Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 65. (Budapest 1973)
Kováts, D.: Anatomical investigations on the vegetative system of Lithospermum purpureo-coeruleum L.
mellate and angidate collenchyma (Plate VI, Figs. 2, 4). No change in structure of mesophyll present above or below lateral veins. Rest (other half) of leaf cross-section filled by 4-5-seriate spongy parenchyma, with large intracellular passages. Collecting cells arc frequently present (Plate VI, Figs. 1-3). Petiole, transport tissue system Cross-section of petiole of Lithospermum purpureo-coeruleum L. wing-shaped, with an upper concave and a lower convex (surface distinguishable (Plate VII, Fig. 1- 2). This was established already by JODIN (1903) for the entire family. The bialate picture is characteristic also of the leaf cross-section, together with the concave upper and convex lower surfaces, in Lithospermum purpureo-coeruleum L. (Plate VI, Fig. 2). A lamellar and angulate 1-3-seriate collenchyme extending under axial and abaxial leaf and petiole epiderms (Plate VIII, Figs. 2 -4). In leaves but especially in petioles this collenchyma surrounding petiole smaller interruptions, and heavily aggregating around transport vessels (especiaUy around the median vein) and in apices of the wing-shape (Plate VI. Figs. 2, 4; Plate VII. Figs. 1, 2; Plate VIII. Figs. 1-4). JODIN (1903) also observed a well-developed collenchyma in the petioles of Lithospermum purpureo-coeruleum L. Endoderm generally Casparypunctate (striate) (Plate VI. Fig. 4; Plate VII. Fig. 3; Plate VIII. Fig. Ï). Stele A sclerenchyma ring present around the bundle of petiole, especially above xylem on axial (concave) side (Plate VII. Figs. 3-4). Transport elements of petiole are uniform, collaterally open in structure. The cambial rows of cells are generally 2- 3 seriate, and the whole system is in a bundle sheath (sclerenchyma). The primary xylem generally retaining its fascicular structure in developed (mostly the phloem too), as in the epigeous shoots. Sometimes the secondary xylem seems fascicular in structure too. The transport tissue system extending in a transversal level and being best developed in median level (Plate VII. Figs. 1-4). The transport tissue system of leaf blade is also collaterally open in structure, but the cambial rows of cells are only one seriate (Plate VI. Figs. 2, 4; Plare VIII. Fig. 1). Starting from the petiole towards the leaf blade, two lateral fascicles separate from the median vein. The first lateral (1-1 fascicle) veins, from the median vein, are alw r ays two in number in the other parts of the leaf blade. From the median vein of a developed fohage leaf is always 20 pairs of first lateral veins depart into the leaf blade. To the cusp of a leaf the depart first lateral veins pairs are more frequent. The depart second- and third veins, from the median vein into the leaf blade, forming a network (Plate VI. Fig. 3.). Nylem in all veins situated axially, on concave side of leaf (Plate VI, Figs. 2, 4; Plate VII. Figs. 1 -4; Plate VIII. Fig. 1). Radial primary xylem rows separated by parenchymatous cells from one another (Plate VII, Figs. 3-4). Primary xylem elements deforming and in some cases also closing. Secondary xylem 3-4-seriate also in Lithospermum purpureo-coeruleum L. (as stated by JODIN [1903] also for the entire genus) (Plate VII, Figs. 3-4). Phloem situated abaxially, on convex side of leaf (Plate VI, Figs. 2, 4; Plate VII, Figs. 1-4; Plate VIII, Fig. 1). weakly arcuate in petiole (Plate VII, Figs. 1 -4)
