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Support the Flora of the Southeastern US

2024 has been a banner year for making the best flora we can imagine. We've created:
With financial support from people like you, we are aiming even higher in 2025. Together we can accomplish all this: Vote on our 2025 priorities
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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key A1: pteridophytes reduced to thalloid or filamentous, free-living gametophytes

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1 Gametophytes filamentous in part or in whole, forming felt-like mats.
  2 Gametophytes strictly filamentous; [inland physiographic provinces, on ceilings and back walls of rock grottos]
  2 Gametophytes filamentous and also bearing flattened blades tipped by gemmae; [rotting wood in the Coastal Plain]
1 Gametophytes thalloid, ribbon-like and branched.
    3 Gemmae absent or spatulate (the gemma > 1 cell wide)
    3 Gemmae with cells uniseriate (the gemma 1 cell wide)