Term
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Definition
| Contain oils and occur in vascular or ground tissues. |
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Term
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Definition
| Are modified parts of leaves at the leaf margins/tip that function to discharge excess water to the leaf surface via guttation. |
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Term
| Internal Secretory Structure |
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Definition
Include secretory cells, secretory cavities and canals, and laticifers.
The major types of secretory cells are Oil cells, Resiniferous cells, and Mucilage cells. |
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Term
| Schizogenous Secretory Cavity |
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Definition
| The formation of a space by the separation of cells. |
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Term
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Definition
| Cells or series of connected cells containing latex. Are 2 types of laticifers simple and compound. Occur most dominantly in phloem tissue. |
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Term
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Definition
| Glands that have more complex structures than simple glands. Consist of many secretory cells and protect dormant buds. Develop on the leaf primordia. |
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Term
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Definition
| One typ of cell differentiated by a single epidermal cell. Epithelial cells separate from one another and secrete oil into the inter-cellular space. |
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Term
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Definition
2 types: Floral Nectaries - Occur on floral parts.
Extrafloral Nectaries - Occur on vegetable parts.
Appear as parts of secreting epidermis, and are differentiated into specialized structures. Have a secretory tissue that is covered with a cuticle. Secretes sugars. |
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Term
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Definition
| Also known as simple glands, are composed of one or very few cells. May have a multicellular head with a cuticle layer, have few glandular cells, and can have a unicellular glandular head. |
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Term
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Definition
| Large secretory cells covered by epidermal cells. They secrete to the outside through open stomata. Common in leaves and young stems. |
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Term
| Lysigenous Secretory Cavity |
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Definition
| The formation of a space by the destruction of cells. This is often achieved by enzymatic dissolution. |
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Term
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Definition
| The modified mesophyll of a hydathode. Are usually composed of chlorophyll-free parenchyma and are commonly transfer cells. |
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Term
| External Secretory Structure |
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Definition
| Occur partly or completely on the surface of a plant. Function in secretion. |
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Term
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Definition
Forms in the region of the future vascular tissue. Has predominantly longitudinal divisions and has elongated and narrow cells.
Lies just inside of the protoderm and develops into primary xylem and primary phloem. It also produces the vascular cambium, a secondary meristem. |
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Term
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Definition
| Is the precursor of the epidermis, and constitues the outermost layer. Has anticlinal divisions and forms the epidermis. |
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Term
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Definition
| Occupies the regions of the future pith and cortex (central region). Has both transverse and longitudinal divisions. Contains less elongated, wider and more vacuolated cells. Differentiates into the cortex and pith. |
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Term
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Definition
| Consists of initials and their immediate derivatives. Has 3 segments protoderm, ground meristem, and procambium. Becomes progressivelyy differentiated as it is farther from the apical meristem. |
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Term
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Definition
| Occur in more than one ring in some species. Can be found scattered throught the vascular tissue. |
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Term
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Definition
| The xylem surrounds the phloem. Occurs in certain positions in the stems of some dicots and monocots. |
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Term
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Definition
| The phloem surrounds the xylem. Most common in ferns and angiosperms. |
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Term
| Primary Elongation Growth |
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Definition
| Occurs chiefly in the internodes. As the internodes grow they elongate the stem. The nodes are very close to each other near the stem tip. |
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Term
| Primary Thickening Growth |
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Definition
| Occurs in the pith and/or cortex via periclinal divisions and cell enlargement. The extent of the growth varies with different plants. |
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Term
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Definition
| The prevalent arrangement in which phloem occurs to the outside of the xylem. |
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Term
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Definition
| The phloem occurs to both the outer and inner sides of the xylem. |
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Term
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Definition
| A form of cambial initial that is spindle shaped. They form the axial system of secondary vascular tissue. Divide periclinally. |
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Term
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Definition
| The continuous sheath between the xylem and phloem containing 2 forms of cambial initials: fusiform and ray initials. |
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Term
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Definition
| A fusiform initial arrangement in which they form horizontal tiers. The fusiform initials themselves are shorter and less overlapping. Common in tropical species. More evolutionarily advanced than nonstoried cambia. |
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Term
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Definition
| Cambial initials may produce cells towards the phloem and the xylem alternately. |
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Term
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Definition
| Have overlapping ends of fusiform initials and have much longer fusiform initials than storied cambium. |
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Term
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Definition
| In secondary vascular tissues, a ray that is one cell wide. |
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Term
| Pseudotransverse division |
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Definition
| A type of multiplicative division in species with nonstoried cambia. Daughter cells elongate by apical intrusive growth leading to the increase in cambium circumference. |
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Term
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Definition
| Form the radial system of stems and roots. They are slightly elongated to nearly isodiametric. May produce storied or nonstoried rays. |
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Term
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Definition
| Contribute to the circumference increase of the cambium. Multiple daughter cells are created simultaneously by the devision of the mother cell. |
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Term
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Definition
| Located between the vascular bundles. Forms new cells to both the inside and the outside. |
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Term
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Definition
| Has a continuous vascular cambium with both fascicular and narrow interfascicular regions. Produces a continuous cylinder of secondary xylem and phloem. |
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Term
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Definition
| Phloem tissue that divides to fill the gaps caused by secondary phloem growth, prior to when it becomes fully mature. |
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Term
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Definition
| Located with the vascular bundles. Divides and produces the secondary xylem and secondary phloem tissue. |
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Term
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Definition
Brings many changes to tissues outside and inside the cambium.
Inside- Tracheary elements become dysfunctional, protoxylem may become completely crushed, the pith becomes deformed.
Outside- The primary phloem becomes non-functional, protophloem are crushed. |
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Term
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Definition
| Phloem tissue that lies between regions of secondary xylem. |
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Term
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Definition
| Plant structures that have been modified to serve the same function as leaves. |
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Term
| Anomalous Secondary Growth |
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Definition
| Produce vascular cambia to the outside of the plant as the internal vascular bundles become less active. Sometimes produce vascular bundles and parenchyma cells internally and only parenchyma to the outside. |
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Term
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Definition
| Some monocots increase their trunk diameter due to division and enlargement of parenchyma cells |
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Term
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Definition
| Secondary Growth occurs from several vascular cambium. Very rare, but can be found in some woody species. |
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