Summary:
Features include flat growth tightly attached to conifer wood with the pore surface exposed, cream pore surface that darkens to yellow or orange, and microscopic characters including small cylindric to slightly curved spores that measure 4-5 x 1.5-2 microns, heavily incrusted thick-walled cystidia, and hyphal pegs; The online Species Fungorum, accessed September 4, 2018, gave the current name as Butyrea luteoalba (P. Karst.) Miettinen, in Miettinen & Ryvarden, Ann. bot. fenn.: 161 (2016), but MycoBank, accessed the same day, gave that name as a synonym of Junghuhnia luteoalba (P. Karst.) Ryvarden.
Junghuhnia luteoalba has been found in BC, OR, ID, AB, NF, ON, PQ, AZ, CO, FL, GA, LA, MA, MD, MN, MT, NC, NH, NY, PA, TN, VA, VT, and WI, (Gilbertson), and Europe and Asia (Breitenbach).
Cap:
growing flat on wood with pore surface exposed, spread out up to 20cm, tough, not readily separable, margin fertile or sterile, if the latter ivory white, up to 0.1cm wide, thin, slightly fringed, (Gilbertson), growing flat on wood, forming patches several centimeters across and 0.1-0.4cm thick, attached tightly, fibrous and tough; margin distinctly bounded, sterile and whitish for 0.05-0.1cm, in part somewhat fringed, (Breitenbach)
Flesh:
subiculum less than 0.1cm thick, tough-fibrous; cream-colored to pale buff, (Gilbertson), up to 0.05cm thick, white, (Breitenbach)
Pores:
4-8 per mm, circular to angular, with thin walls that soon becoming torn; cream-colored when fresh, drying pale buff; tube layer up to 0.2cm thick, continuous with subiculum and colored the same or slightly darker, (Gilbertson), 4-5 per mm, angular; "cream-white to yellow in places"; tube layer 0.1-0.3cm thick, (Breitenbach), 4-8 per mm, round to angular, "edges thin, lacerate"; "cream, darkening to yellow or orange", (Ginns)
Taste:
mild (Gilbertson), unpleasant, somewhat bitter, (Breitenbach)
Microscopic:
spores 4-5 x 1.5-2 microns, cylindric, straight to slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 13-20 x 4-5.5 microns, clavate, with a basal clamp; cystidia abundant to infrequent, completely imbedded to projecting to 30 microns, 40-70 x 9-14 microns, clavate to fusoid, thick-walled, heavily incrusted, "usually most abundant near dissepiment edges and originating from subhymenial tramal skeletal hyphae", cystidioles also present, 13-27 x 4-5 microns, fusoid, thin-walled, with basal clamp, hyphal pegs usually abundant (ridges or fascicles of sterile hyphae that appear as peg-like projections in cross-sections of tubes); hyphal system dimitic, subicular generative hyphae 2-4 microns wide, thin-walled, rarely branched, with clamp connections, subicular skeletal hyphae 2-4 microns wide, colorless, thick-walled, nonseptate, rarely branched, trama hyphae similar, (Gilbertson), spores 5-6.5(7) x 1.8-2.3(2.5) microns, cylindric, allantoid, smooth, inamyloid, colorless, with droplets; cystidia embedded in hymenium, up to 100 x 7-15 microns, thick-walled, "with coarse, dense incrustation on the upper part", (Breitenbach)
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