Comprehensive Description
(
Inglês
)
fornecido por Smithsonian Contributions to Botany
Vellozia exilis Goethart & Henrard
SPECIMENS EXAMINED.—Goethart and Henrard 12696; Irwin 12692; Irwin et al. 9507.
SURFACE VIEW.—Hairs: few and in tufts. Epidermis: cells rectangular on abaxial and adaxial surfaces; walls thin on both surfaces. Stomata: paracytic, 18 × 3 μm; present on abaxial surface.
TRANSVERSE SECTION OF LAMINA.—Dorsiventral; V-shaped with flanges inversely inrolled; abaxial median section laterally extended on both sides. Adaxial surface slightly undulating, occasionally ridged toward median of lamina; abaxial surface furrowed about one-fourth thickness of blade. Epidermis: adaxial cells more or less dome shaped; abaxial cells dome shaped to conical; cells thin walled. Subjacent to adaxial epidermis occur three to six layers of sclerenchyma cells interspersed with radial rows of two to four parenchyma cells; subjacent to sclerenchyma and radial rows of parenchyma cells is one layer of distinct parenchyma cells. Cuticle: thick on adaxial surface; thin on abaxial surface; slightly ridged. Stomata: present in abaxial furrows; small substomatal chamber present; associated with short epidermal projections in furrows. Mesophyll: two to three distinct layers of palisade tissue abruptly changing into compactly arranged spongy tissue. One to two layers of large translucent cells arranged radially above vascular bundles. Vascular bundles: 9; no commissural bundles observed. One to two large vessels present, mostly one. Two phloem units lying laterally in flanges of Y-shaped abaxial girder. Adaxial cap more or less inverted V shaped. Lateral extensions formed on either side of median abaxial vein have compactly arranged spongy mesophyll and a broad band of sclerenchyma cells. Bundle sheath completely surrounding vascular bundles. Abaxial strands present. Crystals and tannins: not observed.
NOTE: The leaf shape of this species is very distinctive in the Velloziaceae, thus rendering its identification simple.
- citação bibliográfica
- Ayensu, Edward S. 1974. "Leaf Anatomy and Systematics of New World Velloziaceae." Smithsonian Contributions to Botany. 1-125. https://doi.org/10.5479/si.0081024X.15
Comprehensive Description
(
Inglês
)
fornecido por Smithsonian Contributions to Botany
Vellozia exilis Goethart & Henrard
Vellozia exilis Goethart & Henrard, Blumea, 2:370, 1937.—L. B. Smith, Contr. U.S. Nat. Herb., 35:267, 1962.—Ayensu, Smithsonian Contr. Bot., 15:23, fig. 14d–e, pl. 34e–f, 1974.
TYPE.—Between rocks, Chapadão dos Veadeiros, Goiás, Brazil, 9 January 1895, Glaziou 22220 (L, holotype; B, photo).
DISTRIBUTION.—Known only from the type-locality, ca. 14°S, 47°W.
- citação bibliográfica
- Smith, Lyman B. and Ayensu, Edward S. 1976. "A Revision of American Velloziaceae." Smithsonian Contributions to Botany. 1-172. https://doi.org/10.5479/si.0081024X.30
Vellozia exilis
(
Vietnamita
)
fornecido por wikipedia VI
Vellozia exilis là một loài thực vật có hoa trong họ Velloziaceae. Loài này được Goethart & Henrard miêu tả khoa học đầu tiên năm 1937.[1]
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Vellozia exilis: Brief Summary
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Vietnamita
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fornecido por wikipedia VI
Vellozia exilis là một loài thực vật có hoa trong họ Velloziaceae. Loài này được Goethart & Henrard miêu tả khoa học đầu tiên năm 1937.
- licença
- cc-by-sa-3.0
- direitos autorais
- Wikipedia tác giả và biên tập viên
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