METHODS of reproduction in fungi have both a general and a special interest-general, inasmuch as reproduction is fundamentally important to all organisms, and special, for the following reasons. As a group, the Fungi exhibit a remarkable variety of reproductive mechanisms, the overall effects of which are to ensure the dispersal of the species to fresh habitats and its survival over periods when growth is not possible. The factors which control reproduction are thus of considerable practical interest in the case of the many fungi which bring about disease in higher plants. They are also of special interest to the fungal systematist, because reproductive mechanisms form the main basis for fungal classification. Furthermore, a large proportion of fungi can be grown under standardized cultural conditions and, as compared with most other plants, they offer great conveniences in ease of handling, in inexpensiveness of apparatus required and in the speed with which the life-cycle of many of them can be completed. It is not surprising, therefore, that much physiological work, dealing with reproduction and other activities, has been carried out with fungi, and it is a safe guess that, in the future, many of the more fundamental studies of growth and reproduction in plants will be based upon the same material.