Acta Botanica 37. (1992)

1992 / 1-4. szám

ACTA BOTANICA HUNGARICA 37/1-4 1992 CONTENTS Contribution to the study of Streptomyces violascens from the Australian forest environment (L. Gerrettson-Cornell) .......................................................................................... 3 Studies on the powdery mildew fungus, Sphaerotheca fuliginea: Ultrastructure and host responses (Z. A. M. Baka, H. S. Aldesuquy) ............................................................................. 15 El género Alternaria (Hyphomycetes, Deuteromycotina) en Cuba (A. Mercado Sierra, J. Mena Portales) ........................................................................................................................... 33 Nuevos о raros hifomicetes de Cuba VII. Especies enteroblásticas (A. Mercado Sierra, J. Mena Portales) .............................................................................................................................. 63 New names and new species in the Flora of Cuba and Antilles, IV (A. Borhidi) ...................... 75 A new Erythroxylum species in Cuba (R. Oviedo Prieto, A. Borhidi) ............................................ 91 A review of Brazilian representatives of the chrysotricha species group in the genus Tabebuia Gomes ex DC. (Bignoniaceae) (J. Pacit).................................................................. 95 Ekmaniopappus Borhidi gen. novum (Senecioneae, Asteraceae) in Hispaniola (A. Borhidi, E. Gondár, T, Kiss, Zs. Orosz-Kovács) ................................................................................ 105 Phytoplankton studies in the Keszthely Bay (Lake Balaton, Hungary, 1983—1987) (É. Viz­kelety) ................................................................................................................................................. 119 Is there vegetation continuum in mangrove swamps? (Imoh Ukponq) ............................................... 151 Ontogenetic characteristics in flowers of some plum cultivars (D. Suranyi) .......................... 161 Xylotomical study of some Venezuelan tree species (Mimosaceae I—IV) (K. Babos, L. 3. C. Cumana) ................................................................................................................................................. 183 Architecture of the shoot system of Quercus petraea (Matt.)Liebl. (M, Nagy) ...................... 239 Cytological study of anthocyanin production in grapevine (Vitis vinifera L.) callus cultures (3. Pasik, В. Vancová) ...................................................................................................... 251 Histomorphological studies of tracheary elements and chemical composition of Khava ivorensis A. Puss. (Meliaceae) (E. E. Okoegwale, L. 5. Gill) .......................................... 261 Internal seed structure of selected vegetable species (R. Holubowicz, K. Rata.jczak, K. Kryslak) ......................................................................................................................................... 267 Preliminary studies on possible Ni-hyperaccumulator plants of Cuba (A. Borhidi. A. 3. M. Baker, M. Fernandez Zequeira, R. Oviedo Prieto) ................................................................... 279 Simple in vitro propagation of insectivorous plants (M. E. Csányi, К. Вепуб, E. K. Tóth) 287 Effects of carbon sources on the morphology and structure of Scencdesmjs acutus Meyen (F. Nagy-Tóth, L. I. Péterfi, L. Fodorpataki) ............................................................................ 295 MAGYAR TUDOMÁNYOS AKAOáM*A KÖNYVTARA

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