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Aerenchyma or aeriferous parenchyma [1] or lacunae, is a modification of the parenchyma to form a spongy tissue that creates spaces or air channels in the leaves, stems and roots of some plants, which allows exchange of gases between the shoot and the root. [2] The channels of air-filled cavities (see image to right) provide a low-resistance ...
The ground tissue of plants includes all tissues that are neither dermal nor vascular. It can be divided into three types based on the nature of the cell walls. This tissue system is present between the dermal tissue and forms the main bulk of the plant body. Parenchyma cells have thin primary walls and usually remain alive after they become ...
Lacuna. Section parallel to the surface from the body of the femur. X 100. a, Haversian canals; b, lacunae seen from the side; c, others seen from the surface in lamella, which are cut horizontally. Nucleated bone cells and their processes, contained in the bone lacunae and their canaliculi respectively. From a section through the vertebra of ...
The codex contains lessons from the Gospels of John, Matthew, Luke lectionary (Evangelistarium), with some lacunae at the end. [4] It is complete up to the lesson for July 20 (Eliah), Luke 4:22. The fly-leaf on paper was added with date 1619. [3] It contains musical notes. [3]
The leaves are narrow and linear, translucent, mid or olive green, usually 20–50 mm long × 0.8–1.4 mm wide, but rarely up to 100 mm long and 1.9 mm wide. The midrib often lacks lacunae (transparent areas either side of the midrib) either side of it, and if present, lacunae are restricted to the lower half of the leaf. [5]
Flatworms. Parenchyma is the tissue made up of cells and intercellular spaces that fills the interior of the body of a flatworm, which is an acoelomate. This is a spongy tissue also known as a mesenchymal tissue, in which several types of cells are lodged in their extracellular matrices. The parenchymal cells include myocytes, and many types of ...
Plant development. Important structures in plant development are buds, shoots, roots, leaves, and flowers; plants produce these tissues and structures throughout their life from meristems [1] located at the tips of organs, or between mature tissues. Thus, a living plant always has embryonic tissues. By contrast, an animal embryo will very early ...
Rhizophora apiculata. The tall-stilt mangrove (Rhizophora apiculata) belongs to the Plantae kingdom under the Rhizophoraceae family. R. apiculata is distributed throughout Southeast Asia and the western Pacific islands. It is located exclusively in the mangrove ecosystem due to an affinity to wet, muddy and silty sediments.