Acta Botanica 31. (1985)

CONTENTS Phytogeographic survey of Cuba, I. The phytogeographic characteristics and evolution of the flora of Cuba (A. Borhidi) ............................................................................................... 3 Some properties of rainfall and throughfall water in undisturbed Juniper and Poplar forests in Bugac (Mária Szabó, E. Készéi) .............................................................................. 35 Lichens as indicators of air pollution in the Budapest Agglomeration, I. Air pollution map based on floristic data and heavy metal concentration measurements (Edit Farkas, L. Lőkös, Klára Verseghy) ............................................................................................... 45 Monosulcate pollen grains of angiosperms from Hungarian Albian sediments, II. (F. Góczán, M. Juhász) .............................................................................................................................. 69 A working key to the species of Phytophthora De Вагу (L. Gerrettson-Cornell)...................... 89 Seven species of Ustilaginales, new for Hungary (K. Vánky, S. Tóth, J. Gönczöl, Agnes Révay, Katalin Imre) 99 East African Bryophytes, VII. The Hepaticae of the Usambara Rain Forest Expedition, 1982 (T. Poes) ......................................................................................................................................... 113 East African Bryophytes, VIII. The Musci of the Usambara Rain Forest Expedition, 1982 (R. Ochyra, T. Poes) ................................................................................................................ 135 Studies in Rondeletieae, VIII. Nuevos taxa del género Rondeletia en Cuba (Mayra Fer­nandez, A. Borhidi)................................................................................................................................ 147 New taxa in the Ti7ia-Herbarium of János Wagner (L. Zs. Vöröss) ...................................... 173 Karyotype investigations in Mongolian Agropyrum cristatum (L.) Gaertn. populations, I. Variations of ploidy level and chromosome measurements (Cendsuren Ojunsuren, B. Jankó) ................................................................................................................................................... 181 Karyotype investigations in Mongolian Agropyron cristatum (L.) Gaertn. populations, II. C-band patterns (Cendsuren Ojunsuren, B. Jankó) ................................................................ 189 Cytological investigation of long lasting (several generations) herbicide treatment result­ing sensitivity changes in barley (T. Pusztai) ....................................................................... 199 Character ranking for the Scilla bifolia Aggregate in Hungary by the application of SCAGA, a new technique of categorization (J. Fischer, Z. Kereszty, N. Kiss) .... 205 Adiciones al catálogo de las palmas de Cuba (A. Borhidi, 0. Muniz) ...................................... 225 Phytochrome in a heterophyllic aquatic macrophyte, Potamogeton amplifolius Tuckerm. (E. Pip, S. Gurney, A. Halayko) ................................................................................................. 231 Growth, DNA-histone relations and IAA oxidase activity of normal and tumorous tissue cultures regulated by indole dérivâtes, 2,4-D and kinetin (E. I. Kovács, M. Dió­szegi, J. Heszlényi, Tran Than Thuy, E. Deli) ....................................................................... 239 Regulation of growth characteristics and enzyme activities of normal and tumorous tissue cultures by acridine orange (E. I. Kovács, К. Pál) ................................................ 245 Growth response of plant callus tissue to toxic heavy metal compounds and -ions con­taminating the environment (M. Maróti, J. Bognár) ....................................................... 251 Effect of light and temperature on leaf morphology and productivity in Digitalis lanata Ehrh. (J. Bernálh, P. Tétényi, Zsuzsa Lassányi, Eva Dobos)........................................... 261

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