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Summary: a sequestrate Lactarius; characterized by orange tones of outer surface and spore mass, strong maple-syrup odor, underground growth under conifers, and small, round or nearly round spores on 1-4-spored basidia that at maturity have a strongly amyloid partial to complete reticulum; found at least in WA and OR, (Castellano), southwestern BC to southwestern OR (Trappe(13))
Outer Surface: 3-10cm x 0.4-1.7cm, "the base indented around a slight basal protrusion", "the peridium meeting the basal protrusion or detaching" to leave a gap up to 0.5cm exposing underlying locules; orange-red to brown-orange, slowly becoming orange-brown where handl
Inner layer: milk: white to watery white, unchanging, (Castellano), often absent (Arora)
Stem: ranging from percurrent [going through spore mass] and protruding beyond the base, 0.1-0.2cm broad, to absent and represented as a small basal pad, colored as peridium, (Castellano), columella colored like peridium, percurrent and unbranched (Singer on the basis of one good section)
Interior: spore mass with orange-yellow to orange or brownish orange trama separating locules lined with pale orange yellow spore deposit, "locules tending to be sublamellate-radiating near the base, towards the peridium smaller and rounded", (Castellano), chambere
Odor: when fresh ranging from slight to pronounced, on dried specimens strongly sweet (of maple syrup), (Castellano), strong fragrant, like that of candy caps such as Lactarius fragilis or L. camphoratus (burnt sugar), especially when dry, (Arora), strong and r
Taste: mild (Castellano)
Microscopic: spores 7-10.5 x 7-10 microns, round to nearly round, measurement excluding the ornamentation of amyloid lines that when young have many short side-branches and often form a partial reticulum up to 0.5 microns tall, "at maturity more strongly amyloid and commonly forming a partial to complete reticulum 0.5-1 micron tall", occasional minute solitary amyloid warts in spaces between lines, sterigmal attachment inconspicuous, about 2 x 1 microns, oblique to axial; basidia 1-4-spored, 28-36 x 8-9 microns, sterigmata up to 9-12 microns long; cystidia not seen; trama of hyphae (4)8-12 microns wide, loosely interwoven, colorless, thin-walled; subcutis of interwoven, colorless, thin-walled hyphae with scattered greatly inflated cells; peridial epicutis "a compact trichodermium of variously shaped, thin-walled hyphal elements, often with yellow walls, but this soon collapsing to form a more or less amorphous yellow layer over the subcutis", (Castellano), spores 7.5-11(12) x 6.5-8(10) microns, round to nearly round, strongly amyloid ornamentation of fine lines 0.25-0.35 microns wide, "forming a broken network or system of branched and anastomosing lines with some isolated granules, major prominences rare and 0.8-1.0 microns high, most prominences 0.25-0.3 microns high", the wall yellowish transparent in Melzer's reagent, "sterigmal appendage about 2-3 microns long, oblique, not prominent"; basidia 1-spored to 4-spored, 28-36 x 8-9 microns, colorless in KOH, "sterigmata on 2-spored basidia often 9-12 microns long, typically straight and conic", basidioles numerous; cystidia scattered, 32-43 x 9-13 microns, fusoid-ventricose or broadest near the obtuse apex, thin-walled, colorless, content homogeneous or nearly so; tramal plates with a mediostratum of hyphae (4)8-12 microns wide, loosely interwoven, colorless, nongelatinous, with thin walls, lacking incrustations; subhymenium of hyphae about the same width "but with cross walls frequent enough to make the cells nearly isodiametric", laticiferous hyphae 9-12 microns wide also present, "somewhat hyaline, refractive"; sphaerocysts not seen "unless some of the more enlarged subhymenial elements be so interpreted"; peridial epicutis a compactly arranged trichodermium of nongelatinous, colorless to yellowish, thin-walled elements of various shapes: "crooked-filamentous, clavate, fusoid, or simply variously irregular"; peridial context of interwoven, colorless, thin-walled, nongelatinous hyphae "with only an occasional sphaerocyst and these not grouped into nests"; laticiferous hyphae colorless but distinct; clamp connections none, (Singer)
Habitat / Range
forms fruiting bodies beneath soil surface associated with various Pinaceae species, particularly Pseudotsuga menziesii (Douglas-fir) and Tsuga heterophylla (Western Hemlock) from 200 to 950m elevation, March through November, (Castellano), associated with Pseudotsuga menziesii (Trappe), October to March (Trappe, M.(1), Trappe, M.(3))
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2020-08-08 11:21:29 PM
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