Name: Lactarius cyanescens D. Stubbe, Verbeken & Watling
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First person to use this name on MO: Danny Newman
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Rank: Species

Status: Accepted

Name: Lactarius cyanescens

Author: D. Stubbe, Verbeken & Watling



Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Russulales

Family: Russulaceae

Genus: Lactarius

Brief Description:

Pileus 10–90 mm diam., convex when young, becoming plano-convex to almost applanate, centre depressed, sometimes with small papilla, margin involute or inflexed and smooth when young, becoming deflexed to straight and crenate when mature, surface faintly velutinous when dry, central area either smooth or rugulose, towards margin concentrically wrinkled and often radially grooved, clouded brownish grey to greyish brown (5C3, 5D3-4) or sepia-coloured (cc. 26), often with paler, dirty cream-coloured patches or sometimes almost entirely brownish cream-coloured (5A2-5B3 with a brownish tinge), mostly paler near the margin, staining blue or greyish blue where bruised (22-23DE5-6, 24E4-6). Stipe 10–50 — 3–13 mm, equal or slightly tapering downwards, more or less cylindrical, central or eccentric, surface dry, faintly velutinous, smooth, mostly paler than pileus, cream- to greyish cream-coloured. Lamellae sinuate to adnate with decurrent tooth or subdecurrent, distant (3-5 L+l/cm at midradius), moderately broad, cream- to dark cream-coloured (4A3-4), bluing when bruised (23D4-7), edge entire, concolorous. Context moderately thick in pileus, stuffed or sometimes hollow in stipe, dirty whitish but within minutes staining deep blue (23ABC5-6) due to the latex, often first staining bluish green (cc.69, 25A6) and turquoise before becoming deep blue and, when drying, dark blue (23DE7-8); smell unremarkable; taste mild or slightly acrid. Latex abundant, thick, white or cream-coloured, gradually turning pale bluish green to turquoise (23-24A3-5, cc. 69) and finally bright blue (23BC6-7), drying dark blue (23DE7-8), barely changing or faintly yellowing when isolated; taste not remarkable.

Basidiospores 5.3–6.1–6.8–7.6 — 4.8–5.4–6.5–7.2 µm (Q = 1.01–1.04–1.12–1.22; n = 200), globose to subglobose; ornamentation amyloid, zebroid, composed of mostly long and isolated ridges, = 1.5–2 µm high, sometimes branching, often with several ridges parallel to one another, the edge smooth, faintly waving or slightly crenulate, low, irregular and isolated warts present between the ridges; plage distally to totally amyloid. Basidia 40–60 — 9–14 µm, clavate to subclavate and rather slender, tetrasporic; contents sometimes with oil-droplets; sterigmata 4–10 — 1–2 µm. Pleuromacrocystidia absent. Pleuropseudocystidia 5–8(10) µm diam., moderately abundant to abundant, emergent, mostly clavate or subcylindrical and irregularly constricted, sometimes with subcapitate apex or branched, often with crystalline contents. Hymenophoral trama mixed, composed of inflated hyphae and sphaerocytes; lactifers abundant or moderately abundant. Lamellar edge sterile; cheiloleptocystidia 11–40 — 3–7 µm, mostly subfusiform to sublageniform or lageniform and tapering towards the apex, often with slightly refractive cell walls, very abundant and sometimes forming a broad zone along the lamellar edge (100–200(600) µm). Pileipellis a palisade, 40–80 µm thick, containing intracellular, brown pigmentation, often covered by a thin mucus-layer; cell walls refractive and often thickened; suprapellis composed of subfusiform to cylindrical terminal elements, 10–30 — 2–5 µm; subpellis composed of a few to several layers of isodiametric cells and inflated hyphae; lactifers not abundant. Stipitipellis a trichopalisade, 35–70 µm thick, mostly with brown, intracellular pigment, sometimes covered in a thin mucus-layer, cell walls refractive or thickened; terminal elements 8–30 — 2–5 µm, subfusiform to cylindrical; hyphae 2–4 µm diam., hyaline; lactifers not abundant.

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Created: 2016-04-08 00:24:23 CDT (-0400) by Danny Newman (myxomop)
Last modified: 2018-12-28 01:14:25 CST (-0500) by Image Sharer (image sharer)
Viewed: 12 times, last viewed: 2019-07-09 17:39:25 CDT (-0400)
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