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Orange Goo At Alaskan Village Found To Be Fungal Spores, Not Eggs

This sample of orange goo has been identified as a mass of rust fungus spores.
This sample of orange goo has been identified as a mass of rust fungus spores.

The orange goo that took over the shore of a remote Alaskan village is actually a mass of fungal spores — not microscopic eggs, as scientists at the National Ocean and Atmospheric Administration first believed.

A single "uredo"-spore from the Alaskan sample, as seen in a closeup via scanning electron microscope.
/ NOAA
A single "uredo"-spore from the Alaskan sample, as seen in a closeup via scanning electron microscope.

But researchers are not yet sure whether this particular type of rust fungus is one of the 7,800 species of rust fungi that have already been identified. For one thing, its spores have unusual spines covering their surface.

"At this point, the best identification we can give to as the origin of these spores is a rust fungus," says Steve Morton, Ph.D., who works in the NOAA lab in Charleston, S.C., that conducted the full analysis. "The spores are unlike others we and our network of specialists have examined; however, many rust fungi of the Arctic tundra have yet to be identified."

Samples of the orange substance were sent to labs at NOAA's Alaska Fisheries facility, which initially determined that the goo was actually a mass of microscopic eggs, and to NOAA's National Ocean Service Center for Coastal Environmental Health and Biomolecular Research in Charleston.

Scientists at the South Carolina facility who analyzed the microbiological phenomena with electron scanning microscopes and other equipment "determined that the substance is consistent with spores from a fungi that cause rust," according to a NOAA press release.

NOAA says that the disease "infects only plants, causing a rust-like appearance on leaves and stems. Rust fungi reproduce to infect other plants by releasing spores which disperse, often-times great distances, by wind and water."

The agency says it will release more information about the fungal spores as its Analytical Response Team continues to examine the samples sent from Alaska.

Copyright 2021 NPR. To see more, visit https://www.npr.org.

A photo taken on Aug. 3 shows an orange mass floating on the water at Kivalina, Alaska. Samples of the "goo" were sent to NOAA for analysis — and determined to be fungal spores, not microscopic eggs.
/ AP
A photo taken on Aug. 3 shows an orange mass floating on the water at Kivalina, Alaska. Samples of the "goo" were sent to NOAA for analysis — and determined to be fungal spores, not microscopic eggs.