Pileus 10–45mmdiam,convexatfirst,becomingplane to infundibuliform with a depressed center,with or without a small papilla, smooth, sometimesfaintly scaly toward center, viscid, deep orange-brownto deep orange when immature becoming light todeep orange, often blotchy, often darker toward cen-ter; margin incurved to straight when immature,becoming straight to upturned and often slightlywavy when mature. Lamellae adnate to subdecur-rent,slightlycrowded,palecreamtopaleyellowtopale orange, discoloring brownish orange in age orwhere damaged. Stipe 10–20 62.5–7.5 mm, equalto clavate, central, smooth, dry, at first covered byfaint whitish pubescence, pale orange, discoloringdingy orange to dingy light brown where damaged,hollow. Latex scarce, watery, unchanging. Contextof pileus and stipe pale orange. Odor mild. Flavormild. Basidiospore deposit not observed. Basidios-pores 8–10 66–8mm, average 58.6 67mm,Q51.14–1.38, Q¯51.24, hyaline in 2.5% KOH,broadly ellipsoid; ornamentation amyloid, of isolatedwarts connected by fine lines, up to 0.5 mmhigh.Basidia 38.1–66.0 68.9–10.2 mm, four-spored. Pleur-omacrocystidia 73.7–127 66.4–10.2 mm, narrowly fusiform to lanceolate, with acute to moniliformapex, thin-walled, scatteredtoabundant.Cheiloma-crocystidia 35.6–89 65.1–10.2 mm, conical to fusi-form, with acute to moniliform apex, thin-walled,sparse to abundant. Pileipellis an ixotrichodermwith well-developed gelatinous layer.Distribution and habitat: Lactarius lanceolatus origin-ally was described from arctic-alpine Alaska (Millerand Laursen 1973) and phylogenetic analyses(including the holotype) further confirm its pre-sence in the central Rocky Mountain alpine zoneand Svalbard. In alpine areas on the Beartooth Pla-teau it occurs with Salix reticulata and possibly otherSalix species (S. arctica,S. planifolia); it is notreported from the southernRockyMountains.Over-all L. lanceolatus appears largely confined to arctic-alpine habitats.