Vessels ofIllicium(Illiciaceae): Range of Pit Membrane Remnant Presence in Perforations and Other Vessel Details
Scanning electron microscope (SEM) examination of vessels from radial sections ofIlliciumwood showed a wide range of pit membrane remnant presence within any given species and within the seven species studied here. Earlier studies showed that dried specimens offer a reliable indicator of pit membran... Ausführliche Beschreibung
|1. Person:||Carlquist, Sherwin|
|Weitere Personen:||Schneider, Edward L. verfasserin|
in International journal of plant sciences : IJPS Vol. 163, No. 5 (2002), p. 755-763
ecological wood anatomy
primitive wood features
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1 Author for correspondence.
Copyright: © 2002 by The University of Chicago. All rights reserved.
Scanning electron microscope (SEM) examination of vessels from radial sections ofIlliciumwood showed a wide range of pit membrane remnant presence within any given species and within the seven species studied here. Earlier studies showed that dried specimens offer a reliable indicator of pit membrane presence. In all species, wide variation occurs, from intact pit membranes to perforations virtually free of pit membrane remnants.Illicium parviflorumhas the largest number for the genus of perforation plates, with little or no pit membrane presence, although, in some plates, appreciable pit membrane presence was evident. Species differ in the forms taken by the pit membrane remnants: threads running axially in the perforations are common, but weblike conformations or pit membranes perforated by small circular to oval pores are other commonly encountered conditions. Artifacts attributable to handling and other factors are analyzed to obtain an image of pit membrane presence. Pit membrane remnant presence is consistent with the presence of other strongly primitive features ofIlliciumand its near‐basal position in phylogenetic trees based on molecular data. Unusually narrow and sparse helical thickenings are figured with SEM for the genus for the first time; these thickenings occur in three species from habitats in which winter freezing occurs.