title: [Investigations on the fine structure of the phloem : III. The "trumpet cells" of Laminaria species].
abstract: The trumpet cells in the medulla of the Laminaria-cauloid are living cells with normal organelles and a persistent nucleus. The cross wall consists of a single primary pith field with 20,000-30,000 plasmodesmata of normal structure and dimension. They have a density of 50-60/μm(2). There are indications that the rim of the pores and the surface of the cross wall (beside the pores) are covered with a callose layer.
authors.affiliation: Botanisches Institut der Technischen Hochschule Darmstadt, Darmstadt, Deutschland.
authors.forename: H
authors.initials: H
authors.lastname: Ziegler
authors.forename: I
authors.initials: I
authors.lastname: Ruck
vernacular_title: Untersuchungen über die Feinstruktur des Phloems : III. Mitteilung Die "Trompetenzellen" von Laminaria-Arten.