Ikabanga, D.U., K.G. Koffi, J.M. Onana, B. M'Batchi, O.J. Hardy & T. Stévart (2019). Taxonomic revision of Santiria (Burseraceae) in Tropical Africa. Candollea 74: 115–130. In French, English and French abstracts. DOI: http://dx.doi.org/10.15553/c2019v742a1

In Tropical Africa, the genus Santiria Blume (Burseraceae) was considered as having one species, Santiria trimera (Oliv.) H.J. Lam ex Aubrév. The recent studies combining morphometric and molecular analysis revealed four isolated genetic groups that can be distinguished with clear morphological features. Following this study, a taxonomic revision of Santiria is conducted in tropical Africa, including the islands of the Gulf of Guinea. Four species are recognized: in addition to Santiria trimera, taxa previously described as Santiria balsamifera Oliv., Santiria ebo (Pierre) H.J. Lam and Santiria obovata (Pierre) H.J. Lam are re-established. Morphological distinctive traits that differentiate the four species are abundance of the elemi, presence/absence of lenticels on the twigs, pubescence of the inflorescence, and immature fruit color. A taxonomic key is provided. Three neotypes and two lectotypes are designated (including synonyms). Each species is described, affinities with other taxa, uses, field pictures and a preliminary conservation status according to the IUCN Categories and Criteria are provided.

Ranarivelo, H. & F. Almeda (2019). A new Dichaetanthera (Melastomataceae: Melastomateae) from Masoala National Park in Madagascar. Candollea 74: 131–136. In English, English and French abstracts. DOI: http://dx.doi.org/10.15553/c2019v742a2

Dichaetanthera schatzii H. Ranariv. & Almeda, a new species from Masoala National Park in northeastern Madagascar, is described, illustrated, and compared with Dichaetanthera arborea Baker, its presumed closest relative. Dichaetanthera schatzii appears to be endemic to the lowland humid evergreen forest on the southwestern side of Masoala National Park in Madagascar.

Butaud, J.F., F. Jacq & M.W. Callmander (2019). Pandanus papateaensis (Pandanaceae): a new threatened species from the uplifted atoll Makatea (Tuamotu, French Polynesia). Candollea 74: 137–144. In French, English and French abstracts. DOI: http://dx.doi.org/10.15553/c2019v742a3

The new species Pandanus papateaensis Butaud, F. Jacq & Callm. (Pandanaceae) is described from the uplifted atoll of Makatea located in the Tuamotu Archipelago of French Polynesia. The new species can be distinguished from other Polynesian species by its completely fused drupes with usually two seminal chambers and by its reddish-brown to dark-purple pileus, which totals more than one third of the total length of the drupe. Pandanus papateaensis is known from a few subpopulations located on the edge of the central plateau and it occurs in sympatry with Pandanus tectorius Parkinson. The species is known by less than 80 individuals and its sustainability is threatened by a phosphate mining project, which could have a significant impact on two of the three subpopulations. Based on the latter evidence, the new species is assigned a preliminary “Endangered” [EN] status following IUCN Red list Categories and Criteria. A regulatory protection status is thus recommended for this new species, as well as for the exceptional natural vegetation formations of this atoll, which is threatened by 50 years of intense phosphate mining without any current restoration programs to compensate for the damage caused.

Lebrun, J.-P. & A.L. Stork (2019). New combinations in Cyperaceae for continental Africa. In English, English abstract. Candollea 74: 145–151. DOI: http://dx.doi.org/10.15553/c2019v742a4

The generic concept adopted in our forthcoming volume of the family Cyperaceae for the Tropical African Flowering Plants series requires some new combinations in Cyperaceae. Our compilation of Cyperaceae is a compromise between traditional and the most recent treatments as regards Cyperus. We therefore propose 18 new combinations and a replacement name for taxa first described in Cyperus L. transferred to the genera Kyllinga Vahl, Mariscus Rottb. and Pycreus P. Beauv.: Kyllinga brunneofibrosa (Lye) J.-P. Lebrun & Stork, Kyllinga inselbergensis (Lye) J.-P. Lebrun & Stork, Kyllinga microcristata (Lye) J.-P. Lebrun & Stork, Kyllinga rheophytica (Lye) J.-P. Lebrun & Stork, Mariscus absconditicoronatus (Bauters, Reynders & Goetgh.) J.-P. Lebrun & Stork, Mariscus baobab (Lye) J.-P. Lebrun & Stork, Mariscus baoulensis (Kük.) Hutch. ex J.-P. Lebrun & Stork, Mariscus boreochrysocephalus (Lye) J.-P. Lebrun & Stork, Mariscus cundudoensis (Chiov.) J.-P. Lebrun & Stork, Mariscus gypsophilus (Lye) J.-P. Lebrun & Stork, Mariscus kitaleensis J.-P. Lebrun & Stork, Mariscus micromedusaeus (Lye) J.-P. Lebrun & Stork, Mariscus ossicaulis (Lye) J.-P. Lebrun & Stork, Mariscus pluricephalus (Lye) J.-P. Lebrun & Stork, Mariscus recurvispicatus (Lye) J.-P. Lebrun & Stork, Mariscus somalidunensis (Lye) J.-P. Lebrun & Stork, Mariscus soyauxii subsp. pallescens (Lye) J.-P. Lebrun & Stork, Mariscus unispicatus (Bauters, Reynders & Goetgh.) J.-P. Lebrun & Stork, and Pycreus micropelophilus (Lye) J.-P. Lebrun & Stork.

