WHITE PINES OF JAPAN 199 



BINGHAM: Having disposed of some generalities, the floor is hereby 

 opened for questions addressed to the four individual panelists. 



CALLAHAM: I should like to ask if anyone knows if isolated stands 



of Asian white pines on the offshore islands of Japan and Taiwan are 



remnants of ancient transfers by man or whether these truly are natural 

 distributions? 



HYUN : I know that the isolated distributions of Pinus koraiensis 

 at high elevations in South Korea are natural, and it is also known that 

 the distribution of P. koraiensis in north-central Honshu of Japan is 

 natural . 



SAHO: In respect to the distribution of Pinus koraiensis in Japan, 

 yes, I think this is an isolated distribution. It covers less than 200 

 square kilometers, with a single outlier to the south at 34° latitude in 

 Shikoku. 



BINGHAM: But Dr. Saho, is there any question that this is not a 

 natural stand of Pinus koraiensis? 



SAHO: These are natural stands, and natural Pinus koraiensis is 

 found nowhere else in Japan. 



CALLAHAM: Is there no evidence that the species was established by 

 man long ago? 



SAHO: No. The earliest plantation was established in 1910. 



VAN ARSDEL: Dr. Dogra isn't here, but I wondered if anybody knows 

 anything about those eastern outliers of Pinus griffithii (P. walliohiana 

 or blue pine) . 



KRIEBEL: I can give you a little more information than I was able to 

 in covering Dr. Dogra' s paper. Dr. Dogra mentions the northeastern blue 

 pine (P. griffithii) found in some regions of Assam, areas in which there 

 is an annual rainfall of 200 inches, as compared, for instance, with 

 stands in areas of the upper Sutlej valley of northwestern India having 

 10 to 30 inches. He also states that the blue pines in northern Burma, 

 on grassy slopes of several valleys in the upper Irrawadi River at eleva- 

 tions of about 4,900 to 6,900 feet, fall into his "moist upper level area", 

 where growth is excellent. Perhaps you may be referring to those "little 

 red X's", on Critchfield and Little's (1966) map 12, i.e., the area where 

 P. griffithii overlaps with P. armandii in northeastern Burma. If so, I 

 don't think Dr. Dogra gave any information on that area. You might be 

 able to get some information from Dr. Chi-wu Wang's book, "The Forests 

 of China." 



VIDAKOVIC: I have a comment on Dr. Dogra 's paper, where he considers 

 incompatibility. When he refers to incompatibility between the provenances 

 of P. walliohiana- -I don't know but I have a feeling that it is only a 

 question of time of ripening of the pollen and of pollination, not really 

 compatibility. 



KRIEBEL: I don't find that Dr. Dogra used the term incompatibility. 

 He refers to reproductive barriers, and is talking about the differences 

 in time of pollen shedding. 



KEDNARNATH: A "functional compatibility barrier" might be a better 

 term. 



