R. Knapp

ORCID: 0000-0002-0147-5687
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About
Contact & Profiles
Research Areas
  • Fern and Epiphyte Biology
  • Plant Diversity and Evolution
  • Botany and Plant Ecology Studies
  • Plant and animal studies
  • Plant and Fungal Species Descriptions
  • Ecology and Vegetation Dynamics Studies
  • Mediterranean and Iberian flora and fauna
  • Plant Parasitism and Resistance
  • Ecology and Conservation Studies
  • Plant Pathogens and Fungal Diseases
  • Mycorrhizal Fungi and Plant Interactions
  • Allelopathy and phytotoxic interactions
  • Plant Physiology and Cultivation Studies
  • Bryophyte Studies and Records
  • Botanical Research and Chemistry
  • Plant and fungal interactions
  • Lichen and fungal ecology
  • Plant Ecology and Taxonomy Studies
  • Horticultural and Viticultural Research
  • Agroforestry and silvopastoral systems
  • Polyamine Metabolism and Applications
  • Ruminant Nutrition and Digestive Physiology
  • Agriculture, Plant Science, Crop Management
  • melanin and skin pigmentation
  • Nematode management and characterization studies

Structure et Instabilité des Génomes
2019-2021

Dean McGee Eye Institute
2004-2005

University of Oklahoma Health Sciences Center
2005

Giessen School of Theology
1967-1979

Justus-Liebig-Universität Gießen
1962-1976

Schott (Germany)
1973

California Institute of Technology
1957

University of Cologne
1954-1955

Kliniken der Stadt Köln
1955

The lycophyte genus Selaginella alone constitutes the family Selaginellaceae, largest of families. is estimated to contain 700-800 species distributed on all continents except Antarctica, with highest diversity in tropical and subtropical regions. monophyly this broad sense has rarely been doubted, whereas its intrageneric classification notoriously contentious. Previous molecular studies were based very sparse sampling (up 62 species) often used DNA sequence data from one genome. In present...

10.1111/cla.12136 article EN Cladistics 2015-08-24

10.2307/2996550 article EN Bulletin of the Torrey Botanical Club 1985-07-01

Abstract The infrageneric relationships and taxonomy of the largest fern genus, Asplenium (Aspleniaceae), have remained poorly understood. Previous studies focused mainly on specific species complexes involving a few or dozens only, achieved large taxon sampling but only one plastid marker was used. In present study, DNA sequences from six markers ( atpB , rbcL rps4 ‐ trnS trnL trnL‐F ) 1030 accessions (616 them newly sequenced here) representing c . 420 (60% estimated diversity), 16...

10.1111/cla.12384 article EN Cladistics 2019-07-11

Abstract As an ancient lineage of ferns, Ophioglossaceae are evolutionarily among the most fascinating because they have highest chromosome count any known organism as well presence sporophores, subterranean gametophytes, eusporangiate sporangia without annuli, and endophytic fungi. Previous studies produced conflicting results, identifyingsome lineages with unresolved relationships, paid much attention to subfamily Botrychioideae. But other species‐rich subfamily, Ophioglossoideae, has...

10.1111/cla.12408 article EN Cladistics 2020-01-17

Abstract Lycopodiaceae are one of the oldest lineages any living vascular plants and contain about 400 species distributed on all continents except Antarctica, with its highest diversity in tropical regions. Previous studies morphology, anatomy, molecular systematics have made substantial progress understanding evolution family, but major issues remain. In particular, earlier had relatively sparse taxon sampling, some critical relationships among genera not been well resolved, monophyly...

10.1002/tax.12597 article EN Taxon 2021-11-06

Abstract Grammitidoideae are the largest subfamily in Polypodiaceae and contain about 911 species. Progress has been made understanding overall phylogeny generic boundaries light of recent molecular works. However, majority species, especially Asian some critical type species genera remain unsampled . In this study, a dataset six plastid markers 1003 (112 new) accessions representing ca. 412 including Ctenopterella , Grammitis Moranopteris Radiogrammitis Themelium was assembled to infer...

10.1002/tax.12992 article EN Taxon 2023-07-17

Nine new species of Hymenasplenium (Aspleniaceae) from Asia are here described based on both morphology and our recent molecular phylogenetics the genus. Of nine species, H. chingii, denticulatum, sinense, speluncicola, wangpeishanii southern China, whereas distans, ngheanense, phamhoanghoi, quangnamense Vietnam. These morphologically similar to but distinguishable those unilaterale s.l. group (H. apogamum, hondoense, murakami-hatanakae). All except one were included in a phylogenetic...

10.11646/phytotaxa.358.1.1 article EN Phytotaxa 2018-07-02

In the species groups related to Diphasiastrum multispicatum and D. veitchii, hybridization was investigated in samples from northern southern Vietnam island of Taiwan, including available herbarium specimens southeast Asia. The accessions were analyzed using flow cytometry (living material only), Sanger sequencing multiplexed inter-simple sequence repeat genotyping by sequencing. We detected two cases ancient involving different combinations parental species; both led via subsequent...

10.1016/j.ympev.2024.108067 article EN cc-by-nc Molecular Phylogenetics and Evolution 2024-03-30

Abstract The taxonomy of the cliff fern family Woodsiaceae has been controversial with 22–59 species in 1–7 genera recognized various classifications. This is mainly due to limited taxon sampling (up 33 accessions representing up 21 species) and poor resolution molecular studies so far. In present study, DNA sequences five plastid markers ( atpA , matK, rbcL, rps4 + rps4‐trnS, trnL trnL‐F ) 152 ca. 43 out 65 estimated (122 accessions), 30 non‐Woodsiaceae from most closely related four...

10.1002/tax.12180 article EN Taxon 2019-12-01

Following a recent phylogenetic study, we here review the circumscription of grammitid fern genus Oreogrammitis (Polypodiaceae: Grammitidoideae). We propose three new genera Calligrammitis, Devolia, and Glabrigrammitis, to accommodate clades resolved outside core Oreogrammitis. The taxonomic treatment is presented, morphology each shown with color plate.

10.11646/phytotaxa.597.1.4 article EN Phytotaxa 2023-05-10
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