Rhabdocline Taxa in Pennsylvania. J. McDowell, Undergraduate Plant Science Student, Department of Plant Pathology, Pennsylvania State University, University Park 16802. W. Merrill, Professor, Department of Plant Pathology, Pennsylvania State University, University Park 16802. Plant Dis. 69:714-715. Accepted for publication 30 January 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-714.

Both Rhabdocline pseudotsugae subsp. pseudotsugae and R. weirii subsp. oblonga occur on Douglas-fir in Pennsylvania and southern New York. R. pseudotsugae subsp. pseudotsugae was the predominant species in Pennsylvania north of the Pocono Mountains and was the only species found south of the Pocono Mountains. The pattern of epidermal dehiscence over the apothecium was not a reliable means of separating these two species.