Black, M., Downie, C., Ross, R. & Sarjeant, W.A.S., 1967. Chapter 2. Thallophyta - 2. In W.B. Harland, C.H. Holland, M.R. House, N.F. Hughes, A.B. Reynolds, M.J.S. Rudwick, G.E. Satterthwaite, L.B.H. Tarlo & E.C. Willey (eds.), Foss. Rec., Oct 1967: 181-210.
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