World's Best Scientists 2026 revealed!

D-Index & Metrics

Plant Science and Agronomy

D-Index
78
Citations
20296
World Ranking
471
National Ranking
145

James M. Trappe publication distribution in Plant Science and Agronomy in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Plant Science and Agronomy in 2026. The highlighted bar marks where James M. Trappe sits on this spectrum.

36–40 publications: 2 scientists 41–45 publications: 7 scientists 46–50 publications: 40 scientists 51–55 publications: 58 scientists 56–60 publications: 60 scientists 61–65 publications: 107 scientists 66–70 publications: 130 scientists 71–75 publications: 153 scientists 76–80 publications: 191 scientists 81–85 publications: 199 scientists 86–90 publications: 206 scientists 91–95 publications: 218 scientists 96–100 publications: 226 scientists 101–105 publications: 227 scientists 106–110 publications: 247 scientists 111–115 publications: 255 scientists 116–120 publications: 253 scientists 121–125 publications: 233 scientists 126–130 publications: 219 scientists 131–135 publications: 201 scientists 136–140 publications: 194 scientists 141–145 publications: 176 scientists 146–150 publications: 157 scientists 151–155 publications: 147 scientists 156–160 publications: 151 scientists 161–165 publications: 159 scientists 166–170 publications: 137 scientists 171–175 publications: 128 scientists 176–180 publications: 126 scientists 181–185 publications: 98 scientists 186–190 publications: 114 scientists 191–195 publications: 100 scientists 196–200 publications: 90 scientists 201–205 publications: 71 scientists 206–210 publications: 98 scientists 211–215 publications: 70 scientists 216–220 publications: 86 scientists 221–225 publications: 61 scientists 226–230 publications: 58 scientists 231–235 publications: 53 scientists 236–240 publications: 64 scientists 241–245 publications: 39 scientists 246–250 publications: 46 scientists 251–255 publications: 51 scientists 256–260 publications: 36 scientists 261–265 publications: 44 scientists 266–270 publications: 35 scientists 271–275 publications: 30 scientists 276–280 publications: 33 scientists 281–285 publications: 35 scientists 286–290 publications: 36 scientists 291–295 publications: 26 scientists 296–300 publications: 26 scientists 301–305 publications: 31 scientists 306–310 publications: 30 scientists 311–315 publications: 21 scientists 316–320 publications: 29 scientists 321–325 publications: 14 scientists 326–330 publications: 15 scientists 331–335 publications: 15 scientists 336–340 publications: 17 scientists 341–345 publications: 15 scientists 346–350 publications: 12 scientists 351–355 publications: 17 scientists 356–360 publications: 18 scientists 361–365 publications: 12 scientists 366–370 publications: 11 scientists 371–375 publications: 6 scientists 376–380 publications: 6 scientists 381–385 publications: 11 scientists 386–390 publications: 9 scientists 391–395 publications: 10 scientists 396–400 publications: 8 scientists 401–405 publications: 4 scientists 406–410 publications: 9 scientists 411–415 publications: 11 scientists 416–420 publications: 4 scientists 421–425 publications: 7 scientists 426–430 publications: 4 scientists 431–435 publications: 3 scientists 436–440 publications: 5 scientists 441–445 publications: 8 scientists 446–450 publications: 6 scientists 451–455 publications: 7 scientists 456–460 publications: 5 scientists 461–465 publications: 6 scientists 466 publications: 2 scientists 467+ publications: 99 scientists
36 publications 467+

This scientist: 304 publications — 93rd percentile

93% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 467 publications or more.

James M. Trappe D-index placement in Plant Science and Agronomy in 2026

The chart shows the D-index (discipline H-index) distribution of Plant Science and Agronomy scientists ranked by Research.com in 2026. The highlighted bar marks where James M. Trappe sits on this spectrum.

