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bicollateral

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bicollateral [ˌbaɪkɒˈlætərəl]
adj
(Life Sciences & Allied Applications / Botany) Botany (of a vascular bundle) having two phloem groups to the inside and outside, respectively, of the xylem


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Among the fossil forms, Fascivarioxylon (Jain, 1962), of the Jurassic of India, has a vascular cylinder with mesarch, bicollateral centrifugal-centripetal bundles, with uniform secondary growth in both directions; and Stem B, found in the Argentinian Cretaceous, has inverse bundles inside the first vascular cylinder.
Anatomy: xylem usually forming a continuous cylinder; internal intraxylary phloem usually present as a continuous ring or as isolated bundles at the pith margin; vascular bundles bicollateral.
 
 
 
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