Acta Botanica 33. (1987)
1987 / 1-2. szám
ACTA BOTANICA 33/1-4 1987 CONTENTS Coenotone, ecotone and their role in preserving relic species (B. Zólyomi) ............................. 3 Facies and their responses to perturbation in a turkey oak-sessile oak wood (G. Fekete, Klára Virágh, A. Horánszky)........................................................................................................... 19 Ecological observations on aquatic Hyphomycetes of Hungary, III. (J. Gönczöl) ............... 41 The effect of S02, SO§~ and SO|— treatment on photosynthesis and chlorophyll content in protonema of Funaria hygromelrica (J. Krupa, E. Talka) ........................................... 51 Adaptive responses of woody introducents in the Botanical Gardens of Yerevan (Soviet Union) and Vácrátót (Hungary). ( V. V. Kazaryan) .............................................................. 59 Chloridium carpaticum, a new species with brown pigmented conidia (Vera Holubová-Jechova, Agnes Révay) .....................................................................__.............................................. 63 New or interesting Hyphomycetes on forest litter from Hungary ( Agnes Révay) ................. 67 Hifomicetes de Topes de Collantes, Cuba, II. Espécies enteroblásticas (J. Mena Portales, A. Mercado Sierra) ............................................................................................................................ 75 LM and EM studies on pollen grains of recents Welwitschia mirabilis Hook, and Ephedra species (M. Kedves) .......................................................................................................................... 81 Studies in Rondeletieae (Rubiaceae), IX. Cinco especies nuevas del género Rondcletia L. en Cuba (A. Borhidi, Maira Fernandez Zequeira) ................................................................ 105 Statistical relationships between the ordination of coenological relevés and characteristic indicator values (I. Bagi) ................................................................................................................. 199 Structure, origin and development of the extra floral nectaries of Pithecellobium dulce Benth. (Mimosaceae) (Y. S. Dave, A. R. S. Menőn) ............................................................ 117 A comparison of the germination characters of Desmodium species (S. C. Datta, Sona Sen) 125 Case study on tumor-like formation on the leaves of sunflower (Helianthus annuus L.) ( F. Herdi) ............................................................................................................................................. 133 The main vegetation units of Cuba (A. Borhidi) ................................................................................. 151 The macrophyte vegetation of a small branch-system of the Danube at Dunaremete (Szigetköz, river km 1826) (Borbála Ráth) ...................................................................................... 187 Studies on the competition between Plantago indica L. and Scabiosa ochroleuca L.(L. Körmöczi) ..................................................................................................................................................... 211 Ecophysiological studies of the relationship between heavy metal toxicity and nitrogen nutrition in the early development stage of winter wheat (G. Fábián, M. Dézsi-Dévay) 219 The influence of Cu2+ and pH on the mutagenic effect of ethylenamine and on chromosome aberrations on barley (T. Pusztai) .................................................................................... 235 Damaging effect of hormone-base herbicide on the petiole of Acer negundo L. (F. Herdi) 239 A phytogeographic review of Tortula Hedw. sect. Rurales De Not. (Pottiaceae, Musci) in Hungary (Z. Tóth) ...............................................................................................................................249 Ecology, cenology and distribution of the giant puff-ball (Langermanniagigantea [Batsch ex Pers.] Rostk.) in Hungary (I. Rimóczi) ....................................................................................279 Macentina borhidii eine neue foliicole Flechte aus Tansania (Edit Farkas, A. Vezda)..........295 Studies in Rondeletieae (Rubiaceae), X. New combinations of Central American taxa (A. Borhidi) ..........................................................................................................................................301 Chromosome morphology and DNA-content in the systematics of the Scilla bifolia aggregate (Z. Kereszty) .............................................................................................................................. 305 Supplementary investigations into the range of relation of angiospermous species on the basis of the proline concentration of pollen (G. Pálfi, S. Gulyás) ....................................317