HOFMANN, Laurie C., Jeremy C. NETTLETON, Christopher D. NEEFUS, & Arthur C. MATHIESON 2010 (Aug 01) Cryptic diversity of Ulva (Ulvales, Chlorophyta) in the Great Bay Estuarine System (Atlantic USA): introduced and indigenous distromatic species Eur. J. Phycol. 45(3): 230-239, 9 figs., 4 tables Ulva lactuca, U. pertusa, U. compressa, U. rigida |