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 Hypoxylon howeanum
BiostatusPresent in region - Indigenous. Non endemic
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Owner: Herb. PDD |
Description: Stromata: Stromata spherical, or hemispherical, or pulvinate; 5-9 mm long; 5-9 mm broad; 4-8 mm thick; perithecia inconspicuous; ostioles lower than or more or less equal to stromatal surface; stromatal surface rust to orange-brown, or dark brown (brown vinaceous); granules immediately below stromatal surface rust to orange, or red brown; KOH-extractable pigments rust, deep yellow-brown to orange; tissue below perithecia conspicuous, essentially homogeneous, dark; 7.5 mm thick.
Perithecia: Perithecia more or less globose; 0.3-0.5 mm diam.
Asci: Asci 80-130 µm long; 4.5-6.5 µm wide; stipe long with spores more or less confined to upper half of ascus; amyloid ring broader than high.
Ascospores: Ascospores 7.5-9.5 µm long; 4-4.5 µm wide; brown; 0-septate; in side view inequilateral, flattened on one side, curved; in face view elliptic; ends narrowly rounded. Germ slit straight, spore-length; on concave, curved side of spore. Perispore dehiscent in 10% KOH; smooth or with indistinct transverse thickenings.
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