|Cup fungi are the
spore shooters of the fungus world. Their spores develop inside a
sac-like structure known as an ascus. Fluid pressure builds up inside the ascus as the
spores mature, eventually reaching the point where the top of the ascus is blown off. The
spores are then ejected away from the fruiting body by the sudden release of pressure.
There are various different mechanisms for releasing the pressure at the top of the asci.
This may include such features as a lid or operculum which lifts when the pressure can no
longer be contained.
Slight differences in the moisture
content of the air, temperature, light and air currents will all affect spore release from
the asci on a fruiting body. It may be possible to actually see spores puffing out from
the asci and hear a small pop as they explode open. Spores may be shot out distances of up
to 30 cm, which considering the microscopic size of the asci is a staggering feat. Once
the spores have been shot out into the air surrounding the fruiting body, they will then
be carried away by air currents.
Another fungus which employs pressure to disperse its spores is
called Pilobolus. For a description of spore dispersal in this fungus, click here.
|Fungi such as stinkhorns
use insects to disperse their spores. The stinkhorn fruiting body has a slimy spore mass
which smells like carrion. This attracts insects which normally feed on carrion,
particularly flies and as they walk around in the spore mass, spores stick to their feet
and bodies. When they fly away, the spores will be transferred to other places.
Ink Caps use a quite
different method to disperse their spores. They are gill fungi in which the gills break
down as they mature. This results in a dripping black inky fluid containing the spores. At
one time this fluid was used as ink, giving these fungi their common name.
Bird's Nest fungi produce fruiting bodies which resemble a bird's
nest. These are hollow structures containing small hard packets of spores called
peridioles. Rain drops in heavy storms splash into the 'nest' structure ejecting the
peridioles some distance from the fruiting body.