Some new species and distribution records of <i>Rhizopogon</i> in North America

Harrison, Kenneth A.; Smith, Alexander H.

doi:10.1139/b68-117

Cited by 13 publications

(4 citation statements)

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“…described 137 Rhizopogon species in a preliminary account of North American species. Subsequent studies by Smith (1966Smith ( , 1968, Harrison & Smith (1968), Trappe & Guzman (1971), Hosford (1972) and have added 24 additional species.…”

Section: Taxonomy Of Rbizopogonmentioning

confidence: 99%

Biology of the ectomycorrhizal genus, Rhizopogon

1994

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SUMMARY Twenty nine isolates of Rhizopogon from 20 spp. differed markedly in their ability to form ectomycorrhizas with Douglas fir, western hemlock and lodgepole pine in pure‐culture syntheses, Within the four sections of Rhizopogon there were similarities in ectomycorrhizal appearance and range of potential hosts. Intermediate and overlapping ectomycorrhiza! characters were evident in closely related species complexes. Although the host‐specificity of many species, based on field observations of sporocarps, often correlated with their host range in the syntheses, some fungi formed well‐developed ectomycorrhiza on hosts with which they appear not to be associated in the field. The specificity of host associations is suggested as a major contributor to the speciation and diversification of Rhtzopogon in the Pacific Northwest of the USA and Canada.

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Section: Taxonomy Of Rbizopogonmentioning

confidence: 99%

Biology of the ectomycorrhizal genus, Rhizopogon

1994

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“…Later, Smith and Zeller ( 1966 ) produced the first modern account of the genus to North America including a total of 137 taxa, in which 128 were new for science. Since this paper, the Pacific Northwestern USA has been considered the greatest area of diversity of the genus (Hosford 1975 ; Molina et al 1997 ; Grubisha et al 2002 ), as well as other parts of the USA (Harrison and Smith 1968 ; Miller 1986 ). However, in posterior systematic studies undertaken in several part of the world, authors described new species in Mexico (Trappe and Guzmán 1971 , Cázares et al 1992 ), Tunisia (Pacioni 1984a ), China (Liu 1985 ), Japan (Mujic et al 2014 ), and different countries of Europe (Pacioni 1984b , Martín 1996 , Martín and Calonge 2001 ); as well as new records, such as those of Mexico and Caribean countries (Hosford and Trappe 1980 ), Italy (Montecchi and Sarasini 2000 ), Japan (Hosford and Trappe 1988 ) and Spain (Martín and Calonge 2006 ), showing that the knowledge of the genus is not yet complete.…”

Section: Introductionmentioning

confidence: 99%

Molecular and morphological analyses confirm Rhizopogon verii as a widely distributed ectomycorrhizal false truffle in Europe, and its presence in South America

et al. 2016

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The genus Rhizopogon includes species with hypogeous or subepigeus habit, forming ectomycorrhizae with naturally occurring or planted pines (Pinaceae). Species of the genus Rhizopogon can be distinguished easily from the other hypogeous basidiomycetes by their lacunose gleba without columella and their smooth elliptical spores; however, the limit between species is not always easy to establish. Rhizopogon luteolus, the type species of the genus, has been considered one of the species that are more abundant in Europe, as well as it has been cited in pine plantation of North and South America, different parts of Africa, Australia, and New Zealand. However, in this study, based on molecular analyses of the ITS nuclear ribosomal DNA (nrDNA) sequences (19 new sequences; 37 sequences from GenBank/UNITE, including those from type specimens), we prove that many GenBank sequences under R. luteolus were misidentified and correspond to Rhizopogon verii, a species described from Tunisia. Also, we confirm that basidiomes and ectomycorrhizae recently collected in Germany under Pinus sylvestris, as well as specimens from South of Brazil under Pinus taeda belong to R. verii. Thanks to the numerous ectomycorrhizal tips collected in Germany, a complete description of R. verii/P. sylvestris ectomycorrhiza is provided. Moreover, since in this paper the presence of R. verii in South America is here reported for the first time, a short description of basidiomes collected in Brazil, compared with collections located in different European herbaria, is included.

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“…However, in practice, the entire network structure is not always available, e.g., for security reasons [9] . The distribution records of gateways [10,11] , which are another kind of propagation history, might be examined as a priority in making diagnoses.…”

Section: News?mentioning

confidence: 99%

Propagation history ranking in social networks: A causality-based approach

Wang¹,

Wang²,

Yao³

et al. 2020

Tinshhua Sci. Technol.

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Information diffusion is one of the most important issues in social network analysis. Unlike most existing works, which either rely on network topology or node profiles, this study focuses on the diffusion itself, i.e., the recorded propagation histories. These histories are the evidence of diffusion and can be used to explain to users what happened in their networks. However, these histories can quickly grow in size and complexity, limiting their capacity to be intuitively understood. To reduce this information overload, in this paper we present the problem of propagation history ranking. The goal is to rank participant edges/nodes by their contribution to the diffusion. We first discuss and adapt a causal measure, Difference of Causal Effects (DCE), as the ranking criterion. Then, to avoid the complex calculation of DCE, we propose two integrated ranking strategies by adopting two indicators. One is responsibility, which captures the necessity aspect of causal effects. We further give an approximate algorithm, which could guarantee a feasible solution, for this indicator. The other is capability, which captures the sufficiency aspect of causal effects. Finally, promising experimental results are presented to verify the feasibility of the proposed ranking strategies.

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Some new species and distribution records of Rhizopogon in North America

Cited by 13 publications

References 0 publications

Biology of the ectomycorrhizal genus, Rhizopogon

Biology of the ectomycorrhizal genus, Rhizopogon

Molecular and morphological analyses confirm Rhizopogon verii as a widely distributed ectomycorrhizal false truffle in Europe, and its presence in South America

Propagation history ranking in social networks: A causality-based approach

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