1,721,184 research outputs found
Two new species and a new record of Lecanora sensu stricto (Lecanoraceae, Ascomycota) from India
No full textPapong, Khwanruan, Nayaka, Sanjeeva, Lumbsch, H. Thorsten (2012): Two new species and a new record of Lecanora sensu stricto (Lecanoraceae, Ascomycota) from India. Phytotaxa 68 (1): 24-28, DOI: 10.11646/phytotaxa.68.1.2, URL: http://biotaxa.org/Phytotaxa/article/view/phytotaxa.68.1.
FIGURE 3 in Identification of species in the Cladia aggregata group using DNA barcoding (Ascomycota: Lecanorales)
No full textFIGURE 3. Morphology of the new Cladia species. A) = C. blanchonii (Hayward 004635 [F]); B) = C. cryptica (holotype [F]); C) = C. tasmanica (holotype [HO]). Scale = 5 mm.Published as part of Parnmen, Sittiporn, Leavitt, Steven D., Rangsiruji, Achariya & Lumbsch, H. Thorsten, 2013, Identification of species in the Cladia aggregata group using DNA barcoding (Ascomycota: Lecanorales), pp. 1-14 in Phytotaxa 115 (1) on page 10, DOI: 10.11646/phytotaxa.115.1.1, http://zenodo.org/record/507899
Cladia neocaledonica Parnmen & Lumbsch, comb. nov.
No full textCladia neocaledonica (Räsänen) Parnmen & Lumbsch, comb. nov. Mycobank No.: 803446 Cladonia neocaledonica Räsänen (1944: 20). Type: NEW CALEDONIA. Wagap, 1863, Vieillard s.n. (lectotype H!, designated by Filson [1981]; isolectotypes CANB, H, KUO, TNS, US).Published as part of Parnmen, Sittiporn, Leavitt, Steven D., Rangsiruji, Achariya & Lumbsch, H. Thorsten, 2013, Identification of species in the Cladia aggregata group using DNA barcoding (Ascomycota: Lecanorales), pp. 1-14 in Phytotaxa 115 (1) on page 7, DOI: 10.11646/phytotaxa.115.1.1, http://zenodo.org/record/507899
A molecular perspective on generic concepts in the Hypotrachyna clade (Parmeliaceae, Ascomycota)
No full textDivakar, Pradeep K., Crespo, Ana, Núñez-Zapata, Jano, Flakus, Adam, Sipman, Harrie J.M., Elix, John A., Lumbsch, H. Thorsten (2013): A molecular perspective on generic concepts in the Hypotrachyna clade (Parmeliaceae, Ascomycota). Phytotaxa 132 (1): 21-38, DOI: 10.11646/phytotaxa.132.1.2, URL: https://www.mendeley.com/catalogue/df27a472-e3f0-3394-ae14-bd2cf1b78702
Genome-wide analysis of biosynthetic gene cluster reveals correlated gene loss with absence of usnic acid in lichen-forming fungi
Get PDFLichen-forming fungi are known to produce a large number of secondary metabolites. Some metabolites are deposited in the cortical layer of the lichen thallus where they exert important ecological functions, such as UV filtering. The fact that closely related lineages of lichen-forming fungi can differ in cortical chemistry suggests that natural product biosynthesis in lichens can evolve independent from phylogenetic constraints. Usnic acid is one of the major cortical pigments in lichens. Here we used a comparative genomic approach on 46 lichen-forming fungal species of the Lecanoromycetes to elucidate the biosynthetic gene content and evolution of the gene cluster putatively responsible for the biosynthesis of usnic acid. Whole-genome sequences were gathered from taxa belonging to different orders and families of Lecanoromycetes, where Parmeliaceae is the most well-represented taxon, and analyzed with a variety of genomic tools. The highest number of biosynthetic gene clusters was found in Evernia prunastri, Pannoparmelia angustata, and Parmotrema austrosinense, respectively, and lowest in Canoparmelia nairobiensis, Bulbothrix sensibilis, and Hypotrachyna scytodes. We found that all studied species producing usnic acid contain the putative usnic acid biosynthetic gene cluster, whereas the cluster was absent in all genomes of species lacking usnic acid. The absence of the gene cluster was supported by an additional unsuccessful search for ß-ketoacylsynthase, the most conserved domain of the gene cluster, in the genomes of species lacking usnic acid. The domain architecture of this PKS cluster-homologous to the already known usnic acid PKS cluster (MPAS) and CYT450 (MPAO)-varies within the studied species, whereas the gene arrangement is highly similar in closely related taxa. We hypothesize that the ancestor of these lichen-forming fungi contained the putative usnic acid producing PKS cluster and that the gene cluster was lost repeatedly during the evolution of these groups. Our study provides insight into the genomic adaptations to the evolutionary success of these lichen-forming fungal species and sets a baseline for further exploration of biosynthetic gene content and its evolutionary significance
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Hypotrachyna neodamaziana Divakar, A. Crespo, Sipman, Elix, comb. nov.
