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By Herman Ramaer (auth.)

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1931). Meiosis in diploid and tetraploid Primula sinensis. Journ. Gen. 24, 65. DARLINGTON, C. D. (1932). Recent Advances in Cytology. London. DucKE, A. (1930). Plantes nouvelles ou peu connues de la region amazonienne IV. Arch. d. Jard. Bot. d. Rio de Janeiro, vol. 5, 99. DuCKE, A. ( 1933). I dem V. Val. 6, I. , HEUSSER, C. en ÜSTENDORF, W. (1932). Het identificeeren van Hevea-cloonen op jeugdigen leeftijd. Arch. v. d. Rubberc. I6, I. GEERTS, T. H. ( 1909). Beiträge zur Kenntnis der Zytologie und der partiellen Sterilität von Oenothera Lamarckiana.

In metaphasc plates of somatic divisions in root tips 36 chromosomes were found. 4. In some cultivated clones of Hevea brasiliensis showing partial or total male sterility, irregular meiosis takes place which is coupled with the occurrence of univalents and multivalents; of the latter trivalents are most common. The same irregularities were found in the hybrid of H. Spruceana X brasiliensis. 5. A case of asynapsis in a clone of H. brasiliensis, showing complete female and male sterility, has been described and compared with asynaptic meiosis in other plants.

1933). Chromosome Studies in Anemone I. Cytologia 4, 26. MüLLER ARGOVIENSIS (1873). In Flora Brasiliensis XI, 2, 297. NEWTON, W. C. , and PELLEW, CAROLINE. (1929). Primula kewensis and its Derivatives. Journ. Gen. 20, 405. RAMAER, H. (1932). De kieming van Hevea-stuifmeel. Arch. v. d. Rubberc. I6, 328. RoSENBERG, 0. ( 1917). Die Reduktionsteilung und ihre Degeneration in Hieracium. Svensk. bot. Tidskr. II, 145. RosENBERG, 0. (1927). Die semiheterotypische Teilung und ihre Bedeutung für die Entstehung verdoppelter Chromosomenzahlen.

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