TY - JOUR
T1 - SEM studies on vessels in ferns. 11. Ophioglossum
AU - Schneider, Edward L.
AU - Carlquist, Sherwin
PY - 1999/2
Y1 - 1999/2
N2 - With scanning electron microscopy (SEM), the nature of metaxylem vessel elements and tracheids was examined in Ophioglossum crotalophoroides, O. pendulum subsp. falcatum, and O. vulgatum roots and rhizomes. Vessels were identified in all species. End walls of vessel elements, which bear perforations, are like lateral wall pitting of those elements in the secondary wall framework and differ only in absence of pit membranes or presence of pit membrane remnants. Some of the perforations contain pit membrane remnants that have large pores, small porosities, or are threadlike or weblike in structure. Dimorphic perforations were found in some vessel elements of rhizomes of O. pendulum subsp. falcatum. Tracheids are very likely present in addition to vessels in all three species. The secondary wall framework of both tracheids and vessels is basically scalariform, although deviations in pattern are present. Vessel elements of Ophiglossum are entirely comparable to those of leptosporangiate ferns.
AB - With scanning electron microscopy (SEM), the nature of metaxylem vessel elements and tracheids was examined in Ophioglossum crotalophoroides, O. pendulum subsp. falcatum, and O. vulgatum roots and rhizomes. Vessels were identified in all species. End walls of vessel elements, which bear perforations, are like lateral wall pitting of those elements in the secondary wall framework and differ only in absence of pit membranes or presence of pit membrane remnants. Some of the perforations contain pit membrane remnants that have large pores, small porosities, or are threadlike or weblike in structure. Dimorphic perforations were found in some vessel elements of rhizomes of O. pendulum subsp. falcatum. Tracheids are very likely present in addition to vessels in all three species. The secondary wall framework of both tracheids and vessels is basically scalariform, although deviations in pattern are present. Vessel elements of Ophiglossum are entirely comparable to those of leptosporangiate ferns.
KW - Cusporangiate ferns
KW - Ophioglossaccac
KW - Primary xylem
KW - Tracheary elements
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U2 - 10.1006/bojl.1998.0257
DO - 10.1006/bojl.1998.0257
M3 - Article
AN - SCOPUS:0033009124
SN - 0024-4074
VL - 129
SP - 105
EP - 114
JO - Botanical Journal of the Linnean Society
JF - Botanical Journal of the Linnean Society
IS - 2
ER -