Scalariform Perforation-Plate Fine Structure
AbstractMicrofibrillar webs were frequently observed to connect adjacent bars of scalariform perforation plates of secondary xylem from a variety of tree species. When present, these webs occur most often in the lateral extremities of scalariform openings, where the microfibrils are in somewhat random alignment and hence are named reticulate microfibrillar webs. The number of strands increases and they appear more interwoven in openings near ends of plates. As the number of strands increases, reticulate webs in end scalariform openings grade into typical intervessel pit membranes composed of randomly oriented microfibrils. In certain species, microfibrils may also occur at fairly regular intervals across scalariform openings and exhibit a preferred orientation perpendicular to the bars. These were named orthogonal microfibrillar webs.
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