Summary:
Diplomitoporus crustulinus is recognized by a deeply cracked, evenly cream to pale straw-colored pore surface growing flat on wood. The description is derived from Gilbertson(1).
Diplomitoporus crustulinus has been found in BC, ID, AB, NF, ON, AK, AZ, CO, ME, MI, MN, MT, NH, NY, TN, UT, VT, WY, and Europe, (Gilbertson)
Cap:
growing flat on wood with pore surface exposed, up to 0.4cm thick, tough drying woody, separable, margin narrow and white to pale yellowish brown
Flesh:
soft to more compressed when old white to pale straw-colored
Pores:
3-4 per mm, angular, thin-walled; cream to very pale straw-colored, with age and drying straw-colored to pale yellowish brown, "mostly cracking up in irregular pieces 1-4cm long and wide"; tube layer up to 0.3cm thick, "as if soaked in some light yellow resinous substance, but consistency rather hard"
Microscopic:
spores 5-7 x 2-2.5 microns, allantoid [curved sausage-shaped] to cylindric, smooth, inamyloid, colorless; basidia 4-spored, 15-20 x 4-6 microns, clavate; cystidia "none, but pointed non-projecting cystidioles occur scattered among the basidia 15-20 x 5-7 microns"; hyphal system dimitic: generative hyphae 2-4 microns wide, thin-walled, with clamp connections, skeletal hyphae predominant, 2-6 microns wide, solid to thick-walled, colorless and inamyloid, rarely branched and straight
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