GROUP OF s.BIGELOvII.Megaspores rugose оп the outer face... SUBGROUP OF S. ARENICOLA.Megaspores smooth or very nearly so о п the outer face a. Stems prostrate, rooting throughout.e sein мнр Minen НЕ Stems elongate, slender, branches remote.
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Alice F. Tyron (1949) studied this question.