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46 results for “Viscaceae”
Phoradendron leucarpum (Viscaceae) - bark - of a small tree or small branch
Image of Phoradendron leucarpum (Viscaceae) - bark - of a small tree or small branch
Phoradendron leucarpum (Viscaceae) - bark - of a small tree or small branch
Image of Phoradendron leucarpum (Viscaceae) - bark - of a small tree or small branch
Phoradendron leucarpum (Viscaceae) - inflorescence - whole - unspecified
Image of Phoradendron leucarpum (Viscaceae) - inflorescence - whole - unspecified
Phoradendron leucarpum (Viscaceae) - whole tree (or vine) - general
Image of Phoradendron leucarpum (Viscaceae) - whole tree (or vine) - general
Data from: Host cues mediate growth and establishment of oak mistletoe (Phoradendron leucarpum, Viscaceae), an aerial parasitic plant.
The oak mistletoe (Phoradendron leucarpum, Viscaceae) is well-documented to exhibit preference for a few potential host species in a given locality, even when many potential host species are present. In trying to explain this distribution, we examined the mechanisms by which mistletoe seedlings recognize potentially suitable hosts in the Piney Woods ecoregion of east Texas. An initial survey of patterns of infection on the campus of Sam Houston State University revealed that water oak (Quercus nigra) was host to nearly half of the mistletoes observed, despite comprising less than 15% of trees surveyed. Field experiments demonstrated that light, host physiochemistry, and volatiles released from potential host trees serve as cues affecting the viability and establishment of mistletoe seedlings. These results provoked further study in controlled laboratory settings, in which it was demonstrated that chemical compounds in the bark of local host trees (compared to trees that serve as hosts elsewhere, but not in our survey) induce significantly although slightly greater seedling viability. Establishment of haustoria depended only on the presence of these chemicals, regardless of host species. Importantly, we demonstrated that three common monoterpenes, limonene, β-myrcene, and β-phellandrene induce a positive growth response of mistletoe radicles. These results taken together suggest a model to explain local host preference in P. leucarpum, in which covariation between mistletoe fruit maturity and monoterpene production by hosts determines the distribution of successful haustorial establishment.
FIGURE 5 in Scale insect fauna (Hemiptera: Sternorrhyncha: Coccoidea) of New Zealand's pygmy mistletoes (Korthalsella: Viscaceae) with description of three new species: Leucaspis albotecta, L. trilobata (Diaspididae) and Eriococcus korthalsellae (Eriococcidae)
FIGURE 5. Leucaspis trilobata Henderson sp. nov., adult female. Pupillarium with vignette of dorsal sclerotisation pattern.
FIGURE 2 in Scale insect fauna (Hemiptera: Sternorrhyncha: Coccoidea) of New Zealand's pygmy mistletoes (Korthalsella: Viscaceae) with description of three new species: Leucaspis albotecta, L. trilobata (Diaspididae) and Eriococcus korthalsellae (Eriococcidae)
FIGURE 2. Leucaspis albotecta Henderson sp. nov., adult female. Pupillarium with vignette of dorsal sclerotisation pattern.
FIGURE 1 in Scale insect fauna (Hemiptera: Sternorrhyncha: Coccoidea) of New Zealand's pygmy mistletoes (Korthalsella: Viscaceae) with description of three new species: Leucaspis albotecta, L. trilobata (Diaspididae) and Eriococcus korthalsellae (Eriococcidae)
FIGURE 1. New Zealand Korthalsella species in life. A, young fruiting K. clavata parasitic on Coprosma propinqua; B, flowering K. salicornioides parasitic on Leptospermum scoparium; C. fruiting K. lindsayi parasitic on Melicope simplex; D, Leucaspis trilobata sp. nov. on K. lindsayi.
FIGURE 12. Distribution map for Leucaspis albotecta, L in Scale insect fauna (Hemiptera: Sternorrhyncha: Coccoidea) of New Zealand's pygmy mistletoes (Korthalsella: Viscaceae) with description of three new species: Leucaspis albotecta, L. trilobata (Diaspididae) and Eriococcus korthalsellae (Eriococcidae)
FIGURE 12. Distribution map for Leucaspis albotecta, L. trilobata and Eriococcus korthalsellae in New Zealand.
FIGURE 1 in Viscum meyeri (Viscaceae)-a new name for Viscum anceps, an old-established mistletoe species endemic to southern Africa
FIGURE 1. Lectotype of Viscum meyeri and its replaced synonym Viscum anceps E.Mey. ex Sprague (K [barcode K000431432]; image credit: Royal Botanic Gardens, Kew).
FIGURE 2. Phoradendron longicaule Kuijt & V.W. Steinm. A in Phoradendron longicaule (Viscaceae): a new species from Michoacán, Mexico
FIGURE 2. Phoradendron longicaule Kuijt & V.W. Steinm. A. Habit; B. Close-up of shoot system; C. Staminate inflorescences; D. Young fruits on pistillate infructescences. A, C Steinmann 6584; B, D Steinmann & Ramírez-Amezcua 7843. Photos by Victor W. Steinmann and Yocupitzia Ramírez-Amezcua.
