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SUMMARY
The hymenia in basidiocarps of Pseudotomentella atrocyanea (Wakef.) Burds. et M. J. Larsen, Lasulinospora wakefieldii Burds. et M. J. Larsen, L. cyanea (Wakef.) Burds. et M. J. Larsen, Tomentella botryoides (Schw.) Bourd. et Galz., T. griseoviolacea Litsch., and T. ferruginea (Pers. per Pers.: Fr.) Pat, are conspicuous because of a change in wall pigment or diffusate to blue or green when mounted in dilute aqueous KOH. The color change, in buffer solutions ranging from pH 2.6 to 12.6, was related to pH rather than being specific for KOH. The color was most intense at pH 10.0 and 10.7, virtually absent at pH 8.0, and absent at pH 6.8 and below. The color change was reversible.