Table 3. Differences in physiological reactions of S. quercinus, S. illinoinensis, and S. virginianus and their closest relatives^*.

Species	Rhammose	Galactitol	Lactate	Cadaverine	Glucosamine	Tryptophan	Melibiose	Inulin
S. insectosa	-	-	-	+	-	-	-	-
S. lignosus	-	+	w	+	-	-	-	-
S. quercinus	-	+,f	+	+	+	+	-	+
S. shehatae	-	-	-	+	-	-	-	-
S. virginianus	w	w	-	-	+	+	+	+
S. stipitis	+	-	+/−	+	-	-	-	-
S. illinoinensis	+	+/d	+/d	w	+	+	w	w

^*Biochemical assay results of previously described species were complied from Kurtzman (1990) and Barnett et al. (2000). Abbreviations for reaction results: +, positive; -, negative; d, delayed positive; w, weak positive.