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Honestly, if it was a fungus, I think there should be more of the same visible on the image. It is very rare, though not impossible to see a sigle mycelium with an apparent fruiting body. So my guess is that the object could well be a spermatophore.

"Mating
Collembola do not actually go in for conventional mating instead the males leave a spermatophore (a bag of sperm) where the females might find it, sometimes this is off the ground on a short stalk. This habit is feasible because many species tend to collect in groups, like small herds of miniature cattle, and thus the females are quite likely to find the spermatophores. A female will lay about 90 to 150 eggs during her life, though this also varies with species. The eggs take about a month to hatch at 8 degrees C but are quicker at warmer temperatures, Pogonognathellus plumbeus eggs hatch in 3-4 day at about 20 degrees C most will live for about a year. Some will live for a long time with out food, the longest I know of being 18 months for a single specimen on its own , though if the food runs out you will get cannibalism, particularly of eggs in some cultures and with some species."

Info from: http://www.earthlife.net/insects/collcare.html