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1 April 2008 Observations on Tracheary Elements in Salpichlaena J. Sm. (Blechnaceae, Pteridophyta)
MarÍa L. Luna, Gabriela E. Giudice, ElÍas R. de la Sota
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The morphology of the tracheary elements of the climbing fern Salpichlaena (Blechnaceae) were analyzed by means of LM and SEM. Two preparative techniques were employed: maceration and sectioning. Under SEM macerated tracheary elements from roots, rhizomes and leaf rachises showed large scalariform perforations lacking pit membranes, thus constituting apparent perforation plates. The perforations showed terminal as well as lateral positions. “Multiple end-wall” and “intermittent” perforation plates were also observed. In sectioned material tracheary cells exhibited mostly intact pit membranes conforming tracheids with scalariform and circular to oval wall pitting. In roots, true perforations seemed to be present in some tracheary cells. A different degree of pit membrane perforations were registered in both macerated and sectioned material, thus suggesting the existence of “incipient vessel elements”. According to our observations macerations produce alterations in the xylem tissue, which can lead to misinterpretations.

MarÍa L. Luna, Gabriela E. Giudice, and ElÍas R. de la Sota "Observations on Tracheary Elements in Salpichlaena J. Sm. (Blechnaceae, Pteridophyta)," American Fern Journal 98(2), 61-70, (1 April 2008).[61:OOTEIS]2.0.CO;2
Published: 1 April 2008
incipient vessel elements
pit membrane
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