Manaosella
publication ID |
https://doi.org/ 10.5252/adansonia2023v45a12 |
DOI |
https://doi.org/10.5281/zenodo.8015263 |
persistent identifier |
https://treatment.plazi.org/id/039687DC-FFD6-9129-8A19-C795FDC3AB1E |
treatment provided by |
Felipe |
scientific name |
Manaosella |
status |
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V. Manaosella View in CoL View at ENA clade
TAXONOMIC INFORMATION. — This clade contains a single genus, Manaosella , with four phloem wedges in transversal section.
TOTAL NUMBER OF SPECIES IN THIS CLADE. — One species.
STUDIED SPECIES. — One species, Manaosella cordifolia (DC.) A.H. Gentry.
Regular phloem
Thin to thick fiber bands, fibers tangentially elongated in some portions, assemblages absent.
Variant phloem
General configuration. Non-fibrous ( Fig. 10A View FIG ), with approximately 14-16 rows of sieve tubes and phloem parenchyma cells between fiber bands. The axial elements present a diffuse arrangement, sometimes with a radial tendency ( Fig. 10 View FIG A-C).
Sieve-tube elements. As seen in transverse section, each sieve element is associated with one companion cell ( Fig. 10C View FIG ). Sieve tubes of two distinct diameters occur adjacent to one another and are predominantly solitary ( Fig. 10B, C View FIG ), occasionally radially disposed and arranged in multiples of 2-3. As seen in longitudinal section, the sieve elements are thinner than 1 mm and their end walls are inclined, bearing sieve plates with 7-15 sieve areas.
Axial parenchyma. The phloem parenchyma forms a matrix in which sieve elements and fiber bands are embedded ( Fig. 10 View FIG AC). Sometimes radial rows of phloem parenchyma can be also detected between or next to sieve elements ( Fig. 10B, C View FIG ).
Fibers. The fiber bands in Manaosella bear cells that are conspicuously radially elongated ( Fig. 10B View FIG ), a feature not found in any other Bignonieae genus. The fiber bands are composed of 2-3 rows of cells, with the cells located in the center or upper portions of the band radially elongated.
Rays. The limiting rays are lignified only to the xylem face ( Fig. 10A, B View FIG ). The wedge rays are non-lignified, except when crossing the fiber bands ( Fig. 10B, C View FIG ).
Crystals. Acicular crystals are very abundant and are found in most cells of the phloem and ray parenchyma ( Fig. 10C View FIG ).
Periderm
A single periderm formed. The phellem is stratified, composed of thin and thick-walled cells in alternation. The phelloderm is thin, with less than three layers of cells, non-stratified ( Table 2 View TABLE ). Lenticels non-stratified, unlignified.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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