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Species Information
Summary: Features include perennial flat growth on wood, a white to cream pore surface, white crumbly tissue under the tubes, relatively broad spores, cystidioles, and often oily to resinous irregular globules in microscopic preparation. The description is derived from Gilbertson(1).
Resinoporia crassa is known from BC (Ginns(28)), and WA, ON, AK, MI, MT, NY, OH, PA, WI, and the inner parts of North and Central Europe, (Gilbertson(1))
Cap: growing flat on wood, separable, soft when fresh, hard and brittle when dry, margin smooth, narrow, and white
Flesh: "context proper impossible to distinguish, up to 10mm thick and faintly zonate in section"
Pores: 3-6 per mm, white to cream; tubes "white to slightly yellowish as if partly soaked with resinous substances especially in old specimens, young parts of tubes distinct, lower parts white, disintegrated and crumbly with a cheesy consistency"
Taste: bitter
Microscopic: spores 4.5-7 x 2.5-3.5 microns, broadly cylindric to oblong elliptic, inamyloid, colorless; basidia 4-spored, "15-10 x 5-7" microns [sic], clavate; cystidia none, but fusoid, non-projecting cystidioles up to 18 microns long usually abundant among the basidia, colorless to weakly yellowish; hyphal system dimitic, generative hyphae, 2-5 microns wide, thin-walled, with clamp connections, skeletal hyphae 3-5 microns wide, thick-walled to solid, sinuous, unbranched to occasionally dichotomously branched, inamyloid, microscopic preparations often filled with oily to resinous irregular globules, (Gilbertson), microscopic preparations of fruitbody tissues "often contain numerous oily globules" (Ginns)
Habitat / Range
perennial, on conifer wood, causes a brown rot
Similar Species
Resinoporia sitchensis has a similar stratified fruitbody and may have resinous irregular bodies microscopically, but spores are narrower, cystidioles have a prolonged neck rather than being ventricose, and weakly dextrinoid hyphae are present in masses, (Gilbertson), Resinoporia sordida has a similar stratified fruitbody and may have resinous irregular bodies microscopically, but spores narrower, cystidioles absent or very rare, and weakly dextrinoid hyphae present in masses, (Gilbertson), R. sordida also has oily globules, but spores are narrower and skeletal hyphae have weakly amyloid walls, (Ginns).
