1. A remarkable outgrowth from the cut surface of epicotyl was found in etiolated seedlings of Stizolobium hassjoo.
2. The attempts to produce such an outgrowth as in S. hassjoo were unsuccessful with Vicia faba and Pisum sativum.
3. The outgrowth has some of the characteristics of plant tumors. a) Its external appearance resembles that of other plant tumors. b) The outgrowth could grow slowly on a medium without addition of growth factor. It seems to be partially autonomous in regard to growth factor. c) It is not differentiated as compared with normal organ, like in other plant tumors.
4. It is a new type of outgrowth different from crown gall, because it is caused without inoculation of Agrobacterium, and formed under aseptic conditions only by cutting epicotyl. The outgrowth naturally differs from genetic tumor or auxin induced tumor.
5. Light seems to be inhibitory to the formation of the outgrowth.
6. When the epicotyl was cut in part (I), no outgrowth was formed from any position of the part. The outgrowth, however, is produced from the lower parts of the epicotyl. This seems to be attributed not to inhibitory principles produced in part (I), but to a complicated reactivity of the cutting position.