Guide to diatoms in the mountain lakes in the Retezat Mountains, South Carpathians, Romania. 2016.(Studia Botanica Hungarica,47, Supplement). 85 plates (LM & SEM). 214 p. gr8vo. Paper bd.

This book is a well-structured, high standard guide to the diatom flora of the glacial lakes of the Retezat Mountains, in the South Carpathians.

Until now there was a gap in the investigations of diatom flora of the Romanian part of the Carpathians. Consequently,it is a proper contribution towards the better understandingof the diatom diversity of these Mountains.

As it is mentioned above, this is a high standard book because it includes a detailed map and description about the study area. Furthermore, there have been many light and electron micrographs attached whichhelp the readers to be able to make the best of it during their work.It also emphasises the importance of this work that it is the first illustrated guide (based on 752 LM and 188 SEM pictures) to the diatom flora of the glacial lakes of the Retezat Mountains, in the South Carpathians.

This compilation comprises all previously published data extending back to 2008. However, it focuses on small-celled diatoms. The main aim of this study is to contributeto the hardly visible, lightly silicified and recently described forms, instead of repeating the earlier published data. A further aim of this work is to provide a revised taxon list (checklist) of diatoms from the Retezat Mountains as a summary of the already publisheddata. Altogether (with the previous data) 217 diatom taxa have been identified. New Humidophila and Staurosira taxa are also presented and a new combination is proposed for Achnanthes helvetica var. minor.