A New Species of Phacidiella Causing the So-Called Phomopsis Disease of Conifers

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Abstract
Phacidiella coniferarum, found to date only on cankered trunks and branches of living apling Pinus strobus in Maine. A taxonomic study of the genus is given together with a discussion of its morphology and conidial relations. Synonyms of the pycnidial stage, Phacidiopycnis gseudotsugae are Phomopsis pseudotsugae M. Wils., P. strobi, Ligniella pinicola, Discula pinicola, and D. p. var. mammosa. The wide geographic and host range of the pathogen is reported in n.e. U. S., on Abies balsamea, Larix decidua, L. leptolepis, Pinus strobus, and Pseudotsuga menziesii var. glauca; in western Europe, on Abies alba, A. procera, Cedrus atlantica, C. deodora, C. libani, Larix decidua, L. leptolepis, L. sibirica, Picea abies, Pinus contorta, P. mugo, P. strobus, P. sylvestris, Pseudotsuga menziesii, P. m. var. glauca, Sequoia gigantea, and Tsuga heterophylla; in Russia, on Pinus sylvestris; in New Zealand, on Pinus canariensis, P. muricata, and P. radiata. Culture studies of isolates from Europe, New Zealand, and the n.-e. U. S. indicate two physiological strains. The sp. apparently reproduces itself in the asexual stage particularly as a canker-dieback parasite on exotics in different parts of the world.

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