关键词: 北桑寄生, 槲寄生, 营养器官, 结构

Abstract: The stem, leaf and haustrum structures were studied in Viscum coloratum and Loranthus tanakae. The triennium stem of Viscum coloratum was a little bit cerneous, no periderm with thick cuticula; cortex had 7 vescular bundles with developed parenchyma; xylem had large amount of parenchyma; phloem developed well; druse and merlicera spread widely in stem. The leaf of Viscum coloratum was cerneous and 1.44 mm thick, cuticula developed well and was 9.06~13.4 μm thick. Leaf had no differentiation of palisade and spongy. The stem of Loranthus tanakae had similar structure to that of normal ligneous, xylem being typical ring-porous wood, phloem with sclerotic, pith cell with thick wall and obvious simple pit. The leaf of Loranthus tanakae was thin and had no differentiation of palisade and spongy, vein developed well. The haustrum structure of the two were similar and both were composed of parenchyma and spiral vessel. Their spiral vessels were of the same length but the diameter of Viscum coloratum was 2.5 times than that of Loranthus tanakae.

Key words: Loranthus tanakae, Viscum coloratum, vegetative organ, anatomy