J. Johansen

Publications177
h-index42
Citations6,259
Highly Influential Citations334
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Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach
TLDR
The status of all currently used families of cyanobacteria are presented, the results of molecular taxonomic studies, descriptions and characteristics of new orders and new families and the elevation of a few subfamilies to family level are reviewed.
MOLECULAR AND MORPHOLOGICAL CHARACTERIZATION OF TEN POLAR AND NEAR‐POLAR STRAINS WITHIN THE OSCILLATORIALES (CYANOBACTERIA) 1
An approximately 1400‐bp region of the 16S rRNA gene was sequenced for 10 polar or near‐polar strains putatively placed in the Oscillatorialean genera Oscillatoria, Phormidium, and Lyngbya obtained…
CRYPTOGAMIC CRUSTS OF SEMIARID AND ARID LANDS OF NORTH AMERICA
Microbiotic Crusts and Ecosystem Processes
TLDR
Greenhouse studies have found that crusts can enhance seed germination, seedling survivorship, and plant nutrient status, but further experiments are needed under field conditions.
Is the 16S-23S rRNA internal transcribed spacer region a good tool for use in molecular systematics and population genetics? A case study in cyanobacteria.
TLDR
This is the first report of ITS regions from a single cyanobacterial isolate not only different in configuration, but also, within one configuration, different in sequence.
A UNIQUE PSEUDANABAENALEAN (CYANOBACTERIA) GENUS NODOSILINEA GEN. NOV. BASED ON MORPHOLOGICAL AND MOLECULAR DATA 1
TLDR
Members of this clade possess both a morphological synapomorphy and shared 16S‐23S internal transcribed spacer (ITS) secondary structure, allowing the diagnosis of the new cyanobacterial genus Nodosilinea.
COLEOFASCICULUS GEN. NOV. (CYANOBACTERIA): MORPHOLOGICAL AND MOLECULAR CRITERIA FOR REVISION OF THE GENUS MICROCOLEUS GOMONT 1
TLDR
Cyanobacterial species currently classified within the cyanobacterial genus Microcoleus were determined to fall into two distinct clades in a 16S rDNA phylogeny, one containing taxa within the Oscillatoriaceae, the other containing taxas within the Phormidiaceae, and the new genus Coleofasciculus is proposed.
Morphological and molecular characterization of selected desert soil cyanobacteria: three species new to science including Mojavia pulchra gen. et sp. Nov.
TLDR
Four Nostocacean species from desert soils of the western United States, including the phycobiont of the lichen Collema tenax, were studied and phylogenetic analysis indicated that they belonged in separate, distinct, and previously undescribed taxa.
Seven new species of Oculatella (Pseudanabaenales, Cyanobacteria): taxonomically recognizing cryptic diversification
TLDR
This report is the first to use solely molecular criteria to distinguish cryptic species of cyanobacteria using molecular characters in the genus Oculatella from all four soil taxa.
Molecular and morphological criteria for revision of the genus Microcoleus (Oscillatoriales, Cyanobacteria)
TLDR
The main diacritical characters defining Microcoleus are related to the cytomorphology of trichomes, including: narrowed trichome ends, calyptra, cells shorter than wide up to more or less isodiametric, and facultative presence of sheaths.
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