Scientific name: Kretzschmaria deusta
(Hoffm.) P.M.D. Martin
Derivation of name: Deusta means "burned up" in reference
to the charred appearance of the fungus.
Synonyms: Sphaeria deusta Hoffm.; Ustulina deusta
(Hoffm.) Lind
Common name(s): Carbon cushion
Phylum: Ascomycota
Order: Xylariales
Family: Xylariaceae
Occurrence on wood substrate: Saprobic; forming crust-
like sheets on stumps and dead roots of deciduous trees; year-
round.
Dimensions: Fruitbody 4-10 cm wide, 3-5 mm thick,
forming sheets up to 50 cm long that are irregular in shape.
Description: Fruitbodies at first grayish-white, soft and
powdery. This stage is the asexual stage. With maturity, the
fruitbody becomes hard, black, and finely roughened with the
bumplike pores of perithecia embedded in a whitish flesh.
These crust-like fruitbodies are brittle and easily detached from
the wood.
Edibility: Inedible.
Comments: At maturity, this fungus resembles burnt wood.
More information at MushroomExpert.com
Figure 1. Occurrence of Kretzschmaria deusta on dead
wood. Photo © Patrick Harvey.
Figure 2. An award-winning photograph of
Kretzschmaria
deusta illustrating the grayish-white asexual stage of the
fungus.
Photo © Patrick Harvey.
Figure 3. The asexual stage of Kretzschmaria
deusta.
Photo © Steve Nelsen.
Figure 4. Immature (asexual) and mature (sexual) stages of
carbon cushion. In contrast to the soft, grayish-white
asexual stage, the sexual stage is black and crust-like.
Photo © William Roody.
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Figure 5. The black sexual stage of carbon cushion.
Photo ©
Joanne Solem.
Figure 6.
The rough, lumpy
black sexual (perithecial) stage
stage of carbon cushion is easily detached
from the
wood
substrate.
Photo © Gary Emberger.
Figure 7.
A closer view of the rough surface reveals the
presence of numerous pimple-like bumps.
Photo © Gary Emberger.
Figure 8. The bumps of Figure 7 are the
pore-like openings
of perithecia embedded just under the
surface.
Within
each perithecium are asci with ascospores.
Photo © Gary Emberger.
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