Key to the common species of Hypoglossum

1 Not all cells of 2nd order rows bear 3rd order rows H. simulans Wynne, Price, Ballantine
1 All cells of 2nd order rows bear 3rd order rows 2
2 Plants erect, blades occasionally with marginal rhizoids H. wynnei Abbott
2 Plants prostrate, repetitive blades fastened to substratum at bases and apices H. caloglossoides Wynne & Kraft

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