Hymenophyllum axsmithii

Fossil species of fern

Hymenophyllum axsmithii is an extinct species of fern in the family Hymenophyllaceae related to the modern hayscented ferns. The species is known from fossil fronds found in early Eocene sites of northern Washington state, United States and central British Columbia, Canada. The species is included in Hymenophyllum subgenus Sphaerocionium, with a suggested to be closest to a group of tropical species in the subgenus that are all specialized as sheltered epiphytes.

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