Summary: Features include growth flat on wood with the orange-cinnamon to cinnamon pore surface exposed, cylindric curved spores measuring 3.5-5 x 1-1.5 microns, and scattered heavily incrusted, thick-walled cystidia. The description is derived from Gilbertson(1).
Microscopic: spores 3.5-5 x 1-1.5 microns, cylindric, somewhat allantoid (curved), smooth, inamyloid, colorless; basidia 4-spored, 10-13 x 4-5 microns, clavate, with basal clamp; cystidia frequent to rare, completely imbedded or projecting to 40 microns, 40-70 x 9-11 microns, clavate, partly to completely incrusted, thick-walled, hyphal pegs usually present; hyphal system dimitic, subicular generative hyphae mostly 2-6 microns wide, some near substrate up to 8 microns wide, "thin-walled, rarely branched, with clamps", subicular skeletal hyphae 2-6 microns wide, colorless, "thick-walled, non-septate, with rare branching", trama hyphae similar
Notes: Junghuhnia collabens has been found in BC, OR, ID, AB, NS, ON, AZ, CO, LA, MN, MT, NH, NY, SD, and WI, and circumglobally in the conifer zone, (Gilbertson).
Habitat and Range
Habitat
annual, on dead wood of conifers, rarely on hardwoods, causes a white pitted rot of dead conifer wood: the "decayed wood tends to become laminated and in the advanced stages often contains masses of pinkish buff mycelium"