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6 Wood Discoloration

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20 2 Biology<br />

Fig.2.13. Structure of a fruit body (apothecium) of an ascomycete predominantly consisting<br />

of haploid hyphae (thin lines,onenucleus),somedikaryotichyphae(thick lines,twonuclei)<br />

and differently matured asci within the hymenium. As-, An ascogonium and antheridium<br />

before gametangiogamy, As+ fertilized ascogonium<br />

ascus is usually tube-shaped (“tube fungi”). The non-flagellate ascospores<br />

disper after disintegration of the ascus or via different opening mechanisms.<br />

The ascospores are mono-nuclear or after further mitosis multi-nuclear. They<br />

can be septate and show similar conidia characteristics of size, shape, color<br />

and wall sculpturing.<br />

The relatively small fruit bodies (less than 1 mm in diameter) of the woodinhabiting<br />

Ascohymeniales are the spherically closed cleistothecium, the pear-<br />

Fig.2.14. Fruit body types of Ascomycetes. P perithecium, A apothecium, C cleistothecium<br />

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