primary xylem

Listing 1 - 10 from 113 for primary xylem

Lab I - Plant Structure (3)
... often crushed or destroyed chemically during preservation), it is the structure of the xylem --particularly primary xylem-- that is of particular interest for paleobotany. Understanding stele types is ... character of stelar development is the maturation of the primary xylem. The earliest maturing xylem cells are called protoxylem. These xylem elements are generally small and narrow. Later maturing ...
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Lab VIII - Medullosans and Cycads (2)
... surrounding different bundles of the eustele rather than surrounding the entire collection of primary xylem as in angiosperms. Medullosa stems have a thick, sclerenchymous cortex with abundant secretory ... differs from Medullosa in having fewer vascular bundles, less well developed wood, and larger primary xylem. The leaf traces also have different structure. Foliage of Medullosa (here referring to ...
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Lab VIII - Medullosans and Cycads (3)
... wood is produced from a bifacial vascular cambium. As the leaf trace arises from the primary xylem sympodium is dichotomizes and the two branches set off in opposite directions. The pair of ...
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Lab X - Anthophytes, Glossopterids and Others (2)
... xylem radiating out from the central zone of exarch primary xylem. The wood wedges are interconnected via transverse "platforms" of wood that commonly contain a root trace. The areas between the xylem ... with five bunches of vascular tissue at the edge of a substantial pith. The primary xylem is mesarch (Middle Pennsylvanian) or exarch (Upper Pennsylvanian). A bifacial vascular cambium forming ...
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Plant Pathology Glossary
... Inoculum inoculum produced by infections that took place during the same growing season. Compare with primary inoculum. Secondary Metabolite a compound that is not necessary for growth or maintenance of cellular ... W X Xylem a complex vascular tissue through which water and minerals are conducted through the plant. Xylem also aids in the structural support of a plant as the primary component of its ...
bugs.bio.usyd.edu.au

Angiosperm Families - Implicit Attributes
... absent. Medullary bundles absent. Internal phloem absent. The secondary phloem not stratified. Xylem without tracheids; without fibre tracheids; without libriform fibres; with vessels. Tile ... . Embryo well differentiated. Testa without phytomelan. Micropyle not zigzag. Seedling. Coleoptile absent. Primary root persistent. Physiology, biochemistry. Nitrogen-fixing root nodules absent. Mustard-oils ...
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Angiosperm Families - Acanthaceae Juss.
... anatomy. Cork cambium present; initially deep-seated (sometimes), or superficial. Nodes unilacunar. Primary vascular tissue bicollateral, or centrifugal. Cortical bundles absent. Medullary bundles present (rarely), ... ‘Included’ phloem absent. Xylem with fibre tracheids; with libriform fibres; with vessels. Vessel end-walls simple. Vessels without vestured pits. Primary medullary rays narrow. Wood ...
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Angiosperm Families - Aceraceae Juss.
... Xylem with fibre tracheids, or without fibre tracheids; with libriform fibres, or without libriform fibres; with vessels. Vessel end-walls horizontal to oblique; simple. Vessels without vestured pits. Primary ... recorded (in one species). Seedling. Germination phanerocotylar, or cryptocotylar (rarely). Primary root persistent. Physiology, biochemistry. Not cyanogenic. Alkaloids present (rarely), or ...
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Angiosperm Families - Aizoaceae Rudolphi
... Mesembryanthemum). Stem anatomy. Cork cambium present, or absent; initially deep-seated. Nodes unilacunar. Primary vascular tissue centrifugal. Internal phloem absent. Secondary thickening absent, or developing from ... ring. ‘Included’ phloem present, or absent. Xylem with libriform fibres; with vessels. Vessel end-walls usually simple. Primary medullary rays wide. Wood partially storied (VP), ...
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Angiosperm Families - Akaniaceae Stapf
... Cork cambium present; initially superficial. Secondary thickening developing from a conventional cambial ring. Xylem without fibre tracheids (the pit borders small and inconspicuous); with libriform fibres. ... , and these with numerous aberrant arrangements of bars). Vessels without vestured pits. Primary medullary rays wide. Wood semi-ring porous (the growth rings inconspicuous); not storied ...
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