The Muskegon Chronicle reports that lyme grass (an invasive species) is spreading and threatens to displace native dune grass (marram grass). Lyme grass has bigger seeds, tougher blades and a stiffer seed stalk and has been spotted at the Nordhouse Dunes Wilderness Area north of Ludington, at Mount Pisgah near Holland, and at the Sleeping Bear Dunes National Lakeshore.

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