Lophiostoma appendiculatum  

Anamorph: not known.
Teleomorph: ascomata perithecioid, vertically discoid-lenticular, immersed in rotten wood and bark, in large clusters. Wood-inhabiting morph with ascomata below a blackened surface and with only the elongated ostiolar region visible from the surface; ascomata 500-650 µm tall, 600-800 µm broad when measured parallel to the grain of the wood and 250-350 µm broad when measured perpendicular to the grain, the neck short and elliptical in horizontal section with the ostiole elongate and slit-like, ca 250 x 100 µm in size (including the surrounding wall tissue). Bark-inhabiting morph 400-650 µm diam. and 370-550 µm tall, subglobose, with a minutely papillate ostiole (non-papillate when developing on the surface of wood with bark already degraded), not elongate at all. Peridium black, quite thick-walled especially around the ostiole, coriaceous, composed of an outer layer of small heavily pigmented thick-walled angular cells and an inner layer composed of hyaline thin-walled cells. Interascal tissue of branched and anastomosed pseudoparaphyses 2-2.5 µm diam., embedded in a gelatinous matrix. Asci 110-140 x 20-24 µm, clavatewith a fairly long tapering stalk, thick-walled and fissitunicate, with a broad shallow ocular chamber, 4-, 6- or 8-spored. Ascospores arranged obliquely uniseriately to biseriately, 33-38 x 10-11.5 µm (in 8-spored asci), 42-45 x 12-15.5 µm (in 4-spored asci); ellipsoidal to fusiform-ellipsoidal, (5-) 7- (to 8-) septate, occasionally submuriform with an oblique longitudinal septum dividing one of the cells, distinctly constricted at all transverse septa, the cell above the primary septum usually swollen, thin-walled, initially hyaline but golden brown at maturity, strongly guttulate, smooth, initially completely surrounded by a gelatinous sheath ca 2 µm wide, this degrading at maturity and reduced to minute shallowly conical appendages at one or both ends of the spore.