Received: June 24, 2019. Accepted: July 22, 2019. First published online: August 19, 2019.

Reeb, C., R. Letsara, R.L. Andriamiarisoa, J.C. Brinda, G.-A. Abalo-Loko, E. Boucheron-Dubuisson, E. Fischer, N.G. Hodgetts, E. Lavocat-Bernard, F. Naniarimino, P.B. Phillipson, A. Sass-Gyarmati & A. Vanderpoorten (2019). A pilot workshop on Bryophytes at the Antananarivo Herbarium (TAN) revealed the presence of seven additional species for Madagascar. Candollea 74: 153–158. In English, English and French abstracts.

We present a contribution to the knowledge of the Malagasy bryoflora that results from a BRYOTAN workshop organized in September 2018 at the Antananarivo Herbarium (TAN) housed at the Parc Botanique et Zoologique de Tsimbazaza, Antananarivo, Madagascar, within the framework of the BRYOTAN project (Bryophytes of TAN). Seven taxa reported here as new for Madagascar were found among the specimens stored in TAN. These findings illustrate the interest of this sort of initiative, the potential richness of the unstudied material in herbaria, and the necessity of exploring regions that are bryologically poorly known within Madagascar.

Castillon, J.-P. & J.-B. Castillon (2019). Taxonomic and nomenclatural novelties in the genus Euphorbia (Euphorbiaceae) in Madagascar. Candollea 74: 159–167. In French, English and French abstracts.

The identity of Euphorbia neobosseri Rauh is clarified. A new combination Euphorbia mahafalensis var. itampolensis (Rauh) J.-P. Castillon & J.-B. Castillon is proposed. Euphorbia rubrostriata Drake is decribed in detail and neotypified. The origin and typification of Euphorbia annamarieae Rauh is discussed. Lectotypes are designed for: Euphorbia annamarieae Rauh, Euphorbia erythroxyloides Baker, and Euphorbia mangorensis Leandri. Five new synonymies are proposed.

Bidault, E. & W.J. van der Burg (2019). Novitates Gabonenses 90: Palisota (Commelinaceae) revisited: description of eight new species from Central Africa and notes on the identity of P. satabiei and P. bogneri. In English, English and French abstracts. Candollea 74: 169–202.

A review of the taxonomy of Palisota Rchb. ex Endl. (Commelinaceae) in Atlantic Central Africa, as a precursor to preparing a treatment of Commelinaceae for the Flore du Gabon, results in the description of eight new species: Palisota akouangoui E. Bidault & Burg, Palisota alboanthera Burg & E. Bidault, Palisota cristalensis E. Bidault & Burg, Palisota fadenii Burg & E. Bidault, Palisota leewhitei Burg, O. Lachenaud & E. Bidault, Palisota plicata E. Bidault & Burg, Palisota repens E.Bidault & Burg, and Palisota stevartii Burg & E. Bidault. A discussion is provided on the relevance of several morphological characters and on the taxonomy and delimitation of two poorly known species, Palisota bogneri Brenan and Palisota satabiei Brenan. The new species are described and illustrated with line drawings and field photographs, accompanied by a distribution map. A key to the Palisota species in Atlantic Central Africa is provided. Preliminary risk of extinction assessments indicate that three of them are “Endangered”, three are “Vulnerable”, one is “Near Threatened”, and one species is “Least Concern”. Thirty-two species are currently recognized in Palisota, nineteen of which occur in Gabon.

Strid, D., J. Kearey & S.G. Razafimandimbison (2019). Schismatoclada spathulata (Rubiaceae), a new species from the Marojejy National Park (northeastern Madagascar). In English, English & French abstracts. Candollea 74: 203–208.