FIGURE 1. Phoradendron longicaule Kuijt & V.W. Steinm. A in Phoradendron longicaule (Viscaceae): a new species from Michoacán, Mexico
FIGURE 1. Phoradendron longicaule Kuijt & V.W. Steinm. A. Habit; B. Young, pendulous shoot; C. Node with young and mature staminate inflorescence; D. Infructescence. A–C based on Steinmann 4264; D based on Steinmann & Ramírez-Amezcua 7843. Drawn by Job Kuijt.
Data from: Plastome and nuclear phylogenies of dwarf mistletoes (Arceuthobium: Viscaceae)
<p>Dwarf mistletoes are a group of morphologically-reduced aerial shoot parasites of Pinaceae and Cupressaceae found in the northern hemisphere and equatorial east Africa. Though diagnosable by a suite of morphological traits, phylogenetic knowledge of species relationships has been limited to studies employing either comprehensive sampling of one or two genes, or more sequence data but limited taxonomic sampling. We used genome skimming data to assemble 3kb of the nuclear ribosomal cistron and up to 45kb of the plastome to clarify the phylogenetic root of the genus, species monophyly, and relationships among infraspecific taxa. Genomic differentiation among taxa was variable; however, we found strong support for reciprocally monophyletic New World and Old World lineages and congruent nrDNA and plastome topologies at the species level and below, and most taxonomic sections and at the species level and below. Plastome gene content was stable across the genus with minimal pseudogenization or loss, with the notable exception of <i>cemA</i>. These findings form the basis of our re-evaluation of historical biogeographical hypotheses, species and subspecies-level taxonomy, and plastome evolution in <i>Arceuthobium. </i>More broadly, this work provides a foundation for future clade-focused comparative and biosystematics studies of <i>Arceuthobium.</i></p>
Data from: Host cues mediate growth and establishment of oak mistletoe (Phoradendron leucarpum, Viscaceae), an aerial parasitic plant.
Open the record for dataset details and reuse information.
Data from: Plastome and nuclear phylogenies of dwarf mistletoes (Arceuthobium: Viscaceae)
Open the record for dataset details and reuse information.
Figure 2 from: Canelón DS, Niño SM, Dorr LJ, Caraballo-Ortiz MA (2020) Two new species of Dendrophthora (Viscaceae) from the Venezuelan Andes. PhytoKeys 140: 1-10. https://doi.org/10.3897/phytokeys.140.48865
Figure 2 Dendrophthora apiculata. A Habit B fruit C basal flowers (staminate) (Photograph: D. Canelón).
Figure 1 from: Canelón DS, Niño SM, Dorr LJ, Caraballo-Ortiz MA (2020) Two new species of Dendrophthora (Viscaceae) from the Venezuelan Andes. PhytoKeys 140: 1-10. https://doi.org/10.3897/phytokeys.140.48865
Figure 1 Distribution of Dendrophthora apiculata and D. coronata in the Andes of Venezuela. (Source: Centro Cartográfico, UNELLEZ-VPA, 2019).
Figure 3 from: Canelón DS, Niño SM, Dorr LJ, Caraballo-Ortiz MA (2020) Two new species of Dendrophthora (Viscaceae) from the Venezuelan Andes. PhytoKeys 140: 1-10. https://doi.org/10.3897/phytokeys.140.48865
Figure 3 Dendrophthora apiculata. A Terminal branches showing inflorescences and leaves, including an enlargement of a leaf apex showing the apiculum (striations are not visible in these terminal branches) B Cataphylls at the base of a node C Papillose indumentum D–F Segments of pistillate inflorescences G–I Pistillate flowers J, K Mature fruits. (Source: Stergios et al. 20126, US).
Figure 4 from: Canelón DS, Niño SM, Dorr LJ, Caraballo-Ortiz MA (2020) Two new species of Dendrophthora (Viscaceae) from the Venezuelan Andes. PhytoKeys 140: 1-10. https://doi.org/10.3897/phytokeys.140.48865
Figure 4 Dendrophthora coronata. A Leaf and terminal inflorescences B Cataphylls at the base of a node C Coroniform trichomes D Complete pistillate inflorescence E–G Segments of a pistillate inflorescence H, I Flowers with vestigial anthers J–L Mature fruits. (Source: Dorr et al. 8988, US).
FIGURE 10 in Scale insect fauna (Hemiptera: Sternorrhyncha: Coccoidea) of New Zealand's pygmy mistletoes (Korthalsella: Viscaceae) with description of three new species: Leucaspis albotecta, L. trilobata (Diaspididae) and Eriococcus korthalsellae (Eriococcidae)
FIGURE 10. Eriococcus korthalsellae Henderson sp. nov., 2nd-instar male nymph.
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