The damage is shown by wood darkening with cracks along and across grain, but usually less deep than those
caused by Serpula Lacrymans. Where conditions cause drying of the wood surfaces, an apparently sound skin of timber
often remains which may crack longitudinally as the decay progresses beneath. Freshly colonised wood usually shows a yellow discolouration.
Mycellium is only present in conditions of high humidity and rarely without brown strands.
Cream to brownish in colour; off-white under previous floor coverings.
It may spread superficially over damp plaster or brickwork.
Strands are thin, usually brown or black, though yellowish when young.
Fruit Bodies are rare in buildings. They are thin, lying flat on substrate and with small irregular lumps.
Olive green to olive brown with cream margin; paler when young.
What is Dry Rot?
The common name for dry rot is Dry Rot Fungus - mostly found in softwoods.
It is a major building decay fungus, often causing extensive damage.
A brown rot which typically occurs on wood embedded in, or in
contact with, wet brickwork. Dry rot is sensitive to high temperatures
(over 25 degrees C) and drying, and therefore rarely found on
exposed timbers or in situations where fluctuating conditions are
likely (e.g. well ventilated subfloors and roofing timbers).
It's able to grow through bricks and mortar, although it cannot feed on them.
Strands can transport moisture from damp areas, allowing the spread of the
fungus to dry wood in unventilated conditions. An appearance of fruit-bodies
may be the first indication of outbreak.
The mycellium are silky white sheets or cotton wool-like white cushions with patches of lemon yellow or lilac tinges where exposed to light. In less humid
conditions, it forms a thin, felted grey skin. During active growth the advancing hyphal edge forms a silky fringe. It tears in the direction of the growth and is brittle when dry.
The strands are white to grey, branching, and are sometimes as thick as a pencil - also brittle when dry.
Fruit bodies are usually found on wood-wall joints and are rare on exteriors of buildings. They are tough fleshy, pancake or bracket-shaped with a yellow ochre
centre when young, darkening to a rusty red when mature owing to spore production. They are covered with shallow pores or folds and the edges are white or grey.
Spores are profuse and may settle as fine layer of reddish brown dust on horizontal surfaces.