Regula, I.: Professor Zvonimir Devidé  -on the occasion of his 80th birthday ......................111

Haupt, W.: Photomovement in plants and microorganisms: old and new questions............. ....121
Ljubešić, .N., Wrischer, M., Prebeg, T., Brkić, D.: Carotenoid-bearing structures
        in fruit chromoplasts of Solanum capsicastrum Link.........................................................131
Wrischer, M., Prebeg, T., Magnus, V., Ljubešić, N.: Ultrastructural study of
        chromoplast components rich in glycolipids........................................................................141
Camloh, M., Vilhar, B., Žel, J.: Jasmonic acid induces changes in growth and
        polypeptide composition of fern gametophytes...................................................................149
  Jelaska, S., Bauer, N., Kosor, E., Leljak-Levanić, D.: Efficient shoot
        organogenesis of begonia (Begonia rex Putz.) induced by thidiazuron ................................157
  Pevalek-Kozlina, B., Prolić, M.: Differentiation and morphogenetic potential of
        Allium commutatum Guss. callus tissue............................................................................169
Besendorfer, V., Šop, C., Šolić, M.,E., Papeš, D.: Karyotypes of Allium senescens
        L. ssp. montanum (Fries) Holub populations from the Mt. Biokovo region ........................177
Wonisch, A., Tausz, M., Weidner, W., Gündhardt-Goerg, M.S., Grill, D.: Effects
        of elevated CO2 on chloroplast pigments of spruce (Picea abies) and beech
        (Fagus sylvatica)  in model ecosystems as modified by provenance, soil type and
        nitrogen supply .................................................................................................................187
Müller, M., Zechmann, B., Tausz, M., Brendle, K., Zellnig, G.: Effects of
        exogenous glutathione on suspension callus cells of spruce [Picea abies (L.) Karst.] .........  197
Lepeduš, H., Ljubešić, N., Cesar, V.: The effect of 2,4-D on the photosynthetic
        aparatus in cotyledons of spruce (Picea abies L. Karst.) seedlings grown in the dark ........ 211
Krsnik-Rasol, M., Balen, B.: Electrophoretic protein patterns and peroxidase
        activity related to morphogenesis in Mammillaria gracilis tissue culture .............................. .219
  Cesar V., Lepeduš H.: Peroxidase activity, soluble proteins and chlorophyll
        content in spruce (Picea abies L. Karst.) needles affected by cement dust .........................227
Tkalec, M., Mlinarec, J., Vidaković-Cifrek, Ž., Jelenčić, B., Regula, I.:
        The effect of salinity and osmotic stress on duckweed Lemna minor L.............................. 237
Vidaković-Cifrek, Ž., Peškan, T., Žlender, S., Tkalec, M., Regula, I.: Effect of
        calcium chloride and calcium bromide on chloroplasts of Lemna minor L......................... .245
Keresztes, Á., Sárvári, É.: Investigations on the "inverse contrast"of chloroplast
        thylakoids....................................................................................................................... ..253
Klepac, D.: Research on diameter growth and increment of some Mexican pines ..................267
Dunkić, V., Bezić, N., Mileta, T.: Xeromorphism of trichomes in Lamiaceae species ........277
Greilhuber, J., Temsch, E.M.: Feulgen densitometry: some observations relevant
        to best practice in quantitative nuclear DNA content determination......................................285
Letters

Vernon and Christine Heywood .............................................................................................299
Keith Jones ...........................................................................................................................300

Author index.............................................................................................................................301
Keyword index ........................................................................................................................302