6 Wood Discoloration

212 8 Habitat of Wood Fungi
8.5.2
Lesser Common Basidiomycetes in Buildings
The following species description starts with some lesser common fungi and
ends with the most serious European fungus, the True dry rot fungus Serpula
lacrymans,inorderofatransitiontotheremedialtreatments.Daedalea
quercina, Gloeophyllum species, Lentinus lepideus and Paxillus panuoides,
which also occur in buildings, have been already described in Chap. 8.4. The following
data are based on observations and measurements in attacked buildings
and on genetically verified pure cultures on wood samples in the laboratory
(Huckfeldt 2003; Huckfeldt and Schmidt 2005; Huckfeldt et al. 2005; Schmidt
and Huckfeldt 2005), and were supplemented mainly from Grosser (1985),
Breitenbach and Kränzlin (1986), Ryvarden and Gilbertson (1993, 1994), and
Bravery et al. (2003).
8.5.2.1
Diplomitoporus lindbladii
Occurrence: circumpolar in the conifers zone, in Europe throughout the conifer
forest regions, but rare in the Mediterranean region, North America, also on
hardwoods;
Fruit body (Fig. 8.18a): annual to biannual, resupinate, becoming widely
effused (a few decimeters), up to 6 mm thick, biannual basidiomes thicker,
frayed margin, easily separable; upper surface white-cream, grey when old;
pore surface with 2–4 circular-angular pores/mm, to 3 mm deep; trimitic;
allantoid to cylindrical, hyaline spores (5–7 × 1.5–2µm); bipolar;
Strands (Fig. 8.18b): on timber in laboratory culture, white, yellowing when
dry, root-like, iceflower-like, similar to A. vaillantii; fiberssimilartoA. vaillantii,butsolublein5%KOH;
Significance: white rot, indoors.
8.5.2.2
Asterostroma cervicolor and A. laxum
Fruit body (Fig. 8.18c): resupinate, sheet-like, thin, whitish to ochre or cinnamon,
hardly distinguishable from mycelium; no pores; may be found on
masonry; spores warty (A. cervicolor), without warts (A. laxum); monomitic;
Strands and mycelium (Fig. 8.18d): cream-brown, up to 1-mm-wide strands
with a rough appearance, flexible when dry, sometimes across and inside masonry
over a long distance, brown strands often present next to fruit body,
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