A new species of grass fern, Schizaea erecta (Schizaeaceae), from Dinagat Island, Mindanao, Philippines Author Amoroso, Victor B. 0000-0001-8865-5551 Plant Biology Division, Institute of Biological Sciences, College of Arts and Sciences, Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & Center for Biodiversity Research and Extension in Mindanao (CEBREM), Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & victorbamoroso @ gmail. com; https: // orcid. org / 0000 - 0001 - 8865 - 5551 victorbamoroso@gmail.com Author Acola, Mescel S. 0009-0008-0003-0265 Center for Biodiversity Research and Extension in Mindanao (CEBREM), Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & mescelacola @ gmail. com; https: // orcid. org / 0009 - 0008 - 0003 - 0265 mescelacola@gmail.com Author Guiang, Maria Melanie M. 0000-0003-1584-1585 Plant Biology Division, Institute of Biological Sciences, College of Arts and Sciences, Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & Center for Biodiversity Research and Extension in Mindanao (CEBREM), Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & f. mariamelanie. guiang @ cmu. edu. ph; https: // orcid. org / 0000 - 0003 - 1584 - 1585 f.mariamelanie.guiang@cmu.edu.ph Author Acma, Florfe M. 0000-0002-0453-8575 Plant Biology Division, Institute of Biological Sciences, College of Arts and Sciences, Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & Center for Biodiversity Research and Extension in Mindanao (CEBREM), Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & flacma @ gmail. com; https: // orcid. org / 0000 - 0002 - 0453 - 8575 flacma@gmail.com Author Fritsch, Peter W. 0000-0002-3606-663X Botanical Research Institute of Texas, Fort Worth Botanic Garden, 1700 University Drive, Fort Worth, Texas 76107 - 3400, USA & pfritsch @ fwbg. org; https: // orcid. org / 0000 - 0002 - 3606 - 663 X pfritsch@fwbg.org Author Coritico, Fulgent P. 0000-0003-3876-6610 Plant Biology Division, Institute of Biological Sciences, College of Arts and Sciences, Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & Center for Biodiversity Research and Extension in Mindanao (CEBREM), Central Mindanao University, University Town, Musuan, Bukidnon 8710, Philippines & cfulgent @ cmu. edu. ph; https: // orcid. org / 0000 - 0003 - 3876 - 6610 cfulgent@cmu.edu.ph text Phytotaxa 2023 2023-10-04 618 3 265 273 http://dx.doi.org/10.11646/phytotaxa.618.3.4 journal article 10.11646/phytotaxa.618.3.4 1179-3163 8406837 Key to the genera and species of grass ferns ( Schizaeaceae ) in the Philippines 1. Sorophores pinnately arranged or comb-like ( Schizaea )....................................................................................................................2 -. Sorophores digitate ( Actinostachys ) ...................................................................................................................................................4 2. Fronds unbranched .............................................................................................................................................. Schizaea malaccana -. Fronds repeatedly dichotomously branched.......................................................................................................................................3 3. Laminae arching; segments ≥ 2 mm wide............................................................................................................ Schizaea dichotoma -. Laminae consistently erect; segments < 2 mm wide................................................................................................... Schizaea erecta 4. Laminae ≥ 2 mm wide; stipes indistinct.............................................................................................................................................5 -. Laminae < 2 mm wide; stipes distinct................................................................................................................................................6 5. Laminae (sterile portion) ≤ 5 mm wide; stomata in one row on each side of costa; sporangia in four rows on the sorophores ......... .......................................................................................................................................................................... Actinostachys digitata -. Laminae (sterile portion) ≤ 2.5 mm wide; stomata in two rows on each side of costa; sporangia in two rows on the sorophores ..... ....................................................................................................................................................................... Actinostachys inopinata 6. Epiphytic; sorophores < 6 mm long, 1 to 4 ....................................................................................................... Actinostachys minuta -. Terrestrial; sorophores ≥ 6 mm long, 1............................................................................................................. Actinostachys simplex