Abrodictyum inexpectatum Dubuisson & Bauret & Boucheron-Dubuisson & Rouhan 2022, sp. nov.

Abrodictyum inexpectatum Dubuisson & Rouhan, sp. nov., Fig. 3. Plants similar to Abrodictyum franceae Bauret & Dubuisson, but smaller on average and with fronds plane in the wild (vs. usually crispate or curled for A. franceae) and genetically different; also first supposedly close to A. angustimarginatum (Bonap.) J.P. Roux, but genetically different and displaying ultimate segments with more than three rows of cells on both sides of the terminal veins (vs. not more than three rows of cells for A. angustimarginatum). It also differs from A. dregei (Bosch) Dubuisson & Rouhan in mature fronds smaller in average, usually not exceeding 13.5 cm long (reaching 37 cm for A. dregei), lamina light green and translucent (vs. dark green and opaque), and sori obconic or cup-shaped (vs. cylindrical to slightly campanulate). Type:— MADAGASCAR. Antsiranana: Andapa, Parc national de Marojejy, abords du camp 4 et le long de la rivière, 14°26’43”S, 49°44’31”E, 25 September 2015, G . Rouhan, L. Bauret, & D. Ravelonarivo s.n. (holotype: P [P02434058]!) Epiphytic at the base of trunks or saxicolous ferns. Rhizomes short, erect, 0.5–1.0 cm in diameter, bearing long tufted, erect, red-brown and more or less catenate pluricellular hairs, densely covering apex, and numerous robust roots. Fronds clustered, semi-erect; stipes 1–3 cm long, wingless and slightly canaliculate on the adaxial surface bearing numerous scattered hairs identical to those of rhizomes; rachises, with wings on their upper part only, and main costae with hairs similar to those on the stipes and rhizomes. Laminae 5.5–10.5 × 1.5–3.5 cm, narrowly lanceolate with truncate base and acute apex, bipinnate-pinnatifid, light green and translucent, plane in the wild; pinnae 0.5–2.5 × 0.2–1.8 cm, lanceolate or ovate to narrowly oblong, sub-horizontal to oblique, basally sub-opposite then alternate; pinnules pinnatifid, lanceolate or ovate to linear, with lamina slightly decurrent along the second order costules; ultimate or terminal segments 0.2–0.4 mm wide ...