Stizophyllum
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publication ID |
https://doi.org/ 10.5252/adansonia2023v45a12 |
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DOI |
https://doi.org/10.5281/zenodo.8015257 |
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persistent identifier |
https://treatment.plazi.org/id/039687DC-FFC9-9132-8DEB-C097FB94AEA2 |
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treatment provided by |
Felipe |
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scientific name |
Stizophyllum |
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II. Stizophyllum View in CoL View at ENA clade
TAXONOMIC INFORMATION. — This clade contains a single genus, Stizophyllum , with four phloem wedges in transversal section ( Fig. 4A View FIG ).
TOTAL NUMBER OF SPECIES IN THIS CLADE. — Three species ( Lohmann & Taylor 2014).
STUDIED SPECIES. — Three species, Stizophyllum inaequilaterum Bureau & K.Schum. , S. perforatum (Cham.) Miers , and S. riparium (Kunth) Sandwith.
Regular phloem
Thick fiber bands ( Fig. 8B View FIG ), assemblages present ( Fig. 8C View FIG ).
Variant phloem
General configuration. Fibrous phloem ( Fig. 8A, D View FIG ), with some non-fibrous, parenchyma bands in alternation ( Fig. 8A, D View FIG ). Axial elements with either a tangential ( Fig. 8A View FIG ) or a radial arrangement ( Fig. 8D View FIG ).
Sieve tube elements. As seen in transverse section, each sieve element is associated with 1-3 companion cells ( Fig. 8E View FIG ), lying on the same corner of the sieve tube ( Fig. 8E View FIG ). The sieve elements are generally arranged in multiples of 2-3 in a radial or tangential disposition, sometimes in clusters ( Fig. 8E View FIG ). Sieve tubes of narrower radial diameter can be found associated with a parenchyma band ( Fig. 8D View FIG ). Such sieve tubes are found in radial multiples of 2-4 cells. As seen in longitudinal section, the sieve elements are thinner than 1 mm, with end walls inclined, bearing sieve plates with 6-10 sieve areas ( Fig. 8F View FIG ). Ray sieve-tube elements are common ( Fig. 8F View FIG ).
Axial parenchyma. The phloem parenchyma is sieve-tube-centric incomplete ( Fig. 8D, E View FIG ), not surrounding the entire sieve tube or sieve tube group, and commonly lignified ( Fig. 8E View FIG ). A parenchyma band of 3-4 rows of cells is present ( Fig. 8A, D View FIG ) associated with narrower sieve elements. In addition, radial rows of axial parenchyma cells are present in some places, sometimes entirely lignified
Fibers. Fibers form a matrix where all other cells can be found ( Fig. 8A, D, E View FIG ).
Rays. The limiting rays are lignified to both xylem and phloem sides, with a radial row of non-lignified cells between them ( Fig. 8A View FIG ). The wedge rays have randomly alternating portions that can be lignified or non-lignified ( Fig. 8D, E View FIG ).
Crystals. Acicular crystals are present in most of the phloem and ray parenchyma cells.
Periderm
Only one periderm is present. The phellem is stratified, composed of thin and thick-walled cells disposed in alternation. The phelloderm is thick, with more than three layers of cells, non-stratified ( Table 2 View TABLE ).
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.