Scientific name: Nitellopsis obtusa
What Is It?
Starry stonewort (Nitellopsis obtusa) is an aquatic, grass-like alga that spreads rapidly and alters water chemistry. It may be found in both freshwater and estuarine environments.
Is It Here Yet?
No. However, it is a very harmful invasive species elsewhere in the United States, such as in Michigan, and can spread on boats that are not cleaned properly before traveling between water bodies. It also can be spread by waterfowl.
Why Should I Care?
Starry stonework grows densely, covering the sediment and forming mounds of vegetation up to six feet tall. It can outcompete other aquatic plants and harm wildlife habitat by reducing cover and food sources. It impacts the environment by absorbing phosphorous and changing the chemistry of sediment. It can smother fish spawning grounds and reduce habitat diversity. The dense vegetation mats also reduce opportunities for boating, swimming, and other recreational activities.
How Can We Stop It?
Do not purchase, plant, or trade this species. Dispose of aquarium contents appropriately. Before launching a boat, be sure to check boats, trailers, and motors to ensure there are no plant fragments that may spread.
What Are Its Characteristics?
- Grows 6-8 feet tall and wide. It can grow up to 33 inches long, but grows in dense tangled mounds when established.
- The distinguishing characteristic is the 6-pointed, star-shaped, white bulbil (a small bulb-like structure) at stem junctions. These are especially common at the base and can be found during all times of the year.
- Its blunt-tipped branchlets grow in whorls of 4 to 6. The branchlets are uneven in length, unlike native plant-like algae.
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