Former herbarium curator Dr. Robert Capers published the discovery of Apopellia endiviifolia for North America. A voucher is in the CONN herbarium.
Favreau M., L. L. Forrest, R. Capers & J. C. Villarreal A. 2025. Apopellia endiviifolia (Dicks.) Nebel & D.Quandt confirmed in North America. Evansia 42(2): 34. pdf.
Abstract reads: Specimens morphologically identified as the liverwort Apopellia endiviifolia have been collected in Quebec, Canada, for over 20 years. Their identity as this species is herein confirmed by DNA sequence data, and the species range is extended to the United States, in Maine and Vermont.