Developmental and Structural Section
Stevenson, Dennis Wm. .
Slice and Dice Botany: How Cycads Branch.
Branching in extant cycads occurs via the production of “adventitious” buds that arise from callus tissue produced by a phellogen that also gives rise to an abscission layer, via “adventitious” buds produced by the vascular and cork cambia, and from apical dichotomies, which are isotomous. The easiest way to observe the result of apical dichotomies is to examine both transverse and longitudinal sections of mature trunks stained with phloroglucinol. In this manner, in examining an acropetal series, one sees a single vascular cylinder become two equal vascular cylinders (one for each shank of the isotomy). Each successive isotomy occurs at right angles to the previous one, again with a single vascular cylinder dividing into two equal vascular cylinders.
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The Cycad Pages
1 - New York Botanical Garden, 2900 Southern Boulevard, Bronx, NY, 10458, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Ballroom 3/Cliff Lodge - Level B
Date: Monday, July 27th, 2009
Time: 4:00 PM