Development of Synchytrium Innominatum in Relation to Other Similar Species

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Abstract
Synchytrium innominatum is a long-cycled, compositely dihomeogallic species whose initial cell develops directly into a sorus of sporangia. Accordingly, so far as it is known, it appears to be a member of the subgenus Eusynchytrium. The predominantly deep-seated galls are formed usually by a combination of the inward enlargement and growth of the infected cell, inward elongation and division of the adjacent epidermal cells, and division of some of the palisade or mesophyll cells. Three fairly similar long-cycled species which were previously determined as S. innominatum occur on Microseris aphantocarpa, M. biglowii and Scorzonella laciniata in California. These species are compositely dihomeogallic with largely-embedded or deep-seated galls, and their initial cell develops directly into a sorus of sporangia. Although they are similar in these respects to S. innominatum and occur on composite hosts also, it is not certain that they are identical with this species.

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