Abstract
1. On the stigma, the grass pollen shows about 60-80per cent germination under natural as well as artificial pollination. The pollen grains, which are apparently mature but germinate with difficulty, are densely filled with starch grains, whereas in the pollen grains which are capable of germination the starch grains are decreased at the end opposite to the germ pore. More immature pollen has no germination capacity.2. The germination on immature stigma is not so good as that on mature stigma. The percentage of germination increases as the stigma ripens. As an exception, the maize pollen can germinate well on both mature and immature stigma.3. The liquid that oozes out between pollen grain and stigma cells before the pollen tube emerges seems to be derived from both of the partners, and also to stimulate the pollen germination with some agents contained in it.
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