Asplenium atlanticum (Aspleniaceae), a new endemic fern from the Brazilian Atlantic Forest Author Lino, Vanessa 0000-0002-3510-6580 Rio de Janeiro Botanical Garden Research Institute, National School of Tropical Botany, Postgraduate Program in Botany. Pacheco Leão Street 2040, Solar da Imperatriz, Postal code 22460 - 030, Rio de Janeiro, RJ, Brazil. & vanessalino @ jbrj. gov. br; https: // orcid. org / 0000 - 0002 - 3510 - 6580 vanessalino@jbrj.gov.br Author Reis, Atiles 0000-0002-2278-9669 Federal University of Rio de Janeiro, National Museum, Postgraduate Program in Botany. Quinta da Boa Vista, Postal code 20940 - 046, Rio de Janeiro, RJ, Brazil. & reisatiles @ gmail. com; https: // orcid. org / 0000 - 0002 - 2278 - 9669 reisatiles@gmail.com Author Sylvestre, Lana Da Silva 0000-0002-0486-0898 Federal University of Rio de Janeiro, Biology Institute, Department of Botany. Carlos Chagas Filho Avenue 373, Postal code 21941 - 902, Rio de Janeiro, RJ, Brazil. & lana @ biologia. ufrj. br; https: // orcid. org / 0000 - 0002 - 0486 - 0898 lana@biologia.ufrj.br Author Mynssen, Claudine Massi 0000-0002-1071-4707 Rio de Janeiro Botanical Garden Research Institute. Pacheco Leão Street 915, Postal code 22460 - 030, Rio de Janeiro, RJ, Brazil. & cmynssen @ gmail. com; https: // orcid. org / 0000 - 0002 - 1071 - 4707 cmynssen@gmail.com text Phytotaxa 2023 2023-07-17 603 1 81 88 http://dx.doi.org/10.11646/phytotaxa.603.1.6 journal article 55349 10.11646/phytotaxa.603.1.6 b14327e2-6c4b-4e7b-9432-891fc1237157 1179-3163 8153702

TABLE 1. Morphological comparison of Asplenium atlanticum, A. martianum, A. muellerianum, and A. pseudonitidum.

Species Characters	A. atlanticum	A. martianum	A. muellerianum	A. pseudonitidum
Petiole
Surface	dull	dull	dull	lustrous
Size (cm)	11–14.4(–16)	(21.4–)24–39.6	8–10(–21)	(18.2–)27–36.4
Laminae
Shape	deltoid to lanceolate	ovate-lanceolate to triangular	lanceolate	deltoid
Division	2-pinnate	2-pinnate to 3-pinnate	1-pinnate to 2-pinnate	2-pinnate
Margin	dentate	serrate-dentate to crenate or dentate	serrate to dentate	crenate to entire
Size (cm)	14–18(–21) × 4–5(–8)	26.7–43.6 × (6.5–)10.7– 14.7(–17.4)	25–32(–44) × 5–6.5(–12)	(18.5–)25–30.5 × 9–17.2
Pinnae
Shape	lanceolate	deltoid-lanceolate to lanceolate or oblong	deltoid to lanceolate	lanceolate
Size (cm)	3–4(–6.9) × 1–1.5	(4.8–)6–9.9 × (1–)1.3–2	2.3–5.2(–7.3) × 0.7–1.1	7–10 × 1.5–3
Apex	obtuse to acute	attenuate to attenuate- caudate or acute	attenuate to attenuate- caudate	acute
Pinnules
Shape	ovate	lanceolate to deltoid or oblong	ovate-orbiculate to oblong	oblong to lanceolate
Apex	obtuse	acute to obtuse	obtuse	obtuse to acute
Stem scales
Shape	linear-lanceolate and lanceolate	lanceolate	linear-lanceolate	lanceolate
Length (cm)	0.2–0.4(–0.5)	0.2–0.3	0.2–0.3	0.2–0.3(–0.5)
Base width (cm)	(0.02–)0.03–0.05(–0.06)	0.04–0.06	–	0.04–0.07
Sori
Shape	elliptic and linear	linear	linear	elliptic