The low-temperature hole-burning spectra of the triplet pi-pi* state of coronene in 1-bromobutane:ethyliodide 4:1 (v/v) and 5-bromoacenaphthene and 2-iodoquinoline in 1-bromobutane are reported. The coronene system is unique in showing distinct sideholes. The lack of sideholes in the other two systems is attributed to a noncorrelation of the zero-field splitting within the probed isoenergetic component of the inhomogeneous distribution. This aspect is further pursued by phosphorescence-line-narrowing experiments for the 2-iodoquinoline/1-bromobutane system in magnetic fields up to 0.83 T.