Summary:
Features include 1) resupinate growth on conifer wood, 2) fruitbody (in the herbarium) cream to tan, may become very granulose, tuberculate, 3) spores that are short-oblong to oval, smooth, and inamyloid, 4) gloeocystidia that are slender and thin-walled, the projecting ones often terminated by a small papilla, 5) a dimitic hyphal system, the generative hyphae with clamp connections, the skeletal hyphae strongly dextrinoid and branching.
Scytinostroma jacksonii has been found in BC and MT (Ginns). The holotype is from BC.
Fruiting body:
in the herbarium: effused, nearly smooth toward the narrow, very pale cream margin, may become very granulose, tuberculate, cream to alutaceous, adherent, not membranous, not friable, easy to section, (Boidin(1))
Microscopic:
SPORES 4-5.25(6) x 2.8-3.2 microns, short, oblong in side view, sometimes weakly depressed next to the apiculus, somewhat oval in face view because a little wider (up to 4 microns) in the apicular part, smooth, inamyloid, thin-walled; BASIDIA 4-spored, 22-25 microns long and 3-4 microns wide at the top, narrow in the middle (2 microns wide for example), sterigmata 4-8 microns long at maturity; GLOEOCYSTIDIA slender, 30-35 x 2.5-4.2 microns, thin-walled, contents in part refringent, the emergent ones tapered and often terminated by a small papilla [illustrated as a small sphere], 1.2 microns in diameter; IN SECTION 100 to 300 microns excluding the tubercles; consisting of an upper dense zone that is strongly dextrinoid and a lower part of variable thickness appearing very pale in Melzer''s reagent due to its loose structure and formed of the clamped generative hyphae, and of fibers more or less branched, 0.8-1.5-2 microns wide, and moderately dextrinoid; the very dextrinoid fibers of the surface layer branch more or less dichotomously, they may have a thick-walled trunk 2.5-3 microns wide, and branches irregularly disposed, long or short, strongly dextrinoid except near the thin-walled tips; in the wood fibers of the underlying wood, there are generative hyphae about 2 microns wide, thin-walled, and non-dextrinoid; in the interstices of the substrate is formed a mycelial felt composed of generative hyphae but particularly of long, slender, dextrinoid hyphae, 0.8-1.2 microns wide, not or rarely branched, and one can also distinguish fusiform gloeocystidia, 4-5 microns wide, bearing 1-3 lateral papillae, (Boidin(1))
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