Merci Montsegur et Claudius
Voici la description complète, je pense pas que se soit le bon , non plus. La couleur des lames ne correspond pas. Seulement deux stations connues donc la variabilité de l’espèce n'est pas vraiment établie...
Cortinarius chailluzii Frøslev & T. S. Jeppesen, sp. nov.
MycoBank no.: MB 500728 (Figs 1B, 2B, 3B & 4B)
Etym.: chailluzii (Latin), after Foreˆ t du Chailluz.
Pileo 38–65 mm lato, hemisphaerico, dein plano-convexo, glutinoso,
primo luteo, dein brunneo, margine luteo, KOH ope roseo.
Lamellis griseo-violaceis. Stipite 40–60 8–15 mm, bulboso, bulbo
marginato, pallido, interdum in apice violaceo. Margine bulbi e
velo pallido vel brunneo. Facie externa mycelioque albida, KOH
ope roseo. Carne albida, sapore miti, odore nullo, KOH ope nullo
vel pallido rosea. Sporis amygdaliformibus vel limoniformibus,
grosse verrucosis, 9.5–10 5.5–6.5 mm.
Typus: France: Doubs: Foreˆ t du Chailluz, Quercus spp. and Carpinus
betulus, 16 Oct. 2000, T. G. Frøslev & T. S. Jeppesen, TSJ2000-085
(C - holotypus).
Pileus 38–65 mm, hemispherical then plano-convex, glabrous,
glutinous, margin yellow (2A4–2A5), towards centre soon becoming
more or less brown (6D6–6D7–7D7). Lamellae emarginate,
greyish violet (17A2–17A2), most coloured towards the
edge. Stipe 40–60 8–15 mm, with a marginate bulb (–35
mm), whitish, sometimes with a fugacious violaceous tinge
in the upper part. Bulbipellis and mycelium white, bulb margin
(veil) stains brown (6D6-6D7). Context whitish. Taste mild
and smell neutral to slightly earth-like. Spores narrowly amygdaliform
to slightly citriform with narrow apex, with coarse
ornament, 9.5–10(–10.5) 5.5–6.5 mm, average 10.1 0.3
5.7 0.3 mm; Q ¼ 1.77 0.10.
Chemical reactions: KOH on pileipellis brick-red (9C8) to
red brown (9E8) within 60 s, darkest on centre, on bulbipellis
pastel red (9A4–9A5), in context negative to very weak
rose.
Habitat: Frondose forests with Fagus sylvatica, Carpinus
betulus and Quercus spp. At the type locality we also found
C. nymphicolor, C. arcuatorum, C. citrinus and C. xanthophyllus.
Observations/Discussion: C. chailluzii is recognised by the
bright yellow pileus margin, which contrasts the brown centre,
recalling the oxidation seen in several fulvoid species,
and distinguishing it from C. cisticola, which has a more uniformly
coloured pileus. Other similar species have either
a negative reaction (C. calochrous, C. ochraceopallescens etc.) or
an intense pink KOH reaction (C. catharinae) on the bulbipellis.
Microscopically, it occupies an intermediate position (Figs 2
and 3B), and with the limited knowledge of its variation it
might be difficult to separate from several others on microscopy
alone. Presently, we only know this species from two collections
including the type. The collection published under
the name C. caroli in Consiglio et al. (2004) has an identical
ITS sequence and morphology and represents the second record
of this species. (For a discussion of the binomial C. caroli
see the discussion under C. cisticola.) The species is named after
the forest where we first found it, Foreˆ t du Chailluz, in
Doubs, France. As we have only encountered the species
once ourselves among many hundred collections of calochroid
species, it seems probable that the species is very
rare in the investigated area. An ITS sequence from the holotype
of C. chailluzii is available at GenBank (accession
DQ323962).
Additional specimens examined: Italy: Emilia-Romagna: Bologna,
Monterenzio, Ronchi, in mixed forest with Quercus pubescens and
Q. cerris, 8 Oct. 1996, G. Consiglio & G. Spisni, 96216 (as C. caroli)
(hb. Consiglio).
