Great photos of a Mushroom Cap Jelly. While not all jellyfish sting; many are harmless to humans, but it is always best to avoid touching them. Size & Shape. The mushroom cap jellyfish is an uncommon visitor into lower Chesapeake Bay during the fall and early winter. Mushroom jellies tend to make appearances in the late fall into the winter. Laterally, the species has a reddish-brown pigmentation from the organs underneath such as the pinkish digestive glands. This aptly named jellyfish does not have the fringe tentacles that other species do. Like the mushroom cap jelly, the cannonball jelly lacks tentacles around the outside of the swimming bell. Jellyfish tentacles can be very long, so avoiding the mushroom cap of doom is not enough. The bell is clear or translucent white and can grow to 20 inches in diameter. This jelly has no tentacles, but does have some appendages under the bell with brownish pigmentation. During a performance of her hit song “Levitating” on “SNL” this weekend, the 25-year-old singer got Twitter talking with her huge, feathered hat. They were sent in by H. Tiner. In Rehoboth, Buckson said the jellyfish that caused the most trouble is the mushroom cap jellyfish, which looks similar to the lion’s mane with its large, bright-colored bell, although mushroom cap jellies have shorter tentacles. Sting level: Low. Posts about mushroom cap jellyfish written by stingmate. The upside down jellyfish’s stinging cells are produced in a mucus that is released into the water when disturbed from the bottom. The sting is mild if felt at all. True Jellies without painful sting (have stinging cells to catch prey, just do not hurt when humans brush against them): Late summer/early fall: cannonball/cabbagehead jellies; Summer: moon jellies; Late fall/winter: mushroom cap jellies; Other jelly-like creatures, none of these cause a painful sting: Nettles. Dua Lipa is adding a new feather to her cap. In the first two photos, the jelly is upside-down. Dead and sand-covered jellies can still sting, so watch for those on the beach as well. Crown jellyfishes are the eight families of jellyfish that belong to the order Coronatae. Sting. Even if they do release the toxic mucus, it’s not so toxic. Mushroom Cap Jellyfish. As long as you do not disturb them too much they will not release the toxin filled mucus. Keep in mind that this is not a list of jellyfish that don’t sting—it’s a list of the types of jellyfish that aren’t dangerous to humans. Lion’s mane jellyfish are distinctive for their red-tinted bell. The most frequent culprit behind jellyfish stings on the OBX is the nettle. The types of jellyfish you might run into at Folly include the cannonball jelly, lion’s mane jelly, mushroom jelly, southern moon jelly, and sea nettle – none of which represent a real hazard to humans, although they do pack a painful punch. 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