An integrative taxonomic study of the genus Lethocolea (Marchantiophyta: Acrobolbaceae) Author Gradstein, S. Robbert 0000-0002-3849-6457 Meise Botanic Garden, Meise, Belgium Author Ilkiu-Borges, Anna Luiza 0000-0002-1266-7211 Museu Paraense Emílio Goeldi, Coordenação de Botânica, Belém, Brazil Author Cargill, D. Christine 0000-0001-8390-3245 Australian National Herbarium, Centre for Australian National Biodiversity Research, Canberra, Australia Author Beckmann, Karen P. O. Box 353, Monbulk, Victoria, Australia Author Vanderpoorten, Alain 0000-0002-5918-7709 Institute of Botany, University of Liège, Liège, Belgium text Plant Ecology and Evolution 2024 2024-10-09 157 3 375 398 journal article 10.5091/plecevo.126936 II. Lethocolea subgen. Symphyomitra (Spruce) Grolle ( Grolle 1972: 549 ) Symphyomitra Spruce ( Spruce 1885: 503 ). Neoprasanthus S. Winkl. ( Winkler 1969: 69 ) – Type species: Neoprasanthus granatensis S. Winkl. (= Lethocolea congesta (Lehm.) S. W. Arnell ). Lethocolea sect. Pachycolea R. M. Schust. ( Schuster 2021: 531 ) – Type species: Lethocolea glossophylla (Spruce) Grolle (= L. congesta (Lehm.) S. W. Arnell ). Type species. Symphyomitra glossophylla Spruce (= L. congesta (Lehm.) S. W. Arnell ). Description. Stems ventral surface green to brownish-green, stolons present or absent. Leaf cells with a densely papillose cuticle; oil bodies 1–3 per cell (usually 2), dark brown, often persistent in plants with distinct trigones (Fig. 3 G, H ), ellipsoid to fusiform, 8–10 × 15–25 µm, brown, finely papillose, pupils (“ eye spots ”) absent. Antheridia 1 (– 6) per bract. Marsupia short-cylindrical, up to 3 mm long, wall 5–6 cells thick, marsupial canal lined by few papilliform cells ( Grolle 1972 ). Capsules splitting to the base into 2–4 valves, with two adjacent valves sometimes remaining partially connate. Asexual reproduction by disciform gemmae absent. Distribution. One species in Africa, Central and South America, and on the south Atlantic Islands.