Scytinostroma Galactinum Species Complex in the United States

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Abstract
Scytinostroma galactinum is a species complex and contains two inter-incompatible species with similar basidiocarp and cultural morphology. The two species can be distinguished by substrate and isozyme analysis. Scytinostroma galactinum occurs on woody gymnosperms and occasionally on angiosperms throughout North America. Scytinostromaprotrusum, comb, nov., is found on angiospermous wood. Two subspecies of S. protrusum are recognized based on physiological and distributional data. Scytinostroma protrusum subsp. septentrionale, subsp. nov., occurs primarily in the northern United States and is less tolerant of gallic acid than S. protrusum subsp. protrusum, which occurs in the southern United States. Basidiocarp and cultural descriptions of S. galactinum are provided. Scytinostroma protrusum is tetrapolar and multiallelic at the mating type locus.