Cephalomanes atrovirens

Cephalomanes atrovirens is a species of fern in the family Hymenophyllaceae. The genus "Cephalomanes" is accepted in the Pteridophyte Phylogeny Group classification of 2016 (PPG I), but not by some other sources. , "Plants of the World Online" sank the genus into a broadly defined "Trichomanes", while treating the subtaxa of this species as the separate species Trichomanes acrosorum, Trichomanes atrovirens, Trichomanes boryanum and Trichomanes kingii.
Subtaxa.
Two subspecies and two forms have been recognized, all of which have been recognized as separate species in the genus "Trichomanes" by other sources:
Distribution.
The species as a whole is native to the Ryukyu Islands, Malesia (the Philippines and Sulawesi), Papuasia (New Guinea, the Bismarck Archipelago, and the Solomon Islands), the northwestern Pacific (the Mariana Islands, Palau, the Caroline Islands, and the Federated States of Micronesia), the southwestern Pacific (Fiji, New Caledonia, Samoa, Tonga, the Santa Cruz Islands, Vanuatu, and the Wallis and Futuna Islands) and eastern Australia (Queensland, New South Wales, Norfolk Island, and Lord Howe Island).
The two subspecies recognized by the "Checklist of Ferns and Lycophytes of the World" have distinct distributions. "C. atrovirens" subsp. "atrovirens" is native to the Ryukyu Islands, eastern tropical Asia (New Guinea, the Philippines, the Santa Cruz Islands, the Solomon Islands, Sulawesi, Vanuatu) and eastern Australia (Queensland, New South Wales, Norfolk Island and Lord Howe Island). "C. atrovirens" subsp. "boryanum" is found further east, being native to the Bismarck Archipelago and islands of the western Pacific (the Caroline Islands, Fiji, the Mariana Islands, New Caledonia, Samoa, Tonga, Vanuatu, and the Wallis and Futuna Islands).
The two forms have a narrower distribution. Both are found in New Guinea. "C. atrovirens" f. "acrosorum" is also native to Micronesia and the Solomon Islands, whereas "C. atrovirens" f. "acrosorum" is also native to the Santa Cruz Islands.