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

Status: Accepted

Name: Lactarius cretaceus

ICN Identifier: missing

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Author: D. Stubbe & Verbeken



Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Russulales

Family: Russulaceae

Genus: Lactarius

Brief Description: [See More | Edit]

Pileus 30–35 mm diam., irregularly concave, with depressed centre, grooved towards the margin; margin distinctly crenate and inflexed to reflexed; surface dry and velutinous, rugulose in centre, pale greyish cream-coloured (4B2–5B2), in central area with a brownish tinge (5C3, but slightly browner) and more or less plain cream-coloured (4A2) at the margin. Stipe 35 — 4–6 mm, cylindrical, gradually tapering downwards and rather slender, eccentrical; surface dry, faintly longitudinally rugulose, pale, whitish. Lamellae broadly adnate, distant (5–6 L+l/cm), broad (up to 6 mm), without anastomosing veins, cream-coloured (4A2–3), slowly (within half an hour) staining reddish and later on reddish brown (8BCD6–8) where bruised and injured; edge smooth, paler than lamellae surface. Context thin in pileus, stuffed in stipe, whitish with a very pale cream-coloured tinge, when exposed staining very slowly (half an hour to an hour) reddish and later on reddish brown (8BCD6–8), mostly near stipe surface, not so much in pileus context; smell unremarkable, fungoid; taste mild. Latex scarce, watery and transparent. Spore print not observed.
Basidiospores 6.4–7.4 — 5.6–6.9 (7.0) µm, Q = 1.05–1.23, on average 6.9 — 6.3 µm, Q = 1.10 (n = 20), subglobose; ornamentation amyloid, distinctly zebroid or winged, composed of long, firm and thick ridges up to 2–2.5 (3) µm high, with crenulate edges, rarely branching or interconnecting, but with abundant low and isolated, short ridges and warts present; plage distally amyloid. Basidia 50–75 — 10–15 µm, long and narrowly clavate, 4-spored, though 1-spored basidia occasionally observed, very often with guttulate contents; sterigmata 4–7 — 1.5–2 µm. Macrocystidia absent. Pleuropseudocystidia 4–6 µm diam., abundant, subclavate or irregularly cylindrical with obtuse apex, sometimes branched, containing coarse, amorphous but refringent granules. Lamellar edge containing basidia and basidioles, no obvious cheiloleptocystidia present. Lamellar trama predominantly composed of inflated hyphae intermixed with cellular elements; lactifers abundant. Pileipellis a trichopalisade to palisade, 80–120 µm thick, hyaline; suprapellis composed of long and slender terminal elements, 30–60 — 2–5 µm, often septate, subcylindrical, tapering towards the apex, thin-walled or with slightly refringent cell wall, erect or oblique; the apex sometimes subcapitate; subpellis composed of subcellular and inflated hyphal elements, up to 25 — 15 µm but smaller towards the terminal elements of the suprapellis, thin-walled. Stipitipellis a trichoderm, rather thin (40–90 µm thick), composed of filamentous and sligthly inflated hyphae, 2–5 µm diam., thin-walled or with refringent cell walls but also clearly thick-walled elements present (cell wall = 1 µm); terminal elements subcylindrical, repent, recumbent or erect, hyaline; delimited by a thin but dense layer of parallel hyphae above the underlying trama; pseudocystidia and lactifers moderately abundant.
Habitat: Dipterocarp lowland rain forest, dominated by dipterocarps and Fagaceae.
Known distribution: Peninsular Malaysia.

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