Hypoxylon subgilvum Berk. & Broome

TELEOMORPH | CULTURES AND ANAMORPH | SPECIMENS EXAMINED | NOTES

TELEOMORPH

Hypoxylon subgilvum Berk. & Broome, J. Linn. Soc., Bot. 14: 120. 1873.

= Hypoxylon caaguazu Speg., Anales Soc. Ci. Argent. 18: 275. 1884.

Stromata effused-pulvinate, with inconspicuous to conspicuous perithecial mounds, 0.5-1 mm thick; surface umber (9), sepia (63), rust (39), sienna (8), dark brick (60), or bay (6); orange red granules immediately beneath surface and between perithecia, with KOH-extractable pigments orange (7); the tissue below the perithecial layer black, inconspicuous to 0.5 mm thick.

Perithecia obovoid to tubular, 0.1-0.3 mm diam x 0.2-0.7 mm high.

Ostioles lower than the stromatal surface.

Asci 90-160 mm total length x 4.5-7 mm broad, the spore-bearing parts 52-78 mm long, the stipes (15-) 30-90 mm long, with apical ring bluing to faintly bluing in Melzer's iodine reagent, discoid, 0.3-1 mm high x 1.5-2.2 mm broad.

Ascospores brown to dark brown, unicellular, ellipsoid-inequilateral, with narrowly rounded ends, 7-11 x 3.5-5 mm, with straight to slightly sigmoid germ slit spore-length; perispore dehiscent in 10% KOH, with inconspicuous to conspicuous coil-like ornamentation; epispore smooth.