Eight strains of Serpula lacrymans were compared in relation to their previously determined factors (5 physiological and 10 toxicometrical). A numerical clustering analysis was used along with, as coefficient of similarity, "cos Q" after standardization of all results. Results with respect to the combined factors showed a mutual similarity within four groups of strains. The first of these groups comprises the English plus Polish strains, the second comprises the German plus one of the Australian strains, the third the Japanese plus two Australian strains and the fourth the remaining Australian strain. Of particular relevance to the testing of wood preservatives is the separation of the 8 strains into just two groups with respect to the toxicometrical factors, with the English, German and the most commonly-used of the Australian strains all being allocated to the one grouping.

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