Wood Anatomy of Byblidaceae
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Abstract
Byblidaceae, as recognized here, consists of two species endemic to Australia, Byblis gigantea and B. liniflora. No data on secondary xylem have hitherto been published, so a detailed description of qualitative and quantitative features is presented for B. gigantea; B. liniflora has very little secondary xylem. The wood of B. gigantea is unusual in having some narrow tracheid-like vessels with one or more small perforation plates. The majority of vessel elements have simple perforation plates, but scalariform perforation plates with one to three bars are frequent. All perforation plates are bordered. Tracheids have fully bordered pits; lignified ray cells have bordered pits. The simple perforation plates probably represent accelerated evolution of a structure adapted to marked seasonal fluctuation in water availability. However, the relatively primitive type of tracheids may be present because of lack of selective pressure for mechanical strength and because of the value of a conductive element resistant to development of air embolisms. Wood anatomy of Byblis is consistent with relationship to Roridulaceae as well as placement in orders variously recognized by phylogenists as Rosales and Pittosporales.
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