No full textHypotrachyna neodamaziana (Elix & J. Johnst.) Divakar, A. Crespo, Sipman, Elix & Lumbsch, comb. nov. MycoBank No.: MB 803591 Parmelina neodamaziana Elix & Johnston (1986: 155); Parmelinopsis neodamaziana (Elix & J. Johnst.) Elix & Hale (1987: 243).Published as part of Divakar, Pradeep K., Crespo, Ana, Núñez-Zapata, Jano, Flakus, Adam, Sipman, Harrie J. M., Elix, John A. & Lumbsch, H. Thorsten, 2013, A molecular perspective on generic concepts in the Hypotrachyna clade (Parmeliaceae, Ascomycota), pp. 21-38 in Phytotaxa 132 (1) on page 34, DOI: 10.11646/phytotaxa.132.1.2, http://zenodo.org/record/508604
Hypotrachyna nagalandica Divakar, A. Crespo, Sipman, Elix, comb. nov.
No full textHypotrachyna nagalandica (K. Singh & Sinha) Divakar, A. Crespo, Sipman, Elix & Lumbsch, comb. nov. MycoBank No.: MB 803590 Parmelina nagalandica K. Singh & Sinha (1993: 464); Parmelinopsis nagalandica (K. Singh & Sinha) Divakar & Upreti (2005: 288).Published as part of Divakar, Pradeep K., Crespo, Ana, Núñez-Zapata, Jano, Flakus, Adam, Sipman, Harrie J. M., Elix, John A. & Lumbsch, H. Thorsten, 2013, A molecular perspective on generic concepts in the Hypotrachyna clade (Parmeliaceae, Ascomycota), pp. 21-38 in Phytotaxa 132 (1) on page 34, DOI: 10.11646/phytotaxa.132.1.2, http://zenodo.org/record/508604
Hypotrachyna expallida Divakar, A. Crespo, Sipman, Elix, comb. nov.
No full textHypotrachyna expallida (Kurok.) Divakar, A. Crespo, Sipman, Elix & Lumbsch, comb. nov. MycoBank No.: MB 803585 Parmelia expallida Kurokawa (1968: 191); Parmelina expallida (Kurok.) Hale (1974a: 482); Parmelinopsis expallida (Kurok.) Elix & Hale (1987: 242).Published as part of Divakar, Pradeep K., Crespo, Ana, Núñez-Zapata, Jano, Flakus, Adam, Sipman, Harrie J. M., Elix, John A. & Lumbsch, H. Thorsten, 2013, A molecular perspective on generic concepts in the Hypotrachyna clade (Parmeliaceae, Ascomycota), pp. 21-38 in Phytotaxa 132 (1) on page 33, DOI: 10.11646/phytotaxa.132.1.2, http://zenodo.org/record/508604
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