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Schematic drawings of the most common types of collenchyma. (A) Angular collenchyma. (B) Tangential collenchyma. (C) Annular collenchyma. (D) Lacunar collenchyma. This type often occurs as an intermediate type with angular and lamellar collenchyma, in which the size of the intercellular spaces can vary from minute spaces (1) to large cavities surrounded by collenchymatous walls (2).  

Schematic drawings of the most common types of collenchyma. (A) Angular collenchyma. (B) Tangential collenchyma. (C) Annular collenchyma. (D) Lacunar collenchyma. This type often occurs as an intermediate type with angular and lamellar collenchyma, in which the size of the intercellular spaces can vary from minute spaces (1) to large cavities surrounded by collenchymatous walls (2).  

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Background Collenchyma has remained in the shadow of commercially exploited mechanical tissues such as wood and fibres, and therefore has received little attention since it was first described. However, collenchyma is highly dynamic, especially compared with sclerenchyma. It is the main supporting tissue of growing organs with walls thickening duri...

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... angular and annular col- lenchyma is often difficult, especially when massive thicken- ing occurs causing the lumen to lose its angular appearance (Fig. 2F). Therefore, some authors ( Esau, 1965;Fahn, 1990;Beck, 2005) do not recognize this type. Several textbooks also distinguish lacunar (or lacunate) collenchyma (Müller's 'Lückencollenchym') ( Fig. 3D) when thickened cell walls occur adjacent to intercellular spaces (Esau, 1965;Mauseth, 1988;Dickison, 2000;Beck, 2005;Evert, 2006). Duchaigne (1955) and Fahn (1990) did not distinguish this type, as they state that intercellular spaces often occur in other collenchyma types. Therefore, intermediate forms occur where, for example, ...

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