Synoptic Revision of Diplazium (Athyriaceae) in Rwanda with description of Diplazium cyamudongoense sp. nov. Author Fischer, Eberhard 0000-0001-7455-9833 Institute for Integrated Natural Sciences-Biology, University of Koblenz, Universitätsstrasse 1, 56070 Koblenz, Germany. efischer @ uni-koblenz. de; https: // orcid. org / 0000 - 0001 - 7455 - 9833 efischer@uni-koblenz.de Author Lobin, Wolfram Botanical Gardens Bonn University, Meckenheimer Allee 171, D- 51115 Bonn, Germany. text Phytotaxa 2023 2023-06-26 600 3 169 183 http://dx.doi.org/10.11646/phytotaxa.600.3.4 journal article 54702 10.11646/phytotaxa.600.3.4 2a1cbd1e-993f-4c7c-b5ed-abe41c0fe91e 1179-3163 8080860 Diplazium zanzibaricum (Baker) Christensen (1905: 241) ( Figs. 8–10 ). Asplenium zanzibaricum Baker (1891: 311) . Deparia zanzibarica (Baker) Christenhusz (2018: 25) . Holotype : — TANZANIA . Mainland westward of Zanzibar , March 1885 , G.J. Last 261 (K000351065!). Specimens seen: — RWANDA . Northern Province: Volcano National Park, foot of Bisoke, 2800 m , 22 September 2021 , E.Fischer s.n . (KOBL); Sabinyo, ravin Rwebeya, 14 October 2009 , E.Fischer s.n . (KOBL); Sabinyo, 2750 m , 14 January 2017 , E.Fischer s.n . (KOBL); Gahinga, 2800 m , 20 March 2022 , E.Fischer, P.Ballings & B.Wursten s.n . (KOBL). Distribution in Rwanda : —Northern Province, Volcano National Park. Distribution in Africa: —D.R. Congo , Rwanda , Uganda , Kenya , Tanzania , Zambia , Malawi , Mozambique , Zimbabwe , Rep. South Africa . Habitat: —In Rwanda in montane forests with Dombeya , Hagenia -Hypericum Forest and bamboo forest from elev. 2750–3100 m , elsewhere in East Africa already at elev. 1450 m (fide Verdcourt 2003 ). First recorded for Rwanda : — Kornaś & Nowak (1991) on Mt. Bisoke. Note: —The species has been collected already by Mildbraed in 1907 in the Congolese part of the Volcanoes. The specimen Mildbraed 1324 (Ninagongo, oberer lichter Cornuswald, 2800 m ü. M., 4 October 1907 , B 20 0028984!) bears a handwriting by Hieronymus ( Athyrium mildbraedii sp. nov. ) and a description of the almost smooth spore (“Sporen ohne Kamm und anastomosierende Leisten” = spores without folds and anastomosing alae, pers. translation) ( Fig. 10 ). However, this new species was never published. In Brause & Hieronymus (1910: 7) there is a note that this species belongs to Athyrium (“Geĥrt nicht unter Diplazium , sondern zu Athyrium ” = “doesn’t belong to Diplazium , but to Athyrium ”, pers. translation). Christenhusz (2018: 25) placed the taxon in the genus Deparia ( Hooker & Greville 1829 : t. 154). Diplazium zanzibaricum has an East African distribution, while the West African specimens belong to D. velaminosum ( Pichi Sermolli 1973 ) .