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The idea for this guide, Freshwater Algae in Northwest Washington, began in 2006 when the Institute for Watershed Studies ( expanded its Northwest Lakes monitoring project to collect water quality samples from more than 70 local lakes. This volume, Chlorophyta and Rhodophyta, is part of a series describing freshwater algae in Northwest Washington, and includes simple algal keys that can be used by students with little experience in taxonomy, as well as members of the general public. In addition to freshwater Chlorophyta and Rhodophyta, this volume includes non-desmid members of the division Charophyta, which would be difficult for beginning taxonomists to separate from Chlorophyta. Desmids, the remaining members of Charophyta, will be discussed in Volume III. Although the emphasize is on freshwater lakes, samples collected in streams, seeps, waterfalls, and other lotic systems are included, with comments on whether the taxa are likely to be found in plankton samples.

Publication Date



Institute for Watershed Studies, Huxley College of the Environment, Western Washington University


Bellingham, WA


Freshwater algae, Chlorophyta, Rhodophyta, Algae identification, Washington State algae


Environmental Monitoring | Environmental Sciences


This work is licensed under the Creative Commons Attribution-NonCommercial- NoDerivatives 4.0 International License. To view a copy of this license, visit

Subjects - Topical (LCSH)

Freshwater algae--Washington (State)--Identification

Geographic Coverage

Washington (State)

OCLC number


Digital Format


Freshwater Algae in Northwest Washington, Volume II, Chlorophyta and Rhodophyta