Studies have continued on the diversity of the Michigan bolete flora. During the season of 1972 a variety of Boletus affinis Peck having a reticulate stipe was discovered and abundant material of Boletus bicolor var. subreticulatus Smith & Thiers was obtained. Boletus hortonii Smith & Thiers was collected on two occasions and a detailed description was prepared. Boletus rubissimus sp. nov. is described. Specimens of Leccinum aurantiacum from France are reported upon, and color variants in Suillus are discussed. In Tylopilus amyloid reactions in T. sordidus are discussed and T. subfusipes is described as new.