Comparative midrib anatomy of Monodora Dunal. and Isolona Engl. (Annonaceae) from West-central Africa

This article assessed midrib anatomical description of Isolona Dunal. And Monodora Engl. (Annonaceae) from West-Central Africa. Twelve species of tribe Monodoreae were investigated on the basis of micromorphology of midrib characters with the aid of light microscopy. The study provided important taxonomic characters which aid delineation of inter and infrageneric species within the duo genera. The generic features include centrally positioned, open collateral vascular bundle and furrow shaped midribs which are diagnostic to the genera.U shaped vascular bundles are present in most of the species with inviginating or expanded endings while marginal traces vary from 2 to 4. The presence of keel protrusion at abaxial surface established a closer affinity among M. angolensis, M. crispata, and M undulata with additional features species were delimited. Other variable useful features of midrib encountered are trichomes, parenchyma, collenchyma and sclerenchyma, and adaxial and abaxial shape. The midrib characters have been used to prepare an indented dichotomous key to delimit the species in the genera studied. Bangladesh J. Plant Taxon. 27(2): 283-291, 2020 (December)

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Taxonomic significance of some leaf anatomical features of the species of Annona L. (annonaceae) from Nigeria

Ife Journal of Science ◽

10.4314/ijs.v22i1.11 ◽

2020 ◽

Vol 22 (1) ◽

pp. 101-112

Author(s):

S.A. Adeniran ◽

A.B. Kadiri ◽

J.D. Olowokudejo

Keyword(s):

Vascular Bundles ◽

Taxonomic Significance ◽

Anticlinal Wall ◽

Abaxial Surface ◽

Anatomical Features ◽

Qualitative And Quantitative ◽

Dichotomous Key ◽

The Mean ◽

Generic Constant ◽

Existing Data

A comparative study of the some leaf anatomical features of four species of Annona occurring in Nigerian was undertaken with the aid of light microscope. The four foliar structures (epidermis, petiole, midrib and lamina architecture) studied revealed useful characters which support recognition of the species. A combination of these features has been used to prepare an artificial indented dichotomous key for identifying the species. The generic constant features encountered included hypostomata, paracytic stomatal type, linear nerves endings, uneven midrib outline, and centrally located vascular bundles in the petiole and midrib. However, the most reliable distinguishing characters found across the species included presence of brachyparacytic stomata in A. reticulata, presence of trichomes on the midrib in A. senegalensis, absence of druses on the abaxial surface in A. muricata and A. squamosa, a thick pitted anticlinal walls on the surfaces of A. muricata and consistent polygonal areola shape in A. squamosa. The overlapping characters which also justify the closeness of the species and their grouping in a genus were recorded in both the qualitative and quantitative features. Prominent among them are the mean stomatal width which is about 1.0 μm in all species, nerve endings within the areole which varies between 1-2, U- or V-shaped midrib on the adaxial surface and straight to curved anticlinal wall pattern. The significance of these observations is discussed in updating the existing data in the genus. Keywords: Epidermis, Microscopy, Midrib, Petiole, Systematic

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Anatomía de la semilla de cuatro especies mexicanas de Hippocratea (Celastraceae)

Botanical Sciences ◽

10.17129/botsci.1428 ◽

2017 ◽

pp. 57

Author(s):

Ma. Guadalupe Espinosa-Osornio ◽

E. Mark Engleman

Keyword(s):

Light Microscopy ◽

Seed Coat ◽

Vascular Bundle ◽

The Body ◽

Short Axis ◽

Abaxial Surface ◽

Adaxial Surface ◽

Mature Seeds

The morphology and anatomy of mature seeds of H. acapulcensis, H. celastroides. H. excelsa y H. volubilis were studied by light microscopy. In all four species the seeds are winged and the wing is larger than the body that contains the embryo. The wing may be mostly membranous or mostly thickened by the abundance of isodiametric tracheoidal cells. The vascular bundle of the raphe passes longitudinally through the middle of the wing. Additionally, a bundle of elongate tracheoidal cells passes along one edge of the wing or close by it. The wing has zones thickened by an abW1dance of thick-walled isodiametric tracheoidal cells. The embryo is large with a short axis. The cotiledons are connate and mayor may not maintain the epidermis of the adaxial surface, but cuticle was observed only on the abaxial surface. The seed coat is fomed by an exotesta with tannins, a mesotesta of elongate tracheoidal cells and a tanniniferous endotegmen. There are two thick cuticles, one on the exotesta and one on the nucellus. There are from one to four layers of endosperm.

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Leaf anatomy of the South African Danthonieae (Poaceae). V. Merxmuellera macowanii, M. davyi and M. aureocephala

Bothalia ◽

10.4102/abc.v13i3/4.1356 ◽

1981 ◽

Vol 13 (3/4) ◽

pp. 493-500

Author(s):

R. P. Ellis

Keyword(s):

Light Microscopy ◽

South African ◽

Vascular Bundle ◽

Leaf Anatomy ◽

Related Species ◽

Leaf Blade ◽

Vascular Bundles ◽

The South ◽

Species Groups

Transverse sections and abaxial epidermal scrapes, of herbarium and freshly fixed leaf blade material, of Merxmuellera macowanii (Stapf) Conert, M. davyi (C. E. Hubb.) Conert and M. aureocephala (J. G. Anders.) Conert, were examined using light microscopy. The leaf anatomy o f these three species is very similar in all respects with the exception o f certain M. aureocephala specimens. In addition, the anatomy indicates a relationship between these three species and M. disticha (Nees) Conert. This group of species differs anatomically from M. stricta (Schrad.) Nees, and related species such as M. drakensbergensis (Schweick.) Conert and M. stereophylla (J. G. Anders.) Conert, in the sequence of vascular bundles along the width of the leaf blade and associated characters. However, the M. aureocephala specimens, not having the M. disticha type of vascular bundle arrangement, anatomically resemble the M. stricta group of species, and M. aureocephala appears to be intermediate between these two species groups.resemble the M. stricta group of species, and M. aureocephala appears to be intermediate between these two species groups.

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