TY - JOUR
T1 - Pit membrane remnants in perforation plates and other vessel details of Cornales
AU - Schneider, Edward L.
AU - Carlquist, Sherwin
PY - 2004
Y1 - 2004
N2 - Perforation plates and other vessel details as studied with scanning electron microscopy (SEM) have been reported for four species of Cornaceae (s.l.): similar features are shown by the four, suggesting that a more extensive sampling of the family might reveal similar phenomena. Perforation plates contain pit membrane remnants in the form of threads or, less commonly, laminar portions perforated by pores. When least well-represented, the pit membrane remnants are restricted to lateral ends of perforations and to the perforations transitional to lateral wall pitting. Perforations are all clearly bordered. Helical thickenings that do not form a continuous gyre are reported for the vessel walls of Aucuba. The presence of pit membrane remnants in vessel elements of Cornaceae correlates with the mesic habitats occupied by species in this family. The presence and type of pit membrane remnants reported by us in the three genera is very similar, although pit membrane remnants are doubtless a symplesiomorphy and thus not an indicator of relationships. The presence of pit membrane remnants in the three genera, however, does attest to the primitiveness of wood and other features of Cornaceae s.l.
AB - Perforation plates and other vessel details as studied with scanning electron microscopy (SEM) have been reported for four species of Cornaceae (s.l.): similar features are shown by the four, suggesting that a more extensive sampling of the family might reveal similar phenomena. Perforation plates contain pit membrane remnants in the form of threads or, less commonly, laminar portions perforated by pores. When least well-represented, the pit membrane remnants are restricted to lateral ends of perforations and to the perforations transitional to lateral wall pitting. Perforations are all clearly bordered. Helical thickenings that do not form a continuous gyre are reported for the vessel walls of Aucuba. The presence of pit membrane remnants in vessel elements of Cornaceae correlates with the mesic habitats occupied by species in this family. The presence and type of pit membrane remnants reported by us in the three genera is very similar, although pit membrane remnants are doubtless a symplesiomorphy and thus not an indicator of relationships. The presence of pit membrane remnants in the three genera, however, does attest to the primitiveness of wood and other features of Cornaceae s.l.
KW - Cornaceae
KW - Ecological wood anatomy
KW - Garryales
KW - Perforation plates
KW - Phylogenetic wood anatomy
KW - Vessel evolution
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U2 - 10.1663/0007-196X(2004)056[0275:PMRIPP]2.0.CO;2
DO - 10.1663/0007-196X(2004)056[0275:PMRIPP]2.0.CO;2
M3 - Article
AN - SCOPUS:6344285975
SN - 0007-196X
VL - 56
SP - 275
EP - 283
JO - Brittonia
JF - Brittonia
IS - 3
ER -