Diatoms of Montana and western North America.: catalog and atlas of species in the Montana Diatom Collection. 2021. (Academy Nat. Sc. of Philadelphia, Special publication, 24). 204 plates. 512 p. 4to. Paper bd.

This is the first volume of the diatom flora of Montana and adjacent areas that Loren Bahls put together to illustrate his collection, which will reside at the Diatom Herbarium of the Academy of Natural Sciences, Philadelphia (ANSP) and at the at the University of Montana Herbarium in Missoula (MONTU).

"Diatoms of Montana" is an example of a compendium of fine light microscope illustrations accompanied by well-documented collection data and physical materials deposited in public herbaria that can enable future investigations in diatom ecology and biogeography. This book summarizes a great deal of the current knowledge of freshwater diatoms of Montana. More volumes to follow.