Appearance
During the reproductive phase of its life cycle, "Spinellus fusiger" grows throughout the cap of the mushroom host, eventually breaking through to produce radiating reproductive stalks bearing minute, spherical, terminal spore-containing structures called sporangia. Ultimately, the spores in the sporangia are released after the breakdown of the outer sporangial wall, becoming passively dispersed to new locations via wind, water, and insects. The sporangia contain non-motile mitospores known as aplanospores. Like other "Spinellus" species, "S. fusiger" is homothallic, a condition where sexual zygospores can be produced union of branches from the same mycelium and so can be produced by the growth from a single spore.
Behavior
It grows as a parasitic mold on mushrooms, including several species from the genera "Mycena", including "M. haematopus", "M. pura", "M. epipterygia", "M. leptocephala", and various "Collybia" species, such as "C. alkalivirens", "C. luteifolia", "C. dryophila", and "C. butyracea". It has also been found growing on agaric species in "Amanita", "Gymnopus", and "Hygrophorus".References:
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