Washington Invasive Species Counsil

Photo: Minnesota Department of Natural Resources Photo: Michigan Lake and Stream Associations What is it? Starry stonewort is an aquatic, grass-like algae that spreads rapidly and alters water chemistry. It can be found in both freshwater and estuarine environments....

Aquatic Invasive Species Quick Guide

Description: Starry stonewort is a non-native species of large algae in the Characeae family. It has whorls of 4-6 long branchlets. It is more robust than most members of its family, and can grow to over two meters tall. Anchored by colorless filaments (rhizoids) that...

USGS – Nonindigenous Aquatic Species

Nonindigenous Aquatic Species guide from the USGS. Means of Introduction: Nitellopsis obtusa was very likely introduced in ballast water to the Great Lakes (Mills et al. 1993, Schloesser et al. 1986). Nitellopsis obtusa produces oocytes that can...

Department of Natural Resources

Appearance Starry stonewort is a bushy, bright green macro-algae. It produces a characteristic star-shaped bulbil. Leaves and Stem Thin, bright green branchlets (branch-like structures) can be variable in length and are arranged in whorls (radiating out from a single...

Why a Minnesota Lake Has Become a Giant, Living Laboratory

September 30, 2018 10:42 PM A Minnesota lake has become a giant, living laboratory to study invasive plants. Starry stonewort was found for the first time in our state in Lake Koronis in 2015. The aquatic invader has now spread to 13 Minnesota lakes. Koronis is a...