. Les contributions du Laboratoire de Botanique et l'Arboretum Morris de l'Université de Pennsylvanie, tome 14. Botanique ; botanique. j'^ â ¢ 30 Phytopathologie [Vol. 27 UN >â â ¢ k. 1937] CniLDS VaRLVBILITY SCnWEINITZII : de PoLYPORUS 31 peuplements vierges il a été appelé à devenir relativement sans importance. Sa de- structiveness à Springwater et dans un sapin Douglas plantation près de Biltmore, North Carolina, (6) l'indique, cependant, qu'il peut constituer un obstacle sérieux à l'utilisation de conifères dans le reboisement artificiel, au moins sur certains sites. Une enquête de sa variabilité a, therefo

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. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. i ^ ⢠30 Phytopathology [Vol. 27 A >â ⢠k. 1937] CniLDS: VaRLVBILITY of PoLYPORUS SCnWEINITZII 31 virgin stands it was expected to become relatively unimportant. Its de- structiveness at Springwater and in a Douglas fir plantation near Biltmore, North Carolina, (6) suggests, however, that it may constitute a serious obstacle to the use of coniferous species in artificial reforestation, at least on certain sites. An investigation of its variability has, therefore, been un- dertaken to determine to what extent specialized strains may be responsible for damage to young trees. Certain preliminary observations are pre- sented here. Final conclusions will be possible only when the results of field studies, already inaugurated, become available. SOURCES AND DESCRIPTIONS OF CULTURES It was the writer's practice to make several isolations from each sporo- phore or infected tree from which a culture of the fungus was desired. More than 100 isolations, representing 25 sporophores and 9 trees, were thus secured and cultured on nutrient agar under closely comparable conditions. With 2 exceptions, isolations from any given tree or sporophore were indis- tinguishable from one another, but differed more or less distinctly from those from any other source. It, therefore, was assumed that similar isolations from the same source were derived from the same individual mycelium, i.e., were members of the same clone, and that dissimilar isolations were derived from genetically different mycelia. These mycelia, together with those obtained from other workers, Avill be referred to by the following numbers: 1 to 30, inclusive. From Pinus stroMis; Springwater, N. Y. 31. From Finns strohus (lesion on 0.5 cm. root of an 8-year-old planted tree) ; Honeoye Lake, N. Y. ; Weston, Ontario. ; Lake Timagami, Ontario. ; Harvard Forest, Petersham, Mass. ; Brattlebo

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