Baobabopsis enneapogonis RG Shivas, YP Tan, Telle & Thines

Description

Conidiophores not observed.

Conidia not observed.

Oogonia formed in the leaf blades which split into a tangled mass of vascular fibres, subglobose, (30-)32-40(-42) x (29-)30-36(-39) µm in diameter, golden yellow; wall (exosporium including warts) 3-11 µm thick, uneven, moderately verrucose with rounded warts, often with remnants of antheridium attached.

Oospores one per oogonium, globose-broadly ellipsoidal (20-)21-25(-26) x (19-)21-23(-24) µm in diameter, pale to golden yellow; wall (endosporium) 1-2 µm thick, even, smooth.

Hosts
   
Host family: Poaceae
   
Host species: Enneapogon cylindricus - BRIP (holotype), ,
   
  Enneapogon avenaceus - BRIP

Distribution

NT, WA

Comments

Thines et al (2015) consider that this species differs from B. donbarrettii in being a pathogen of Enneapogon and having less prominent warts and moderately verrucose oogonial walls. Like B. donbarrettii this species appears to be confined to Australia. B. enneapogonis is the only downy mildew fungus recorded on Enneapogon in the World.

Highslide JS
Baobabopsis enneapogonis on Enneapogon cylindricus - BRIP 60962.
Highslide JS
Baobabopsis enneapogonis on Enneapogon cylindricus - BRIP 53764.
Scale bar = 1 cm. Healthy plant (left) and infected plant (right).
Highslide JS
Oospores of Baobabopsis enneapogonis on Enneapogon cylindricus - BRIP 49822.
Scale bar = 10 µm.