identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
03C587D12D12FFE8FC2A3EEAFDBEF8CB.text	03C587D12D12FFE8FC2A3EEAFDBEF8CB.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Baccharis notosergila Griseb.	<div><p>Baccharis notosergila Griseb.</p><p>Abhandlungen der Königlichen Gesellschaft der Wissenschaften zu Göttingen 24: 183 (1879).</p><p>EXAMINED MATERIAL. — Argentina • Prov. Buenos Aires, Pdo, Magdalena, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-57.616665&amp;materialsCitation.latitude=-35.25" title="Search Plazi for locations around (long -57.616665/lat -35.25)">Vieytes</a>; 35°15’S, 57°37’W; 17.XII.2018; F. Fernández &amp; A. Carbone 1, 2, 3, 4; LPAG • same location; 11.XI.2020; F. Fernández &amp; A. Carbone 6, 7, 8; LPAG (in addition, specimens from Facultad de Ciencias Naturales y Museo Universidad Nacional de La Plata (LP) and Instituto de Botánica Darwinion (SI) were consulted) • Pdo, La Plata, Rufino de Elizalde; 22.III.1931; Cabrera, A.L. 1683, 1684; LP • same location; 05.IV.1932; Cabrera, A.L. 2127; LP • Pdo, Tigre, Las Conchas; 17.III.1927; Molfino &amp; Clos s/n; LP • Pdo de la Costa, Punta Médanos; 22.XII.1981; Troels Myndel Pedersen 13.194; LP • Pdo, Ramallo, Reserva Municipal de Ramallo; 22.II.2002; Torres Robles S. &amp; Trevisan V. 806; LP • Pdo, Berazategui, Hudson; 16.IV.1927; Burkart 1302; SI (image 15) .</p><p>DESCRIPTION</p><p>Veins and vascular bundles in the leaf petiole and blade cross sections</p><p>The petiole cross section shows three principal veins and twofour traces. Each vein of the petiole has one collateral vascular bundle with phloem and xylem and fiber caps on both sides surrounded by the parenchyma sheath. The primary and secondaries veins have one-three secretory structures situated next to and on the phloem side and enclosed by the parenchyma sheath (Fig. 1A, B). The leaf blade cross section of a young leaf (Fig. 1C), shows the primary vein formed by a collateral vascular bundle with fiber cap located only on the xylem side, and on the phloem side may be seen one to three secretory structures, all enclosed in the parenchyma sheath which has extensions to the adaxial and abaxial epidermis. In secondary veins the vascular bundle frequently shows scarce parenchyma sheath extensions to one epidermis and may has also one-three abaxial secretory structures, whereas in veins of 3 rd order, the vascular bundle does not have sheath extensions and on the phloem side there is only one duct. The 4th to 6th order veins do not present ducts (Fig. 1C).</p><p>Cavities and duct, characteristics in cross section</p><p>Cavities and ducts in cross sections are rounded in outline, and the space size of both structures is similar having a mean diameter value of 41.7 µm. They are lined by uniseriate epithelium formed by 4-6 (-8) cells (Fig. 2A, B). Some secretory structures are located on abaxial side and others on abaxial-lateral side (Fig. 2A). The last are cavities (Fig. 2C). Cavities also are found in the mesophyll (Fig. 2D). The epithelial cells frequently contain spheroid and red colored droplets of essential oils when treated with ORO, the space may be empty or filled with a resinous substance in which were identified resins, lipids and phenolic compounds (Fig. 2B; Fig. 5 C-E).</p><p>Cavities and duct locations</p><p>As was expressed above, the ducts are on abaxial (phloem) side of 1 st to 3 rd order veins. Cavities are isolated or in small clusters on lateral abaxial side of the 1 st to 5th order veins, at the end of 6th order veins (veinlets), and rarely in the mesophyll (Fig. 3 A, B).</p><p>False ducts, origin and characteristics in paradermal view</p><p>In paradermal view of B. notosergila leaf, we observed in the apical region of the leaf blade a row of initial cavities contacting one another (Fig. 4A). Then, we found a row of elongated cavities contacting their ends (Fig. 4B). These observations illustrate that with the leaf growth the cavities suffer elongation, and this row of several cavities keep the walls in contact each other forming a false duct. It is possible, later the walls in contact each other disappear and they merge forming a true duct. The false duct in paradermal view exhibit elongated and narrow epithelial cells (length from 152.9 to 644.7 µm) with slightly thick cellulosic walls.They would be a derived state after cavities elongation. The large epithelial cells come into contact with each other by touching their ends or overlapping. Inside were identified predominantly essential oils and resins (Fig.5A).</p><p>Cavities, origin and characteristics in paradermal view</p><p>Initial cavities may be in a row (Fig. 4A) or they may appear as an individual structure or forming small clusters of two-three cavities, whose shape is variable, oblong, oblong-elongated, oblong rounded, triangular or rounded. They have a length from 83.9 to 508.8 µm; their epithelial cells are short (length 21.7-97.9 µm) and with narrow walls (Fig. 5B). These cavities accumulate and reserve a resinous complex mixture. Lipids (essential oils), resins, phenolic compounds (tannins), and carbohydrates were identified (Fig. 5C-E).</p></div>	https://treatment.plazi.org/id/03C587D12D12FFE8FC2A3EEAFDBEF8CB	Public Domain	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.		Plazi	Arambarri, Ana M.;Hernández, Marcelo P.	Arambarri, Ana M., Hernández, Marcelo P. (2026): Internal secretory structures and histochemistry in leaves of Baccharis notosergila Griseb. (Asteraceae, Astereae). Adansonia (3) 48 (15): 159-170, DOI: 10.5252/adansonia2026v48a15
