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6 Wood Discoloration

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2.1 Cytology and Morphology 7<br />

The hyphal system expands by extension of individual hyphae that exhibit<br />

apical growth and by branching (Fig. 2.3).<br />

Different zones occur in the growing hypha (Fig. 2.4), which correspond to<br />

different ages and developmental stages (Huckfeldt 2003).<br />

Fig.2.3. Apical growth and hyphal branching system. One branch is sectioned to show<br />

the septum and some features of the protoplasm. N nucleus, ER endoplasmic reticulum,<br />

D dictyosome, V vacuole, M mitochondrion, Woronin bodies (dark) [reproduction with<br />

permission, from Jennings DH, Lysek G (1999) Fungal Biology, 2nd edn. Bios, Oxford,<br />

Fig. 1.1. page 6]<br />

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