Jelly Fungus Fruiting
The term “jelly fungus” is an informal one applied to species of fungi that have a gelatin-like consistency. The reason for this texture is that the structural filaments, or hyphae, of these fungi have walls that are not thin and rigid as they are in most other species, but instead shrink and expand in response to moisture. The hyphae are expanded and gelatinous when moist, but during dry periods they collapse and become rather hard and resistant to bending. These tissues are able to exist in a dry state for many months and, when exposed to moisture, quickly expand to full size. They may be among the earliest fungi seen in the spring because they have remained dry and inconspicuous all winter, only to revive with the first melting snow or during winter thaws. Jelly fungi come in several colors. Some of the orange and yellow forms found growing on deciduous trees, especially oaks and beech, are called “witches’ butter.”
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