Hymenophyllum mildbraedii (Brause ex Brause & Hieron.) Alston (1944: 60)

Dubuisson, Jean-Yves & Hennequin, Sabine, 2021, Correction for the taxonomy of the African fern Hymenophyllum senterreanum as synonym of the newly validated Hymenophyllum mildbraedii (Hymenophyllaceae, Polypodiidae), Phytotaxa 522 (3), pp. 263-264 : 263

Hymenophyllum mildbraedii (Brause ex Brause & Hieron.) Alston (1944: 60)

Trichomanes mildbraedii Brause ex Brause & Hieron. (1915: 376, 377). ≡ Hymenophyllum kuhnii var. mildbraedii (Brause ex Brause & Hieron.) Schelpe (1976: 54) .

Type:— EQUATORIAL GUINEA. Annobon Island, « Gipfel der Santa Mina, Nebelwald , die grössere Art unförmliche Polster an Zweigen bildend, 650 m. ü. M.», October 1911, J. Mildbraed 6701 (holotype B, B 20 0105317 !; isotypes B, B 20 0105318 !; P, P00482605 ! ).

= Hymenophyllum senterreanum Dubuisson & Deblauwe in Dubuisson et al. (2016: 288, 289). Type:— CAMEROON. Province du Sud : Parc National de Campo-Ma’an, aux environs des villages d’Ebianemeyong et Nyabissan, 02°29.59’N, 010°20.84’E, 934 m, 12 February 2015, Droissart V., Couvreur T. & Kamdem N. 1836 (holotype BRLU, BRLU0000909!; isotypes YA; P, P02434677!; MO).

Distribution:— Hymenophyllum senterreanum was considered endemic to the coastal part of the Lower Guinea Domain of the Guineo-Congolian Region sensu White (1979), and at least restricted to Cameroon and continental Equatorial Guinea according to Dubuisson et al. (2016). Its presence in neighboring countries including islands of the Guinea Gulf was also suspected and suggested in the latter paper. Hymenophyllum mildbraedii was collected on Annobon island. Its occurrence on other islands of the Guinea Gulf (e.g. Bioko, Princípe and São Tomé) is thus strongly expected, as well as its presence in local collections either as unidentified specimens or under the names H. kuhnii or H. polyanthos (Sw.) Sw. ( Swartz 1800: 102) . Investigations of the Paris collection allowed us to identify at least 13 additional specimens including two from Annobon (P01320810, P01320811) and three from Gabon (P01330128, P01330129, P01330130), a new locality, confirming a wider distribution as suggested in Dubuisson et al. (2016).