sclereid


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sclereid

(sklĕr′ē-ĭd)
n.
A thick-walled lignified sclerenchyma cell. Sclereids are variable in shape and are shorter than fibers.

sclereid

a type of SCLERENCHYMA cell of higher plants, which is roughly spherical in shape with a thick wall that can be smooth or spiky and is always heavily impregnated with LIGNIN. Sclereids occur in the flesh of succulent fruits such as pears, and are common in the shells of nuts.
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Caption: Figure 1--Characters of leaf of Camellia sinensis: (A) fresh tea leaves of the plant that was used to collection; (B) midrib in the transverse view showing sclereid (arrow).
Unicellar tectonic trichomes and calcium oxalate druses and sclereids allow the anatomical identification of C.
Some quantitative characters were not taken into account because they increase with age; these include: adaxial and abaxial prominency of the main rib, number of layers of parenchyma cells, of fibrous strands under the adaxial and above the abaxial hypodermis, of layers of sclereids, of chlorenchyma and spongious parenchyma.
Nine differential characters: epidermal cells rectangular (95), oval (96), round in outline (97), with outer wall thick or thin (98, 99); hypodermis with parenchyma (100), sclereids (101) or septate fibers (102); fibrous strands with stegmata (103).
Sclerenchyma generally falls into two categories of cells: fibers and sclereids, or stone cells.
Sclereids are variable in shape, some being highly branched like an octopus, others shaped like a bone, and still others relatively spherical.
At the boundary between the peridermis and the secondary phloem there was a continuous ring of sclereids (Fig.
2H) made the determination of the following cellular elements possible: a) Sclereids: Consisting of polygonal rectangular brachisclereids, 100 [micro]m in length and 40 [micro]m in width; and isodiametric brachisclereids, 50 [micro]m in diameter (Fig.
According to Wiersema (1987), this subgenus is characterised by completely fused carpels, a swollen carpel appendage, and a usually tetramerous arrangement of perianth and outer stames, with or without acicular sclereids.