The Comparative Morphology and Development of Isoetes L. I. Lobe and Furrow Development in I. tuckermanii A. Br.

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Abstract
This study deals with 3 aspects of the development of I. tuckermanii. Emphasis is placed on changes that occur in the development of individual plants. These include structural changes associated with aging, the development and maintenance of furrows on the lower part of the plant body, and the addition of new furrows and lobes. The ages of young plants may be estimated from the shapes of their cortical lobes. The ages of older plants may be estimated as the ratio of the height of the entire leaf-bearing stele to the height of that portion produced in the current growing season. Individuals are initially 2 lobed with a single furrow and a bar-shaped basal meristem. Three- and 4-lobed conditions result from the subdivision of lobes by new furrows. New furrows are formed and old furrows are maintained in opposition to circumstelar meristematic activity by a sequence of cell division, elongation and eventual rupture among the cells that become exposed at the bottom of a furrow.

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