Rhipidoglossum globulosocalcaratum (De Wild.) Summerh.

Macedo, Arthur, Trovó, Marcelo, Stévart, Tariq & Farminhão, João, 2025, A new species of Rhipidoglossum (Orchidaceae, Angraecinae) from the Western Rift Valley (Africa), Plant Ecology and Evolution 158 (2), pp. 248-259 : 248-259

Rhipidoglossum globulosocalcaratum (De Wild.) Summerh. ( Summerhayes 1937: 82)

Figs 1 , 2 , Table 1

Diaphananthe globulosocalcarata (De Wild.) Summerh. ( Summerhayes: 1960: 142)

Angraecum globulosocalcaratum De Wild. ( De Wildeman 1916: 186)

Type

DEMOCRATIC REPUBLIC OF THE CONGO – Bas-Uele Province • Buta, [route] Zobia – Buta ; 12 May 1907; fl.; F. Seret 871; lectotype (designated here): BR [ BR 0000008810670 ]; isolectotypes: BM [ BM 000539994 ], K [ K 000306286 ], P [ P 00388674 ] .

Notes

Two gatherings are cited in the protologue of R. globulosocalcaratum : Seret 871 and Seret 582. The latter is an unicate associated with Angraecum globulosocalcaratum var. angustifolium , considered here as a nomen nudum due to the absence of a description or diagnosis, following Art. 38.1 of the Shenzen Code ( Turland et al. 2018). Szlachetko et al. (2021) cited Seret 871 in BR as the lectotype. However, they did not include the expression “ here designated ” or similar, so this attempt of lectotypification is ineffective according to Art. 7.11 of the Shenzen Code ( Turland et al. 2018). As there are duplicates of Seret 871 at BM, K, and P, we recognise the need to indicate a lectotype according to Art. 9.3 ( Turland et al. 2018). The specimen kept at BR (BR 0000008810670), where Émile De Wildeman was based, is here selected as the lectotype (Suppl. material 2), and includes line drawings by Hélène Durand, which were used for the species description. Another specimen, by Seret with no field collector number (BR 0000008810663) nor original annotations by De Wildeman, was found in the same type folder of R. globulosocalcaratum , but the collection year (1906) is in conflict with Seret 871, and thus cannot be confidently regarded as belonging to the type gathering.

Distribution

Cameroon, Equatorial Guinea ( Rio Muni), Democratic Republic of the Congo, and Uganda. Cameroon and Uganda represent new country records. All known occurrences from Rwanda correspond to R. fischerianum . The occurrence of R. globulosocalcaratum at Irangi, DRC ( Biedinger and Fischer 1996) must be confirmed (Fig. 1 ).

Additional specimens examined

CAMEROON – Central Province • Mbam-et-Kim, Parc National du Mbam et Djérem, à 6, 6 km de Myéré ; 753 m; 2 Jun. 2011; fl.; Yaoundé shadehouse series 2837; BRLU spirit . – Southwest Province • Koupé-Manengouba, Crète NW Muetan Aku, 9 km SW Bangem ; 2 Jun. 1982; fl.; J. F. Villiers 1404; P [ P 00383748 ], YA [ YA 47310 ] . – Eastern Province • Lom-et-Djérem, Parc National de Deng Deng ; 708 m; 4 Jun. 2015; fl.; Yaoundé shadehouse series 6102; BRLU spirit .

EQUATORIAL GUINEA (RIO MUNI) – South-Centre Province • Bicurga ; 680 m; 22 May 2002; fl.; T. Stévart 1514; BRLU spirit • Bicurga ; 643 m; s. d.; fl.; T. Stévart 285; BRLU spirit • Bicurga ; 623 m; 12 Jul. 2001; fl.; T. Stévart 956; BRLU spirit • Bicurga ; 730 m; 20 May 2002; fl.; I. Parmentier & P. Esono 3189; BRLU spirit .

DEMOCRATIC REPUBLIC OF THE CONGO – Ituri • Mambasa, Village Magbagba ; 22 May 1906; fl.; F. Seret 582; BR [ BR 0000006800758 ] . – Without locality • 1906; F. Seret s. n.; BR [ BR 0000008810663 ] .

UGANDA – Western Region • Buliisa, Budongo Forest ; s. d.; fl.; C. L. A Leakey 33027; K spirit [Spirit: 33027.000] • ibid.; 1010 m; Feb. 1996; st.; D. L. N. Hafashimana 0024; K .

Figures

Figure 1. Distribution map of Rhipidoglossum globulosocalcaratum, R. fischerianum, and R. adoxum in continental Tropical Africa. The question mark indicates the location of Irangi (Democratic Republic of the Congo), a point occurrence of R. globulosocalcaratum (Biedinger and Fischer 1996) yet to be confirmed.

Figure 2. Rhipidoglossum globulosocalcaratum. A. Habit. B. Inflorescences with buds and flowers. C. Inflorescence with open flowers in frontal view. D. Flowers (lateral view). E. Fruits. Photographss by Vincent Droissart (Cameroon, Yaoundé shadehouse series YA 6102, BRLU).