The genus Rhabdocline Syd.

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Abstract
The various entities included under the name Rhabdocline pseudotsugae Syd., the fungus causing a needle cast of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco), have been placed into two species primarily on the basis of differences in structure of their ascus apices. The ascospores of Rhabdocline pseudotsugae (which includes R. pseudotsugae subsp. pseudotsugae and R. pseudotsugae subsp. epiphylla subsp. nov.) are ejected through variously ruptured thin-walled ascus apices, while ascospores of Rhabdocline weirii sp. nov. (which includes R. weirii subsp. weirii, R. weirii subsp. oblonga subsp. nov., and R. weirii subsp. obovata subsp. nov.) are ejected through distinct annular pores. An emendment to the diagnosis of Rhabdocline has been made. R. weirii subsp. weirii was the only entity found to be associated with the imperfect fungus Rhabdogloeum pseudotsugae Syd. The relationship of Rhabdocline to other members of the Hemiphacidiaceae, the significance of the constancy of the fungus and disease symptoms in Europe, the iodine reaction of asci, and spore maturity are discussed.
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