Fig. 11.4(continued) The interaction apparatus and its
intercisternal space are excluded from the cytoplasm.
Note electron-opaque deposit at host side (arrowhead).
Host response to infection is visible at R. (d) Local
interaction zone with complex interaction apparatus
producing interaction tube, representative of Exobasi-
diales. Intercellular hypha (ih) ofExobasidium pachy-
sporumNannf. with interaction apparatus (arrow).
Note sectioned interaction tube (arrowheads) at adja-
cent cell walls of parasitic and host cell. (e) Enlarged
interaction zone between upper left plant cell and haus-
torium (h), representative of Ustilaginomycetes. The
haustorium (h) ofUstacystis waldsteiniae(Peck) Zun-
del is surrounded by an electron-opaque matrix within
host cell
◂
Fig. 11.5Septation of soral hyphae in Ustilaginomyco-
tina. Material illustrated in (b)–(e) was prepared using
freeze substitution.Scale bars¼0.1mm. (a)Simplepore
with two membrane caps (arrows)ofDoassinga callitri-
chis(Liro) Va ́nky, R. Bauer & Begerow, representative
of Melanotaeniaceae, Ceraceosorales, Doassansiales,
Entylomatales, Exobasidiales, and Microstromatales.
(b) Simple pore with two outer membrane caps (arrows)
and two inner nonmembranous plates (arrowheads)of
Ustacystis waldsteiniae(Peck) Zundel, representative of
Urocystidiaceae, Floromycetaceae, and Doassansiopsi-
daceae. (c)Simpleporewithtwomembranecaps
(arrows) and sectioned tube in pore channel (arrow-
heads), representative of Exobasidiales. (d) Dolipore
with membrane bands (arrows)ofTilletia barclayana
(Bref.) Sacc. & P. Sydow, representative for Tilletiales. (e)
Poroid structure in septum ofMycosyrinx cissi(DC.) G.
Beck, representative for Georgefischeriales and core
group Ustilaginales
304 D. Begerow et al.