Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 65. (Budapest 1973)
Kováts, D.: Anatomical investigations on the vegetative system of Lithospermum purpureo-coeruleum L.
frequent (Plate I, Pig. 3). Epidermal cells covered with thick cuticle (also on leaves, cf. Plate VIII, Figs. 2-4). An especially thick cuticular layer within the genus was established in Lithospermum fruticosum L. (JODIN 1903). Cortex of hypogeous shoots and rhizomes shredding together with epiderm owing to frequent thickenings (lignification) and hypogeous conditions (Plate I, Pig. 2). Paracambium (phellogen) producing a multiscriate periderm (suberous epiderm), sheathing rhizome exteriorly. Several years old rhizome bordered generally by 5-10-seriate periderm (Plate I, Fig. 2). Cortex Cortical cells with large lumen, thin-walled, their cross-sections largely circular, often elongated tangentially (Plate I, Figs. 3 -4; Plate II. Figs. 1 -3). Developed epigeous shoots with generally 5-10-seriate cortical parenchyma; projecting ribs occasionally also 15-seriate (Plate I, Figs. 3-4), outermost 2-3 cellular rows consisting of angulate and lamellar collenchyme (Plate I, Fig. 4; Plate II, Fig. 1). In some cases collenchyme formation icocuring also in medan cellular rows of cortex (Plate II, Fig. 1). Literature carries the description of collenchyme in some genera (JODIN 1903). Lumen of cortical parenchymatous cells growing interiorad; increase of volume decreasing thickness of cell walls. (JODIN considers this phenomenon as generally characteristic of the genus; 1903). In Lithospermum purpureo-coeruleum L-, cells interior to median line of cortex possessing largest lumen and thinnest cell walls (Plate I, Figs. 3-4; Plate II. Figs. 1-2). The walls of some inner, tangentially elongated of cortical parenchymatous ceUs arranged 1 -2-seriately, so thin and hardly resistant as to show a zig-zagged decurrence (probably owing to the external mechanical pressure suffered during the preparation of slides) (Plate II, Fig. 2.). In most of the cross-section levels, intracellular passages generally tri- or quadrangular, depending on their location at the meeting of 3 or 4 cells. Triangularly shaped intercellular passages more frequent, also indicating that cortical parenchymatous cells not arranged in radial rows (Plate I, Figs. 3-4; Plate II, Figs. 1 -2).. Quadrangular intercellular passages also occuring, occasionally shaped like dumbbells ; sexangular intercellular passages w T ere also found, at the meeting of six cells.. Longitudinal section of cortical parenchymatous cells elongated in direction of longitudinal axis; their lengths in many cases seven- to eigntfold of their width. Starch sheath appearing as innermost cellular row of cortex, in accordance with endoderm of root. Stele Diameter of stele in developed shoots generally more than twofold of bilateral cortical diameter at the same level (Plate I, Fig. 3). A great part of stele filled by pith parenchyma, with phloem, cambium and xylem constituting only a narrow ring (Plate I, Fig. 3-4). In a primary state, thus also in epicotyl of seedlings, vessel elements fascicular in structure (KOVÁTS 1971). Each radial row of vessels separated from next one by a row of parenchymatous cells (Plate II, Figs. 1, 3), thus procambium probably fascicular in structure, and a contiguous vessel ring system forming only appearance of secondary elements.
