Invasive Species Compendium - Didymosphenia geminata
New York Invasive Species Information - Rock Snot, Didymo
New York Invasive Species Clearinghouse.
NEANS Panel Online Guide - Didymo (a.k.a. rock snot)
Northeast Aquatic Nuisance Species Panel.
Global Invasive Species Database - Didymosphenia
IUCN. Species Survival Commission. Invasive Species Specialist Group.
Invasive Species: Didymo a.k.a. "Rock Snot" (Apr 2010; PDF | 142 KB)
DOI. NPS. Yosemite National Park.
Didymosphenia geminata in
British Columbia Streams
British Columbia Ministry of Environment (Canada).
Environment Bay of Plenty Regional Council (New Zealand).
New Zealand Ministry of Agriculture and Forestry. Biosecurity
Otago Regional Council (New Zealand).
Nuisance Species Threatens Maine streams and
Rivers: Didymo or "Rock Snot"
Maine Department of Environmental Protection. Bureau of Land and Water
New York Department of Environmental Conservation.
Invasive Plants in Pennsylvania: Didymo (PDF | 153 KB)
Pennsylvania Department of Conservation and Natural Resources.
See also: Invasive Plants fact sheets (scroll to view) for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands
AIS Action Plan: Didymo (Jun 2011; PDF | 193 KB)
Pennsylvania Fish and Boat Commission.
Didymo (Invasive Freshwater
Algae) in Virginia
Virginia Department of Game and Inland Fisheries.
(Rock Snot) Fact Sheet
West Virginia Department of Natural Resources.
Didymo (or Rock Snot)
University of California, Riverside. Center for Invasive Species Research.
How Didymo Became Rock Snot (Dec 2009)
University of Minnesota. Minnesota Sea Grant. Seiche Newsletter.
Fact Sheet: Didymo (PDF | 211 KB)
Pennsylvania State University. Pennsylvania Sea Grant.