30 D-Index: 200 scientists 31 D-Index: 236 scientists 32 D-Index: 253 scientists 33 D-Index: 283 scientists 34 D-Index: 288 scientists 35 D-Index: 240 scientists 36 D-Index: 246 scientists 37 D-Index: 243 scientists 38 D-Index: 247 scientists 39 D-Index: 229 scientists 40 D-Index: 232 scientists 41 D-Index: 230 scientists 42 D-Index: 228 scientists 43 D-Index: 219 scientists 44 D-Index: 193 scientists 45 D-Index: 164 scientists 46 D-Index: 158 scientists 47 D-Index: 143 scientists 48 D-Index: 131 scientists 49 D-Index: 127 scientists 50 D-Index: 122 scientists 51 D-Index: 122 scientists 52 D-Index: 110 scientists 53 D-Index: 102 scientists 54 D-Index: 98 scientists 55 D-Index: 79 scientists 56 D-Index: 85 scientists 57 D-Index: 88 scientists 58 D-Index: 91 scientists 59 D-Index: 62 scientists 60 D-Index: 61 scientists 61 D-Index: 59 scientists 62 D-Index: 54 scientists 63 D-Index: 61 scientists 64 D-Index: 59 scientists 65 D-Index: 58 scientists 66 D-Index: 41 scientists 67 D-Index: 49 scientists 68 D-Index: 39 scientists 69 D-Index: 32 scientists 70 D-Index: 40 scientists 71 D-Index: 47 scientists 72 D-Index: 38 scientists 73 D-Index: 28 scientists 74 D-Index: 29 scientists 75 D-Index: 28 scientists 76 D-Index: 22 scientists 77 D-Index: 21 scientists 78 D-Index: 25 scientists 79 D-Index: 26 scientists 80 D-Index: 19 scientists 81 D-Index: 16 scientists 82 D-Index: 12 scientists 83 D-Index: 16 scientists 84 D-Index: 14 scientists 85 D-Index: 11 scientists 86 D-Index: 17 scientists 87 D-Index: 13 scientists 88 D-Index: 10 scientists 89 D-Index: 12 scientists 90 D-Index: 18 scientists 91 D-Index: 16 scientists 92 D-Index: 16 scientists 93 D-Index: 17 scientists 94 D-Index: 12 scientists 95 D-Index: 8 scientists 96 D-Index: 9 scientists 97 D-Index: 9 scientists 98 D-Index: 11 scientists 99 D-Index: 12 scientists 100 D-Index: 5 scientists 101 D-Index: 8 scientists 102 D-Index: 4 scientists 103 D-Index: 11 scientists 104 D-Index: 5 scientists 105 D-Index: 9 scientists 106 D-Index: 7 scientists 107 D-Index: 4 scientists 108 D-Index: 8 scientists 109+ D-Index: 99 scientists
30 D-Index 109+

This scientist: 78 D-Index — 93rd percentile

93% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 109 D-Index or more.

Research.com Recognitions

  • 1970 - Fellow of the American Association for the Advancement of Science (AAAS)

Overview

What is he best known for?

The fields of study he is best known for:

  • Ecology
  • Botany
  • Genus

James M. Trappe focuses on Botany, Ecology, Mycorrhiza, Colonization and Fungus. His Botany research includes elements of Dark septate endophyte and Rhizopogon. His Mycorrhiza research includes themes of Coarse woody debris, Ramaria, Clavulina, Phycomycetes and Balsamia.

His Colonization study combines topics in areas such as Mutualism, Endogonales, Vascular plant, Mucoromycotina and Glomeromycota. The study incorporates disciplines such as Biomass, Inoculation and Hartig net in addition to Fungus. His work carried out in the field of Biogeography brings together such families of science as Inocybe, Sister group, Truffle, Taxon and Endemism.

His most cited work include:

  • The dawn of symbiosis between plants and fungi (173 citations)
  • The dawn of symbiosis between plants and fungi (173 citations)
  • Biology of the ectomycorrhizal genus, Rhizopogon (171 citations)

What are the main themes of his work throughout his whole career to date?

James M. Trappe mainly investigates Botany, Ecology, Truffle, Genus and Taxonomy. His Botany study integrates concerns from other disciplines, such as Zoology and Mycorrhiza, Rhizopogon. His research integrates issues of Horticulture and Seedling in his study of Mycorrhiza.

The study incorporates disciplines such as Boletales and Suillus in addition to Rhizopogon. His Truffle research is multidisciplinary, incorporating elements of Pezizaceae and Pezizales. His work carried out in the field of Genus brings together such families of science as Evolutionary biology and Russula.

