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This volume presents a revision of the Caloplaca saxicola group (Teloschistaceae, Ascomycetes) of the northern Hemisphere. The revision is based on the study of morphological and anatomical characteristics of approximately 650 specimens and their relevant type material. The specimens and type material studied are documented in drawings of microscopic structures and photos of thallus habit and apothecia. Furthermore the author presents a key to the taxa covered by this study. A statistical analysis was conducted to verify the significance of the spore characters for identification and completes this study. As a result of this revision, the following taxa are now part of the C. saxicola group: Caloplaca arnoldii (Wedd.) Zahlbr.; C. arnoldii subsp. clauzadeana Gaya; C. arnoldii subsp. nana Gaya; C. arnoldii subsp. obliterata Gaya; C. arnoldiiconfusa Gaya & Nav.-Ros.; C. biatorina (A. Massal.) J. Steiner; C. decipiens (Arnold) Blomb. & Forssell; C. pseudofulgensia Gaya & Nav.-Ros.; C. pusilla (A. Massal.) Zahlbr.; C. rouxii Gaya, Nav.-Ros. & Llimona; C. saxicola (Hoffm.) Nordin; and C. schistidii (Anzi) Zahlbr.

With well over 2000 species the Parmeliaceae is the largest family of lichenized fungi. Mexico with its huge topographic relief and wide range of habitats is one of the major biodiversity hot spots in the world. Accordingly, it is not surprising that this volume documents over 20% of the world's Parmeliaceae from this country. In fact a vast majority of the Parmeliaceae known from North America are covered in this volume. Descriptions (morphological and chemical), keys, distribution information and extensive specimen citations covering all states in Mexico are provided in the systematic treatments covering 450 species from Alectoria, Anzia, Bryoria, Bulbothrix, Canoparmelia, Cetraria, Cetrelia, Hypotrachyna, Flavoparmelia, Hypogymnia, Imshaugia, Kaernefelita, Letharia, Melanelixia, Melanohalea, Menegazzia, Montanelia, Myelochroa, Nodobryoria, Oropogon, Parmelia, Parmelina, Parmelinella, Parmeliopsis, Parmotrema, Parmotremopsis, Phacopsis, Protoparmelia, Pseudephebe, Pseudevernia, Pseudoparmelia, Punctelia, Relicina, Remototrachyna, Tuckermanella, Tuckermannopsis, Usnea, and Xanthoparmelia. Keys to genera are based on the most recent molecular data. All the species of Parmotrema known for North America are covered in the keys. The book begins with a review of the physiographic aspects and biodiversity of Mexico and proceeds to the first lichen community phylogenetic analysis for the major ecological communities in Mexico based on the Parmeliaceae. The book will be useful to anyone studying the lichens of Mexico as well as adjacent regions in Central America, the Caribbean, and the United States.

The second revised edition of this manual aims at providing students and less experienced professional aquatic biologists with a key to identify some to the more commonly encountered aquatic freshwater algal genera of the United States. In response to reviewers comments, a brief section on diatoms, a section providing a number of possible of dispositions of the genera into a taxonomic hierarchy and a brief glossary of technical terms have been added in this revised edition. A number of nomenclatural changes is reflected as well.Keys, representative illustrations and general ecological notes are provided for some 300 genera, excluding the diatoms (except for a brief section on them). The keys are based on features observable in freshly collected material.