Template:Sym & Pienaar, 1991
- Sym, S.D. & Pienaar, R.N. 1991. Light and electron microscopy of a punctate species of Pyramimonas, P. mucifera sp. nov. (Prasinophyceae). Journal of Phycology 27(2): 277–290. DOI: 10.1111/j.0022-3646.1991.00277.x
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