SEM Studies on Vessels in Ferns. 20. Hawaiian Hymenophyllaceae
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2000-10
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University of Hawai'i Press
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Abstract
Tracheary elements of three species (Mecodium recurvum,
Vandenboschia devallioides, and Callistopteris baldwinii) (two epiphytic, one
terrestrial) representing three genera of Hymenophyllaceae were studied with
scanning electron microscopy (SEM). Both roots and rhizomes of all three
species possess vessel elements. Wide perforations, an expression of pit (perforation)
dimorphism within perforation plates, are prominent, more so than in
most other fern families. Monomorphic perforations are also common, as are
perforations in which weblike or porose pit membranes are present. Habitats
of Hymenophyllaceae are characterized by high humidity with little fluctuation.
However, fluctuation in moisture availability within the substrates of Hymenophyllaceae
may be related to the abundance of vessels and the distinctiveness of
the perforation plates. A peculiarity of hymenophyllaceous tracheary elements
not hitherto reported in ferns to our knowledge is reported: gaps in the secondary
wall pattern at outer surface of cell angles. These gaps take the form of
rhomboidal depressions or a continuous depressed strip.
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Carlquist S, Schneider EL, Lamoureux CH. 2000. SEM studies on vessels in ferns. 20. Hawaiian Hymenophyllaceae. Pac Sci 54(4): 365-375.
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