He most often published in these fields:

  • Botany (62.38%)
  • Ecology (40.59%)
  • Truffle (20.79%)

What were the highlights of his more recent work (between 2009-2020)?

  • Botany (62.38%)
  • Ecology (40.59%)
  • Truffle (20.79%)

In recent papers he was focusing on the following fields of study:

His primary scientific interests are in Botany, Ecology, Truffle, Genus and Pezizales. His work in Botany is not limited to one particular discipline; it also encompasses Nutrient. His study in Ecology is interdisciplinary in nature, drawing from both Desert and Ectomycorrhizae.

His research in Truffle intersects with topics in Taxonomy, Pezizaceae, Endemism and Spore. His Genus research integrates issues from Evolutionary biology, Russula, Eucalyptus and Russulaceae. His Pezizales research focuses on Clade and how it relates to Agaricaceae, Adaptive radiation, Lepiota and Cortinariaceae.

Between 2009 and 2020, his most popular works were:

  • The dawn of symbiosis between plants and fungi (173 citations)
  • The dawn of symbiosis between plants and fungi (173 citations)
  • Historical biogeography and diversification of Truffles in the Tuberaceae and their newly identified southern hemisphere sister lineage (153 citations)

In his most recent research, the most cited papers focused on:

  • Ecology
  • Botany
  • Genus

Botany, Truffle, Ecology, Tuberaceae and Pezizales are his primary areas of study. James M. Trappe studies Cortinarius which is a part of Botany. He interconnects Endemism, Pezizaceae, Biogeography and Spore in the investigation of issues within Truffle.

James M. Trappe has researched Spore in several fields, including Phylogenetic diversity, Ecological significance, Fungus and Morphology. His Ecology study combines topics in areas such as Glomeromycota and Mucoromycotina. His Pezizales research is multidisciplinary, incorporating perspectives in Mating and Internal transcribed spacer.

Best Publications

  • Dark septate endophytes: a review of facultative biotrophic root-colonizing fungi

    Ari Jumpponen;Ari Jumpponen;James M. Trappe

  • The Ascomycota Tree of Life: A Phylum-wide Phylogeny Clarifies the Origin and Evolution of Fundamental Reproductive and Ecological Traits

    Conrad L. Schoch;Gi Ho Sung;Francesc López-Giráldez;Jeffrey P. Townsend

  • Patterns and regulation of mycorrhizal plant and fungal diversity

    Edith B. Allen;Michael F. Allen;Dot J. Helm;James M. Trappe

  • The Endogonaceae in the Pacific Northwest

    Unknown

  • Selection of Fungi for Ectomycorrhizal Inoculation in Nurseries

    Unknown

  • Global diversity and distribution of macrofungi

    Gregory M. Mueller;John P. Schmit;Patrick R. Leacock;Bart Buyck

  • Patterns of Ectomycorrhizal Host Specificity and Potential among Pacific Northwest Conifers and Fungi

    Randy Molina;James M. Trappe

  • Phylogenetic relationships among ascomycetous truffles and the true and false morels inferred from 18S and 28S ribosomal DNA sequence analysis

    Kerry O'Donnell;Elizabeth Cigelnik;Nancy S. Weber;James M. Trappe

  • REACTIONS OF MYCORRHIZAL FUNGI AND MYCORRHIZA FORMATION TO PESTICIDES

    James M. Trappe;Randy Molina;Michael Castellano

  • The Seen and Unseen World of the Fallen Tree

    Unknown

  • The dawn of symbiosis between plants and fungi

    Martin I. Bidartondo;Martin I. Bidartondo;David J. Read;James M. Trappe;James M. Trappe;Vincent Merckx

  • Biology of the ectomycorrhizal genus, Rhizopogon

    Randy Molina;James M. Trappe

  • A global meta-analysis of Tuber ITS rDNA sequences: species diversity, host associations and long-distance dispersal.

    Gregory M. Bonito;Andrii P. Gryganskyi;James M. Trappe;Rytas Vilgalys

  • Molecular phylogenetics of the gomphoid-phalloid fungi with an establishment of the new subclass Phallomycetidae and two new orders.

