2,745 research outputs found
New cercosporoid fungi from southern Africa
No full textSeven cercosporoid fungi are newly described from leaf spots on various plants in South Africa. An eighth species, Stigmina dieramae Crous & B, Sutton is described from leaf spots on a Dierama K. Koch species collected in Lesotho. Cercostigmina ekebergiae Crous & B. Sutton is newly described from Ekebergia Sparrm., while a new coelomycete genus, Phaeophloeosporella Crous & B. Sutton, is described as the pigmented analogue of Phloeosporella Höhn. to accommodate Cercosporella ekebergiae Syd. Additional species treated are Cercospora lotononidis Crous & B. Sutton on Lotononis bainesii Bak., Passalora tecomariae Crous & B. Sutton on a Tecomaria Spach species, Phaeoramularia digitariae Crous & B. Sutton on Digitaria diagonalis (Nees) Stapf, Pseudocercospora capensis Crous & B. Sutton on Cunonia capensis L. and Pseudocercospora eucleae Crous & B. Sutton on Euclea undulata Thunb
New cercosporoid fungi from southern Africa
No full textSeven cercosporoid fungi are newly described from leaf spots on various plants in South Africa. An eighth species. Stigmina dieramae Crous and B. Sutton is described from leaf spots on a Dierama K. Koch species collected in Lesotho. Cercostigmina ekebergiae Crous and B. Sutton is newly described from Ekebergia Sparrm., while a new coelomycete genus, Phaeophloeosporella Crous and B. Sutton, is described as the pigmented analogue of Phloeosporella Hohn. to accommodate Cercosporella ekebergiae Syd. Additional species treated are Cercospora Iotononidis Crous and B. Sutton on Lotononis bainesii Bak., Passalora tecomariae Crous and B. Sutton on a Tecomaria Spach species, Phaeoramularia digitariae Crous and B. Sutton on Digitaria diagonalis (Nees) Stapf, Pseudocercospora capensis Crous and B. Sutton on Cunonia capensis L. and Pseudocercospora eucleae Crous and B. Sutton on Euclea undulata Thunb.Articl
A comparison of the fungal genera Phaeophleospora and Kirramyces (coelomycetes)
No full textPhaeophleospora eugeniae Rangel, the type species of Phaeophleospora Rangel, has recently been collected and cultured from leaf spots of Eugenia uniflora L. in Brazil. Based on its brown, verruculose, percurrently proliferating conidiogenous cells, conidiomatal anatomy and conidial morphology, Phaeophleospora is resurrected as the earlier name for the recently established coelomycete genus, Kirramyces J. Walker, B. Sutton & I. Pascoe. New combinations are proposed for the seven former species of Kirramyces, namely P. destructans (W. J. Wingf. & Crous) Crous, F.A. Ferreira & B. Sutton, P. epicoccoides (Cooke & Massee) Crous, F.A. Ferreira & B. Sutton, P. eucalypti (Cooke & Massee) Crous, F.A. Ferreira & B. Sutton, P. hebes (W. Wu, B, Sutton & A.C. Gange) Crous, F.A. Ferreira & B. Sutton, P. lilianiae (J. Walker, B. Sutton & I. Pascoe) Crous, F.A. Ferreira & B. Sutton, P. proteae (B. Sutton) Crous, F.A. Ferreira & B. Sutton and P. phormii (Naito) Crous, F.A. Ferreira & B, Sutton combs, nov
A comparison of the fungal genera Phaeophleospora and Kirramyces (coelomycetes)
No full textPhaeophleospora eugeniae Rangel, the type species of Phaeophleospora Rangel, has recently been collected and cultured from leaf spots of Eugenia uniflora L. in Brazil. Based on its brown, verruculose, percurrently proliferating conidiogenous cells, conidiomatal anatomy and conidial morphology, Phaeophleospora is resurrected as the earlier name for the recently established coelomycete genus, Kirramyces J. Walker, B. Sutton and I. Pascoe, New combinations are proposed for the seven former species of Kirramyces, namely P. destructans (W. J. Wingf. and Crous) Crous, F.A. Ferreira and B. Sutton, P. epicoccoides (Cooke and Massee) Crous, F.A. Ferreira and B. Sutton, P. eucalypti(Cooke and Massee) Crous, F.A. Ferreira and B. Sutton, P. hebes (W. Wu, B. Sutton and A.C. Gange) Crous, F.A. Ferreira and B. Sutton, P. lilianiae (J. Walker, B. Sutton and I. Pascoe) Crous, F.A. Ferreira and B. Sutton, P. proteae (B. Sutton) Crous, F.A. Ferreira and B. Sutton and P. phormil(Nalto) Crous, F.A. Ferreira and B. Sutton combs. nov.Articl
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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