Abstract

SynopsisPerennial indendent gametophytes of Hymenophyllaceae, Vittariaceae and Grammitidaceae are a well-known phenomenon in the eastern United States. Their persistence is attributed to the ability of gametophytes of these fern families to reproduce themselves vegetatively via gemmae. This paper reviews the biology of independent gametophytes of these families as they exist in the eastern United States and presents new evidence from enzyme electrophoresis regarding their identity and origin.

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