Abstract
Leptoids (sieve elements) of Dendroligotrichum are characterized by a highly oblique end wall which is composed of cellulose (birefringent; IKI‐H2SO4‐positive), polyuronides (toluidine blue‐positive), pectins (hydroxylamine‐positive) and natural aldehydes (silver hexamine and silver proteinate‐positive). Cytochemically the end wall appears identical to the unevenly thickened lateral wall. Electron cytochemical localization of aldehydes with silver proteinate reveals two distinct wall layers in comparison to the 3‐layered lateral wall. Plasmodesmata are present in the end wall with a frequency of 15‐20 per μm2. A characteristic feature of end wall plasmodesmata is an expanded median cavity which is 0.12‐0.15 μm in diameter. Frequently an electron‐dense substance, whose chemical nature and origin are unknown, occludes the plasmodesmata.
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