A new species Schismatoclada spathulata D. Strid & Razafim. (Rubiaceae) from the Marojejy National Park in northeastern Madagascar is described and illustrated. The new species differs from the other Schismatoclada Baker species by the combination of spathulate leaves and ellipsoid seeds that are bilaterally flattened and broadly winged all around. It is known only from the Beondrika Massif of the Marojejy National Park, and has not been seen below 1200 m altitude. It is assigned a preliminary conservation status of “Least Concern” following IUCN Red List, as no sign of degradation of its habitat has been observed.

Bungener, P. & D. Jeanmonod (2019). The Brothers Soleirol, a centuries-long history of a confusion on a collector in Corsica. Candollea 74: 209–216. In French, English & French abstracts.

Soleirol is a famous botanical collector well known for his plant collections in Corsica in the 1820's. Many scientific names of taxa have been dedicated to him. Although his herbarium specimens and letters have been signed by his surname alone and without his first name, the botanical tradition has given him the surname of Joseph-François (1781–1863). Our investigation shows that this botanist is in fact Henri-Augustin (1792–1860), the younger brother of Joseph-François. That conclusion is drawn on the analysis of his herbarium specimens, botanical literature, correspondence and biographical accounts. The Brothers Soleirol have followed a similar career in the French Army and had the same interests for art and botany. These similar ways of life have subsequently caused the confusion of their surnames. Our research shows that Henry-Augustin was the only one who collected plants in Corsica between 1820 and 1823 and visited about sixty localities from Cap Corse to Bonifacio through the large mountain ranges. As an important plant collector for Corsica, Soleirol has collected more than 5000 specimens that he has distributed or exchanged with other botanists. This paper highlights the activity of an amateur botanist at the beginning of the XIX^th century. It honors Henry Augustin for his work after more than one century of confusion with his brother.

MOSYAKIN, S.L., N.M. SHIYAN & I. HODÁLOVÁ (2019). Lectotypification of Senecio praealtus var. borysthenicus (Asteraceae). In English, English abstract. Candollea 74: 217–221.

Senecio praealtus var. borysthenicus DC. (Asteraceae) was described based on specimens from Ukraine provided by Wilibald S.J.G. von Besser (1784–1842) and annotated by Antoni L. Andrzejowski (1785–1868) as “Senecio borysthenicus”. This taxon was previously recognized as Senecio borysthenicus (DC.) Andrz. ex Czern. and is currently accepted as Jacobaea borysthenica (DC.) B. Nord. & Greuter. A lectotype is designated for this name based on a specimen collected near the village of Kyslyakivka, Kherson Governorate (now Lymany, Mykolayiv Region, Ukraine), one of three original specimens studied by Augustin-Pyramus de Candolle (1778–1841) and deposited in G-DC. The authorship of Senecio borysthenicus and Senecio jacobaea var. borysthenicus is also discussed.

Received: March 24, 2019; Accepted: October 22, 2019; First published online: December 2, 2019

CALLMANDER, M.W., J. MAZUMDAR & C.E. JARVIS (2019). Typification and nomenclature of the western Indian Ocean islands ferns and lycophytes described in Linnaeus filius's Supplementum plantarum. Candollea 74: 223–234. In English, English abstract.

Carl Linnaeus filius (1741–1783) published 16 new species names of ferns and lycophytes in Supplementum plantarum in 1782. Nine of these new taxa originated from the western Indian Ocean islands and were based on collections cited as “Sonnerat per Thouin” or “Thouin” in their protologues. Correspondence between André Thouin (1747–1824) and the younger Linnaeus indicates that those new names were based on a set of 50 collections that Thouin shipped to Linnaeus f. in 1779 and were in reality collected by Philibert Commerson (1727–1773) and not Pierre Sonnerat (1748–1814). Original material has been located in Linnaeus filius's herbarium (now in LINN-HS) and duplicates have been located in the Thouin herbarium (now MPU) and in G, P, P-LA and SBT. We formally designate lectotypes for five fern and two lycophyte names described by the younger Linnaeus in Supplementum plantarum: Acrostichum punctatum L. f., Acrostichum viviparum L. f., Adiantum furcatum L. f., Adiantum repens L. f., Lycopodium gnidioides L. f., Lycopodium verticillatum L. f., and Polypodium pica L. f. A lectotype is additionally designated for Asplenium daucifolium Lam., the currently accepted name for Acrostichum viviparum.

Received: June 13, 2019; Accepted: November 18, 2019; First published online: December 2, 2019