Diatoms of Southwestern USA,II:Diatoms of the Colorado River in Grand Canyon National Park and Vicinity.1978. (Reprint 2009, Bibliotheca Phycologica, 38). 27 plates. 182 p. Hardcover

From the introduction:This report includes collections made during 1976 on six float trips down the Colorado River from Lee's Ferry toDiamond Creek.A total of 27 major sites and tributaries were sampled seasonally as well as the main Colorado River and numerous canyon wallseeps.This report on the Grand Canyon includes descriptions of 235 taxar epresenting 42 genera of diatoms.Also included by name are other taxa that are known to occur in Arizona as reported by various authors (Hostetter,1968;Olsen and Sommerfeld,1970;Button and Blinn,1973;Johnsonet al.,1975;Sommerfeld et.al.,1975;Czarnecki and Blinn,1977)which have not as yet been reported from the Grand Canyon system.The index therefore ,is thought to be an up-to-date diatom flora list of Arizona,USA.The report also includes a brief glossary of routinely employed ecological and morphological terms,illustrated where appropriate.Ultimate taxa observed in this study may be identified with the aid ofthe ordinal,familial,generic and ultimate keys.In addition,directly below each described taxonomic entry there is an appropriate published reference,which in most cases was employed for the determination of that taxon.