Abstract
Carothers, Zane B. (U. Kentucky, Lexington.) Observation on the procambium and primary phloem of Pelargonium domesticum. Amer. Jour. Bot. 46(6): 397–404. Illus. 1959.—Stems of Pelargonium domesticum, a shrubby member of the Geraniaceae, were studied ontogenetically. It was found that a continuous cylinder of procambium is formed within the terminal millimeter of the young shoot. The pattern of trace procambium within this region is illustrated. Three traces are associated with each leaf; nodes are trilacunar. The prominent, sclerous “pericycle,” a diagnostic character of the family, actually consists of protophloem fibers. Commonly septate, these cells may contain as many as 4 nucleate protoplasts. The fibers average 1177 μ in length and 31 μ in diameter. Fiber walls average 5 μ in thickness, the inner pit apertures 6 μ in length. Metaphloem sieve tube elements averaged 203 μ in length.
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