Corallocytostroma ornithocopreoides R.G. Shivas & Alcorn (as 'ornicopreoides')

Description

Sclerotia irregular, often tooth shaped with rounded-pointed ends, 5-35 mm long x 5-20 mm wide, grey, covered with brown flecks, sometimes tinged with purple, smooth, with longitudonal grooves.

Stromata surrounding meristematic host tissue including culm nodes, inflorescences and shoot tips, solitary, superficial, subglobose, 5-30 mm in diameter, grey sometimes tinged with yellow or brown, surface irregular.

Conidiomata numerous coralloid, convoluted loculi immersed in conidiomata.

Conidia of one type

  • conidia formed from cylindrical to narrowly obpyriform conidiogenous cells on conidiophores lining the locules, globose, 4-7 µm in diameter, hyaline, aseptate, smooth.

Ascostromata very rare, black, consisting of a capitulum with immersed perithecia borne by a stipe arising from a sclerotium.

Hosts
   
Host family: Poaceae
   
Host species: Astrebla pectinata
Dichanthium fecundum

Distribution

NT, WA

Comments

This fungus was described from two common grasses in northern Australia which were growing on properties where grazing cattle were exhibiting signs of a mycotoxicosis commonly called “black soil blindness”. The mycotoxosis occurred after wetter than normal winters. Evidence from various sources suggests that the fungus belongs in the Clavicipitaceae, and that its asexual state may be similar to that of Claviceps.

Highslide JS
Corallocytostroma ornithocopreoides on Astrebla sp. - BRIP 22404. Scale bar = 1 cm.
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Corallocytostroma ornithocopreoides on Unknown host.
Highslide JS
Corallocytostroma ornithocopreoides on Unknown host.
Highslide JS
Corallocytostroma ornithocopreoides on Unknown host.
Highslide JS
Corallocytostroma ornithocopreoides on Astrebla pectinata - BRIP 22605.
Scale bar = 20 µm.
Highslide JS
Corallocytostroma ornithocopreoides on Astrebla pectinata - BRIP 22605.
Scale bar = 20 µm.
Highslide JS
Corallocytostroma ornithocopreoides on Astrebla pectinata - BRIP 22605.
Scale bar = 20 µm.