Abstract
The life history of Chrysomyxa piceae Barclay, the needle rust of spruce, Picea smithiana (Wall.) Boiss, has been worked out. The teliospores are one-celled, like Coleosporium, but germinate by external promycelia, like Chrysomyxa. The rust does not belong to either Coleosporium or Chrysomyxa or any other known genus and is named Ceropsora and described. It is allied to Mikronegeria, Chrysomyxa piceae Barclay becomes the type species of the new genus and is renamed as Ceropsora piceae (Barclay) Bakshi and Singh n. comb.
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