Summary:
Features include 1) growth on coniferous branches, 2) fruitbodies that are erumpent, small, composed of single perithecia or 3-12 coalesced, with a superficial, light gray-brown carbonous surface and white fleshy-leathery inside, the surface cracked, uneven from prominently projecting perithecia, 3) spores that are very variable in shape, widely elliptic and fusoid to elliptic-oblong, (young spores with a colorless sheath), dark brown to almost opaque, diagonally uniseriate or uniseriate in asci, with paraphyses present. It was considered to be a Rosellinia by Petrini and Mueller (1986), but the taxonomic position is uncertain, (Ju).
Hypoxylon diathrauston has been reported from BC (Redhead(5)). It has been found in OR, ID, CA, CO, MT, Switzerland, (Miller, J.H.)
Fruiting body:
stromata [fruitbodies] erumpent, 0.2-1cm x 0.2-0.5cm, "small, composed of single perithecia or 3-12 coalesced, superficial, on small branches, light gray-brown surface and white inside, especially below the perithecia", "surface carbonous but interior fleshy-leathery, uneven from prominently projecting perithecia, rimose, ostiola papillate, often with a truncate area, sometimes collapsed", (Miller, J.H.)
Microscopic:
SPORES 20-36 x 12-18 microns, very variable in shape, widely elliptic and fusoid to elliptic-oblong, inequilaterally elliptic with obtuse ends, young spores with colorless sheath (readily dissolving from mature spores), thickened at ends, 1.5 microns at sides and 2-3 microns at ends, dark brown to almost opaque, diagonally uniseriate or uniseriate; ASCUS 180-210 x 18 microns in spore-bearing part, cylindric, pedicel [stem] 20-40 microns long; PARAPHYSES present; PERITHECIUM 700-1000 microns in diameter, hemispheric, (Miller, J.H.)
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