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Species Information
Summary: Features include 1) resupinate growth on wood, 2) a fruitbody with olivaceous to rose color, the smooth surface appearing tomentose or felty under a 50x lens, 3) spores that are long cylindric to allantoid, smooth, and inamyloid, 4) cylindric cystidia that excrete a non-crystalline globule, and 5) a monomitic hyphal system, the hyphae with clamp connections.
Hyphoderma medioburiense has been found in BC, ON, PQ, AZ, CO, IA, MN, MT, and VT, (Ginns), as well as in Austria, Denmark, Finland, France, Norway and Sweden, (Eriksson).
Fruiting body: resupinate, about 0.01-0.02cm thick, "the living fruitbody may be rose-colored", yellowish ochraceous when dried; smooth, continuous to the naked eye but finely porose and tomentose under 50x lens (which may also reveal the globules on the cystidia as dark dots); margin "not differentiated", (Eriksson), effused; buff to pinkish buff; cracking on abruptly thinning out, (Lindsey), resupinate, 0.5-3cm long and 0.5-1.5cm wide, in section 0.02-0.03cm thick; dull olivaceous, in herbarium between light grayish olive and deep olive-buff; felty or fibrillose, not at all waxy; "margin thinning out and sometimes paler", (Burt)
Microscopic: SPORES 11-17 x 4-5.5 microns, allantoid, smooth, inamyloid, thin-walled, with numerous or a few larger oil droplets, often only one filling a large part of the spore; BASIDIA 4-spored, 30-40 x 7-8 microns, clavate, "often somewhat constricted or sinuous", with numerous oil droplets, sometimes with adventitious septations; CYSTIDIA 60-100 x 7-10 microns, only slightly projecting, cylindric, thin-walled, not encrusted, "apically excreting a non-crystalline, resinous matter, forming a globule on the top of the cystidium", the resinous matter "pale yellow in young fruitbodies, but turns darker with age and becomes light brown or even reddish brown"; HYPHAE monomitic: hyphae 3-4 microns wide, thin-walled, richly branched, "forming a dense texture in the subhymenium, looser next to the substrate", with clamp connections, (Eriksson), SPORES 11-14 x 4-6 microns, cylindric to allantoid, smooth, inamyloid, colorless, with abundant oily contents; BASIDIA 4-spored, 32-40 x 6-9 microns, clavate, with oily contents, with basal clamp connection; LEPTOCYSTIDIA on the average up to 95 microns long (but some up to 165 microns) x 7-10 microns, some projecting up to 30 microns, clavate to long-sinuous, thin-walled, with basal clamp connection; hyphal system monomitic, SUBICULAR HYPHAE 3.5-4.5 microns wide, thin-walled, nodose-septate, (Lindsey), SPORES 8-14 x 4.5-6 microns, cylindric, white in spore collection; BASIDIA 4-spored, large sterigmata up to 6 microns long; CYSTIDIA 6-8 microns in diameter, projecting up to 30 microns beyond basidia, cylindric, obtuse, "usually not incrusted, sometimes granule-incrusted", no gloeocystidia; in section "composed of suberect, thin-walled, even-walled hyphae 3 microns in diameter and of incrusted hyphae 5 microns in diameter over the incrustation", (Burt)
Habitat / Range
on conifer wood and hardwood: Abies lasiocarpa (Subalpine Fir), Carya sp. (hickory), Picea engelmannii (Engelmann Spruce), Pinus ponderosa (Ponderosa Pine), Populus tremuloides (Quaking Aspen), Quercus gambelii (Gambel Oak), associated with a white rot, (Ginns), on decayed barkless hardwood (Eriksson), on well-decayed wood (Lindsey), on wood and bark of fallen rotten limbs of Carya, (Burt)
Similar Species
Hyphoderma roseocremeum is similar in many respects, but it is white or cream colored rather than ochraceous, lacks the excreted resinous globules, and its spores are mostly 8-10 microns long, (Eriksson).
