Bicollateral Bundle

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bicollateral bundle

[‚bī·kə′lad·ə·rəl ′bənd·əl]
A vascular bundle in which phloem is located both externally and internally with respect to the xylem, with all tissues lying on the same radius and with the internal phloem lying next to the pith.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Bicollateral Bundle


(in plants), a conducting bundle in which two shafts of phloem adjoin the wood from the outer and inner sides. The bicollateral bundle consists of one complete collateral bundle and a closely adjoining incomplete bundle. A bicollateral bundle is characteristic of the stems of members of the Cucurbitaceae and Solanaceae families.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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lingulata presents bicollateral bundles in the midrib (Figure 2F).
Bicollateral bundles (Figure 3D) occur in six species, except N.
Trichomes on petiole apex + - - - Layer of chlorenchyma 4 4 4 4 Type of collenchyma annular annular annular annular Astrosclereids + + + + Elongated sclereids - - + - Tubular sclereids - - + - Columnar sclereids - - - - Bundles in midrib 2 2 2 2 Inverted phloem - 1 - 1 Bicollateral bundles in the blade - - - - Bicollateral bundles in the petiole 2 2 2 1 Species Characters N.L.