The chromosomes in Rubus, II
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概要
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(1) The chromosome numbers of eight species of Rubus determined by the writer are as follows:R. Wrightii A. Gray 2n=14, R. palmatoides O. Kuntze 2n=14, R. Commersonii Poir. 2n=14, R. ribifolius Sieb. et Zucc. 2n=14, R. Fauriei Lev. et Vnt. 2n=14, R. trifidus Thunb. 2n=14, R. hakonensis Franch. et Sav. 2n=56 and R. pseudo- Sieboldii Makino 2n=56.(2) The somatic chromosomes of the species mentioned above are so small, that it is difficult to determine the karyotypes of each species. As far as my observation has reached, it is only possible to point out the following facts: In somatic cells, R. Fauriei has a pair of satellite chromosomes, R. ribifolius has a pair of chromosomes with the deep constriction on near its end and R. pseudo-Sieboldii has two V-shaped chromosomes, which are the longest among of its chromosomes.(3) R. pseudo-Sieboldii shows in morphological features almost the middle form between R. Buergeri Miq. (2n=56) and R. Sieboldii Blume (2n=28), but its chromosome number is 2n=56, the same number as that of R. Buergeri, and not equal to the sum of the gametic chromosome numbers of both species.
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