Cytological Features of the Life History of Gymnosporangium juniperi- virginianae

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Abstract
A row of 3 parenchyma-like cells arise from the end of a mycelial thread, the upper one being the buffer cell and the one immediately below it the basal cell. The cytoplasm of the buffer cell disintegrates, and buds of the basal cell grow up into and through the buffer cell. The bud cell divides and forms 2, the stalk cell and the teliospore mother cell. The nuclei of the teliospore mother cell divide, giving rise to a four-nucleate cell. A wall is laid down dividing the cell into 2 daughter cells each containing 2 nuclei. The 2 nuclei in each of the teliospore cells unite, initiating a uninucleate condition. The walls of the teliospores in the outer portion of the teliosorus are much thicker than those toward the center. Upon ripening, each cell of the teliospore sends out a basidium where reduction takes place, four cells being formed as a result of the process. The haploid number of chromosomes is 2, and the diploid 4. Each of the 4 cells of the basidium forms a sterigma, which rounds off to form a basidiospore, the nucleus of each of the cells moving up through the sterigma into the spore. Basidiospores often contain 2 nuclei as a result of a precocious division and the delay in formation of a wall.
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