Tranzscheliella Lavrov

Type

Tranzscheliella otophora Lavrov on Stipa richardsonii Link

Description

Sori superficial, naked, on the stems or aborted inflorescence branches of Poaceae which are covered by powdery spore masses. Infection systemic.

Spores solitary, brown, operculate or not, usually small.

Spore germination resulting in phragmobasidia.

Host-parasite interaction by intracellular hyphae lacking interaction apparatus.

Septa lacking pores.

Comments

Tranzscheliella contains about ten species, three of which occur in Australia. Species are characterised by naked sori on the surface of stems (and floral axes) of Poaceae, possessing relatively small spores. However, some species of Ustilago have similar sori and spores, and this has created problems for their classification. This confusion has been compounded by a recent molecular study which unexpectedly demonstrated that Tranzscheliella was not a member of the clade representing Ustilaginaceae (Begerow et al., 2006).

Species in Australia
 
Tranzsheliella austrostipae
Tranzscheliella hypodytes
Tranzscheliella minima

Key based on host taxonomy
 
On AustrodanthoniaTranzscheliella hypodytes
On Austrostipa1
1.  Peridium presentTranzscheliella minima
Peridium absent2
2.  Spores 4-6(-7) µm long, without appendagesTranzscheliella hypodytes
Spores 7-10.5 µm long, with appendagesTranzscheliella austrostipae
On DichelachneTranzscheliella hypodytes
On PoaTranzscheliella hypodytes