Name: Lactarius papillatus 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 papillatus

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 < 70 mm diam., convex to applanate and concave, often acutely umbonate, dry, matt, pale fawn tan or tinged flesh-coloured. Stipe 40-60 × 7-10 mm, subcylindrical, concolor- ous with pileus. Lamellae adnate-decurrent, distant, broad, 5-10 mm wide, interstices smooth, 23-32 lamellae, 2-3 lengths of lamellulae, concolorous with the pileus or paler. Context 3- 4 mm thick in the centre of the pileus, solid in stipe, firm, white to pale fawn. Latex white, copious, turning rufous pink on exposure; taste acrid. Spore print not observed.
Basidiospores 7.9-9.4(9.5) × 7.3-8.5(8.7) μm, Q = 1.05-1.16, on average 8.6 × 7.9 μm, Q = 1.09 (n = 20), subglobose; ornamentation amyloid, an almost complete but rather disorderly reticulum, composed of acute and slightly sinuous ridges, 1.5-2 μm high; abundant, very minute, isolated warts present; plage distally to almost completely and diffusely amyloid. Basidia distinctly clavate and large, 55-80 × 12-16 μm, 4-spored, usually hyaline; sterigmata sturdy, 4-9 × 1.5-2 μm. Pleuromacrocystidia moderately abundant, 45- 55 × 4-10 μm, subcylindrical to narrowly sub- clavate or clavate with obtuse apex, sometimes septate at the base, completely filled with strongly refringent, finely granular and needle- like contents, emerging from hyaline hyphae, slightly emergent, thin-walled. Pleuropseudo- cystidia moderately abundant, 4-10 μm broad, usually strongly enlarged at the apex, emergent, containing aggregated lumps of amorphous, refringent material. Lamellar edge nearly completely composed of cheiloleptocystidia, 10-20 × 5-8 μm, predominantly broadly clavate and hyaline, as terminal cells of chains composed of short, inflated hyphal elements; cheilomacrocystidia scattered to moderately abundant, 10-20 × 4-6 μm, fusiform and thin- walled, containing refractive, granular debris- like material. Lamellar trama composed of filamentous and inflated hyphae; lactifers abundant to very abundant. Pileipellis a tricho- palisade, 60-90 μm thick, hyaline or containing a faint, yellowish brown pigmentation, all elements thin-walled; suprapellis composed of erect and mostly cylindrical terminal elements, intermixed with fusiform and broadly clavate elements, 10-30 × 3-10 μm, sometimes more or less inflated at the apex, sometimes septate; subpellis composed of a layer of inflated or subcellular hyphae, oriented perpendicularly to pileus surface; lactifers and pseudocystidia moderately abundant. Stipitipellis a trichoderm, 100 μm thick, hyaline or with very faint, yellowish brown pigmentation; hyphae 3-5(10) μm broad, with scattered inflated hyphal elements; the terminal elements cylindrical with obtuse apex, erect, recumbent or oblique; lactifers moderately abundant.

Habitat: mid-elevation dipterocarp rain forest.

Known distribution: Borneo.

Descriptions: [Create]


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