHS. Urban plants, INNS, climate change, natural history museology. Criminal (missing persons, deposition scenes, trace evidence) & Civil procedures Expert Witness. LGBTQIA+, Sister of Perpetual indulgence, trans ally.
![Subgenus Russula - subsection Integroidinae
Russula claroflava Grove.
[claroflava with a clear yellow colour]
Syn. R. flavorubescens
Cap a bright, clear yellow, lemon-yellow, gold-yellow without
olivaceous tones.
Gills moderately crowded, broad, ivory-white then cream-ochre, bruising and aging grey-black especially on the edges. Stem cylindric-clavate, white, sometimes briefly tuming red when scratched before tuming slowly grey-black.
Taste mild.
Odour nil
Macrochemicals FeSO4 pale pink, guaiac very slowly and weakly blue (+), formalin bright orange-red.
Habitat common throughout Britain in wet areas under Betula
Pileocystidia absent.
Fuchsinophile hyphae numerous, long, slender, 4.5-6 pm, with prominent external encrustations.
Spores 8.0-9.6 x 6.4-7.8 µm, warts to 0.6 pm, mostly iso-lated with the occasional connective.
Spore deposit dark ochre (IIIc).
fuchsinophile hyphae
Ilic
NOTES
A beautiful species growing in Betula woods, in damp glades, bogs and moors. The richness of its vivid yellow cap has been compared to lemons, egg yolks, butter, chrome or cadmium-yellow. However it is described it has a rather restricted tonal range and does not vary that much. It is common throughout Britain, wherever there is boggy ground and Betula, Along with the striking yellow of its cap and habitat, all parts blacken when damaged or with age. These three features alone are usually sufficient for a correct identification. A totally mild species, it has ochre spores around IIIe. Microscopically it lacks pileocystidia but has instead fuchsinophile hyphae. It has averaged-sized slightly ellipsoid to ovoid spores, with isolated warts and some connate ridges. Rately, specimens may first turn bright red when scratched before blackening.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:fy6kbvccfocqjzk72lrdj3kd/bafkreia64jnlq36poymwu2gfid273nityypqytpjjhnklehsyhkdykqf7u)
