Edited by Andrzej Witkowski. Volume 19: Reavie, Euan D. and Norman A. Andresen: Monoraphid and Naviculoid diatoms from the Coastal Laurentian Great Lakes. 2nd rev. ed. 2020. 33 pls. 333 p. gr8vo. Hardcover. (ISBN 978-3-946583-31-8)

This volume contains two monographs. It offers 30 additional pages of text compared to the first edition.

1) Monoraphid Diatoms from the Coastal Laurentian Great Lakes, by Euan D. Reavie (18 plates. 109 p.)

This monograph contains descriptions of taxa from the diatom genera Achnanthes, Achnanthidium, Platessa, Psammothidium, Rossithidium, Planothidium, Karayevia, Eucocconeis, Cocconeis and Rhoicosphenia from periphytic and surface sediment samples in the coastal ecosystems of the Laurentian Great Lakes. We provide light micrographs of diatom taxa recorded in 207 samples from 106 wetlands, embayments, high-energy and deep, nearshore locales of the five Great Lakes.

We characterize 79 taxa and name two previously undescribed taxa. For the 50 more common taxa we characterized lake and habitat specificity, modeled optima for phosphorus and chloride and tolerance to coastal anthropogenic stressors.

2) Navicula from the Coastal Laurentian Great Lakes, by Euan D. Reavie and Norman A. Andresen (15 plates, 221 p.)

This monograph contains descriptions of taxa from the diatom genus Navicula and some closely related taxa from the coastal ecosystems of the Laurentian Great Lakes. We provide light micrographs of diatom taxa recorded in 207 samples from 106 wetlands, embayments, high-energy and deep, nearshore locales of the five Great Lakes. Diatoms were identified from periphytic and surface sediment samples. The taxonomic and iconographic sections of this book include descriptions and illustrations of the taxa encountered, as well as autecological information when available. 26 new species are described.

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