22.12.2012 Views

6 Wood Discoloration

6 Wood Discoloration

6 Wood Discoloration

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

12 2 Biology<br />

Fig.2.5. Appressorium and transpressoria of blue-stain fungi in wood. a Hyphae (H) of<br />

Ophiostoma piceae in the luminina (L) of a pine tracheid. A appressorium, T boring canal<br />

through the activity of a transpressorium, C wood cell wall. (LM, from Liese and Schmid<br />

1962); b Two transpressoria (EM, from Liese and Schmid 1966)<br />

Strands (cords) (Fig. 2.6) develop in a number of house-rot fungi and usually<br />

consist of three hyphal types, vegetative hyphae, thin fiber (skeletal) hyphae<br />

with mostly thick walls for strengthening, and broad vessel hyphae for nutrient<br />

transport (Nuss et al. 1991). These hyphae form a distinct mycelium in the longitudinal<br />

direction, which is, however, not so well organized like the tissue-like<br />

structure of the rhizomorphs. Also in contrast to rhizomorphs, strands develop<br />

behind the mycelial growth front. Particularly Serpula lacrymans overgrows<br />

larger distances of non-woody substrates and penetrates through masonry<br />

www.taq.ir

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!