B. Papp szerk.: Studia Botanica Hungarica 38. 2007 (Budapest, 2007)

Bercu, Rodica: On the anatomy of the endangered plant species Asplenium lepidum (Aspleniaceae)

CONCLUSIONS The root of Asplenium lepidum has a diarch structure, with modified layers of cortex around the stele and a one-layered pericycle. The rhizome (analysed by serial transversal sections) consists of an epidermis, a parenchymatous cortex and a centrally located dictyostele containing a variable number of meristeles. The leaf petiole and rachis exhibit a differential cortex (a sclerenchymatous hypodermis and an inner parenchyma). Close to the rachis tip the sclerenchymatous hypodermis disappears. Remarkable is the variation in the organisation of the vascular system. At the base of the leaf petiole, the vascular system is distelic (bifascicular) while up to the subterminal rachis the monofascicular stele is X-shaped and T-shaped. The pinnulae have a homogenous mesophyll composed of branched and lobed cells. Remarkable are the glandular papillae (cells) of the upper epidermis. The midrib is collateral possessing a hadrocentric structure. The lower epidermis cells are smaller and possess a number of stomata. REFERENCES ANDREI, M. (1978): Anatomy of plants. - Ed. Didact. Pedagog., Bucuresti, pp. 227-229. BERCU, R. (1998): Anatomical modifications of the corm stele in fern Asplenium septentrionale (L.) Hoffm. - Forestry, Sumarstvo, Belgrade, 1: 35-40. BERCU, R. (2004): Anatomical aspects of Asplenium adiantum-nigrum L. - J. Biol. Res. 2: 57-61. BERCU, R. (2005): Contributions to the anatomy of Asplenium ruta-muraria. - Studia bot hung. 36: 13-20. BERCU, R. (2006): Histoanatomy of the vegetative organs of some species belonging to Polypodiales order. - Ex Ponto, Constanta, 232 pp. (in Romanian). BIERHORST, D. W. (1971): Morphology of vascular plants. - Collier and Macmillan Ltd., London, New York, pp. 296-298, pp. 300-304. BlR, S. S. (1957): Stelar anatomy of Indian Aspleniaceae. - Proceeds Ind. Sei. Congr. Association 44: 232. DE BARY, A. (1877): Vergleichende Anatomie der Vegetationsorgane der Phanerogamen und Farne. - W. Engelmann, Leipzig, 664 pp. KROEMER, K. (1903): Wurzelhaut, Hypodermis und Endodermis der Angiospermenwurzel. - Biblioth. Bot. 12: 151. OGURA, Y. (1938): Anatomie der Vegetationsorgane der Pteridophyten. - In: Handbuch der Pflanzenanatomie, Gebrüder Borntraeger, Berlin, pp. 128-140.