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Growth, Differentiation and Sexuality

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Fungal Heterogenic Incompatibility 143<br />

Fig. 8.1.A–E Compilation of mycelial interactions in fungi. A Podospora<br />

anserina. Barrage formation between different geographical<br />

races. Sexual reproduction is not affected. Perithecia are produced<br />

in any combination between different mating types. B Podosporaanserina.Hyphalmorphology.Above<br />

hyphae in the contact<br />

zone of an intra-race combination, below hyphae within the barrage<br />

zone. C Podospora anserina. Barrage formation linked with<br />

sexual incompatibility (for details, see Fig. 8.3 <strong>and</strong> text). D Intra<strong>and</strong><br />

interspecific interactions between monokaryons of Polyporus<br />

ciliatus (cil) <strong>and</strong>Polyporus brumalis (bru) showing normal contact<br />

(left), <strong>and</strong> barrage (bottom) <strong>and</strong> border line (top <strong>and</strong> right).<br />

All monokaryons are compatible in mating type. E Cross section<br />

of a log colonized by wood-destroying basidiomycetes. Dark zones<br />

indicate the aversion lines of mycelia. Further details are given at<br />

various sites in the text (adapted from Esser 1956c, <strong>and</strong> Esser <strong>and</strong><br />

Meinhardt 1984a,b,d,e)

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