L. Hably szerk.: Studia Botanica Hungarica 23. 1992 (Budapest, 1992)

Givulescu, R.: A new contribution to the knowledge of the fossil flora at Anina, Romania

MACROSCOPIC DESCRIPTION Several leaf fragments with folioles of different but approximately equal sizes. The folioles exhibit perfectly parallel edges with acute top. They are very close to each other (no empty spaces in between, or at a distance of 0.5-1 mm) on the thin rachis which is either hardly visible, or entirely covered by the lower part of the folioles. This lower part of the folioles is truncated. The angle of insertion varies between 47°-59° and 70°. The nervation is extremely fine and consists of a great number of parallel nervures which do not seem to branch out either in the lower part or higher up. MICROSCOPIC DESCRIPTION Hypos tomatic leaves. The upper epidermis is formed of parallel rows of round isodiametrical cells whose walls are more-or-less cutinised. These cells have a starlike shape, i.e. they exhibit deeply lobate edges. The lobation has the shape of a finger which penetrates close to the centre of the cell. The centre is covered by papilla. As a whole, the cells look like intermeshed gears. The lower epidermis is formed of regular parallel rows with and without stomatas. In general the former are narrower. The rows which lack stomatas consist of small, round cells with irregularly waved anticlinal walls which are, at the same time, thicker than the periclinal walls, the latter being thinner and less cutinised. These cells are characterised by strongly cutinised papilla which may be simple, i.e. looking like a cutinised button, or this button may be surrounded by a ring which is also cutinised. A row which has no stomatas consist of 2-4, or even 5-6 rows of cells. The rows with stomatas consist of oval or round cells with less foulded edges, but they also exhibit the characteristic papilla. The stomata are placed in 2-3 rows; the rows are not always defined, their arrangement is comparatively irregular. In general they are directed transversally with respect to the row axis. The stomatic apparatus is of sindetocheil type. It has a round, seldom square shape. The guard cells have a half-moon shape. They exhibit a clearly visible outer edge which is curved. The extremities are sharp. Between the extremities are inserted two pairs of white cells. On these guard cells are placed the two papillae of the subsidiary cells under the form of two very specific and cutinised oval spots. The subsidiary cells are thin and they usually have a crescent like shape. It is known that they overlap the guard cells. The pore is long and narrow. It can be totally or partially covered by the two above-mentioned papillae which may touch each other above the pore.