Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
290
HELGE JOHNSSON
figure lias 2ji = 32 and the one lo the right 2/1 = 42. A good picture of
the range of variation shown by the triploid progeny is given in Fig. 2,
which shows one typical leaf from each of 19 plants. All leaf cliaracters
varv here in the liighest degree. This is the case with leaf-si/.e, leaf-form.
serrature, and shaping of the leaf-base. No clear relation has heen
brought out between leaf characters and chromosome number.
Pro-bably, the great variation in the size of the leaves is only in part an
expression of specific »leaf factors» and is lo a larger extent a reflection
of the general vitality of the plants.
Literature cited.
Johnsson, H. 1940. Cylological studies of diploid and triploid Popilius tremula and
of crosses between them — Hereditas XXVI.
— 1942. Cytological studies of triploid progenies of Populus tremula. — Ibid. XXVIII.
— 1944. Triploidy in Betula alba L. — Bot. Not.
— 1945. Interspecific hybridizalion within the genus Betula. — Hereditas XXXI.
Löve, A. 1944. A new triploid Betula verrucosa. — Svensk Hot. Tidskr. .’i8.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
