Overview
The White Nest Fungus (Nidula candida) is a delightfully whimsical, miniature gasteromycete native to the mossy, rain-soaked temperate rainforests of the Pacific Northwest. Resembling a perfect, microscopic ceramic birds’ nest cradling tiny white ‘eggs’ inside an elegant cup, this fascinating wood-decay fungus utilizes an ingenious, hydro-ballistic splash-cup mechanism that harnesses the kinetic energy of falling raindrops to launch its spores meters through the forest.
Biology and Physical Characteristics
Nidula candida produces miniature, cylindrical to vase-shaped fruiting bodies measuring less than a centimeter across. The outer cup surface is covered in velvety, woolly white to pale buff hairs, opening at maturity to reveal a smooth, lustrous, silvery-white interior chamber. Resting inside the cup are 6 to 10 flattened, disc-shaped lenticular peridioles (‘eggs’) colored light grey or pale buff, suspended in a clear, water-soluble gelatinous matrix.
Behavior and Ecology
An obligate saprotroph, the White Nest Fungus decomposes dead branches, decaying bark, and woody forest floor debris of western hemlock, Douglas fir, and red cedar. When a heavy raindrop strikes the sloped interior wall of the splash cup at high speed, the water droplet ricochets violently upward, ejecting the egg-like peridioles up to a meter away into surrounding moss, where they stick to vegetation and release spores.
Conservation and Human Impact
While not formally assessed on the global IUCN Red List, Nidula candida is abundant and common throughout old-growth and mature temperate rainforests of coastal Washington, Oregon, and British Columbia. It plays an essential role in recycling woody lignin and enriching forest floor humus.
Interesting Factoid
The White Nest Fungus functions like a biological catapult: when a single falling raindrop hits the angled interior wall of the cup, it creates a hydraulic shockwave that launches the spore ‘eggs’ flying three feet through the air to colonize new deadwood.