Fig. 11.4Cellular interactions in Ustilaginomycotina.
Material illustrated in (d)and(e) was prepared using
freeze substitution.Bar¼0.5mm. (a)–(d) Local interac-
tion zones, representative of Exobasidiomycetes. (a)
Local interaction zone without interaction apparatus,
representative of Georgefischeriales, Tilletiales, and
Microstromatales. Intercellular hypha (ih) ofConidios-
poromyces ayresii(Berk.) Va ́nky with secretion profile of
one primary interactive vesicle (arrow)incontactwith
host cell wall (HW). Note electron-opaque deposits at
host side (arrowhead). Host response to infection is
visible at R. (b) Local interaction zone with simple inter-
action apparatus, representative of Entylomatales and
Ceroceosorales. Intercellular hypha (ih) ofEntyloma
hieraciiH. & P. Sydow in contact with host cell wall
(HW) showing exocytosis profile of simple interaction
apparatus (arrow). Note electron-opaque deposit at host
side (arrowhead). Host response to infection is visible at
R. (c) Local interaction zone with complex interaction
apparatus containing cytoplasmic compartments, repre-
sentative for Doassansiales. Intercellular hypha (ih) of
Doassinga callitrichis(Liro) Va ́nky, R. Bauer & Begerow
in contact with host cell wall (HW) showing exocytosis
profile of one complex interaction apparatus (arrow).Ustilaginomycotina 303