    Kentaro Hosaka;Scott T. Bates;Ross E. Beever;Michael A. Castellano

  • Historical biogeography and diversification of Truffles in the Tuberaceae and their newly identified southern hemisphere sister lineage

    Gregory Bonito;Matthew E. Smith;Michael Nowak;Rosanne A. Healy

  • Multiple origins of sequestrate fungi related to Cortinarius (Cortinariaceae).

    Ursula Peintner;Neale L. Bougher;Michael A. Castellano;Jean-Marc Moncalvo

  • Mycorrhizal vs saprotrophic status of fungi: the isotopic evidence

    Erik A. Hobbie;Erik A. Hobbie;Nancy S. Weber;James M. Trappe

  • Ectomycorrhizal formation in Eucalyptus. I. Pure culture synthesis, host specificity and mycorrhizal compatibility with Pinus radiata

    Nicholas Malajczuk;Randy Molina;James M. Trappe

  • Mycorrhizal functioning of Phialocephala fortinii with Pinus contorta on glacier forefront soil: interactions with soil nitrogen and organic matter.

    A. Jumpponen;Kim G. Mattson;James M. Trappe

  • Characterization of ‘safe sites’ for pioneers in primary succession on recently deglaciated terrain

    Ari Jumpponen;Henry Väre;Kim G. Mattson;Rauni Ohtonen

  • Hypogeous fungal production in mature Douglas-fir forest fragments and surrounding plantations and its relation to coarse woody debris and animal mycophagy

    Michael Amaranthus;James M. Trappe;Larry Bednar;David Arthur

  • Foliar and fungal 15 N: 14 N ratios reflect development of mycorrhizae and nitrogen supply during primary succession: testing analytical models

    Erik A. Hobbie;Ari Jumpponen;Jim Trappe

  • LACK OF MYCORRHIZAL SPECIFICITY BY THE ERICACEOUS HOSTS ARBUTUS MENZIESII AND ARCTOSTAPHYLOS UV A‐URSI

    Randy Molina;James M. Trappe

  • Utilization of major detrital substrates by dark-septate, root endophytes'

    Bruce A. Caldwell;Ari Jumpponen;James M. Trappe

  • Fungus associates of ectotrophic mycorrhizae

    Unknown

  • STANDING CROP AND ANIMAL CONSUMPTION OF FUNGAL SPOROCARPS IN PACIFIC NORTHWEST FORESTS

    Malcolm North;James Trappe;Jerry Franklin

  • Mycorrhiza-plant colonization patterns on a subalpine glacier forefront as a model system of primary succession.

    Efrén Cázares;James M. Trappe;Ari Jumpponen

  • Ectomycorrhizal fungi in Eucalyptus and Pinus plantations in southern Brazil

    Admir J. Giachini;Veturia L. Oliveira;Michael A. Castellano;James M. Trappe

  • MYCORRHIZAE AND PRODUCTIVITY OF ARID AND SEMIARID RANGELANDS

    James M. Trappe

  • Root colonization of Lupinus latifolius Agardh. and Pinus contorta Dougl. by Phialocephala fortinii Wang & Wilcox

    T. E. O'dell;H. B. Massicotte;J. M. Trappe

  • Mycorrhizal chronosequence near Exit Glacier, Alaska

    D.J. Helm;E.B. Allen;J.M. Trappe

  • Food Reserves and Seasonal Growth of Douglas-Fir Seedlings

    Kenneth W. Krueger;James M. Trappe

  • Occurrence of ectomycorrhizal fungi on the forefront of retreating Lyman Glacier (Washington, USA) in relation to time since deglaciation

    Ari Jumpponen;James M. Trappe;Efren Cázares

Frequent Co-Authors

Andrew W. Claridge
Andrew W. Claridge University of New South Wales
Ari Jumpponen
Ari Jumpponen Kansas State University
Randy Molina
Randy Molina Oregon State University
Gregory Bonito
Gregory Bonito Michigan State University
Matthew E. Smith
Matthew E. Smith University of Florida
Rytas Vilgalys
Rytas Vilgalys Duke University
Gábor M. Kovács
Gábor M. Kovács Eötvös Loránd University
Erik A. Hobbie
Erik A. Hobbie University of New Hampshire
Joseph W. Spatafora
Joseph W. Spatafora Oregon State University
Nicholas Malajczuk
Nicholas Malajczuk Murdoch University

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