A kind of mushroom · also called Hypomyces lactifluorum

2 views: its portrait, and how it looks in the comparison photos.
About
The lobster mushroom is an edible parasitic fungus that transforms host mushrooms into firm, softball-sized orange growths.
Because this fungus parasitizes other mushrooms, its final size depends heavily on the host species it infects. The parasite covers the host's surface and twists its shape, producing a much denser and heavier body than the original mushroom. Harvested specimens often vary from 3 to 6 inches (0.08 to 0.15 m) across as the outer fungal layer hardens the tissue.
From Wikipedia
Hypomyces lactifluorum, the lobster mushroom, is a parasitic ascomycete fungus that grows on certain species of mushrooms, turning them a reddish orange color that resembles the outer shell of a cooked lobster. The fungus is edible.
Read more on Wikipedia →Text from Wikipedia’s “Hypomyces lactifluorum” article, CC BY-SA 4.0.
1 on the site
Weight
7.05 oz (200 g)
Quick answer
A typical lobster mushroom stands about 4.7 inches (0.12 m) tall, measures 4.7 inches (0.12 m) across, and weighs 0.44 pounds (0.2 kg). This makes it roughly the size and weight of a softball.
Typical figures, the same ones every comparison on the site uses; real ones vary.
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