Developmental and Structural Section
Schneider, Edward , Carlquist, Sherwin , Carlquist, Sherwin .
SEM studies on tracheids of Lycopodiaceae.
Scanning electron microscope (SEM) studies of stem and strobilus longisections of Huperzia, Lycopodium, and Phylloglossum were undertaken to explore ultrastructure of pit membranes in tracheids. The membranes do not characteristically have pores and may often lack cellulosic fibrils. Some pit membranes in Lycopodiuum did show cellulosic fibrils. Porose membranes were seen in some tracheids, an appearance probably related to scraping away of layers in pit membranes by the sectioning process, or in other cases, artifact formation. Metaxylem tracheids have wide borders on pits. Truly "reticulate" metaxylem tracheids are few. Protoxylem tracheids have helices with borders in Huperzia and Lycopodium, but in Phylloglossum, protoxylem annuli and helices are non-bordered.
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1 - University of Minnesota, Twin Cities, Minnesota Landscape Arboretum, 3675 Arboretum Dr., Chaska, MN, 55318, USA
2 - Santa Barbara Botanic Garden, 1212 Mission Canyon Dr., Santa Barbara, CA, 93105, USA
pit membranespit membranes
Presentation Type: Oral Paper:Papers for Sections
Location: Union D/Hyatt
Date: Tuesday, July 10th, 2012
Time: 1:45 PM