Phytotaxa 270 (1): 056–062 http://www.mapress.com/j/pt/ Copyright © 2016 Magnolia Press ISSN 1179-3155 (print edition) Article PHYTOTAXA ISSN 1179-3163 (online edition) http://dx.doi.org/10.11646/phytotaxa.270.1.6 Nomenclatural notes in the Pleurothallidinae (Orchidaceae): Phloeophila GUY R. CHIRON1, ADAM P. KARREMANS2,3 & CASSIO VAN DEN BERG4 1 Herbiers, Université de Lyon I, F-69622 Villeurbanne Cedex, France; E-mail: g.r.chiron@wanadoo.fr Lankester Botanical Garden, University of Costa Rica, P.O. Box 302-7050 Cartago, Costa Rica 3 Naturalis Biodiversity Center, Leiden, The Netherlands 4 Universidade Estadual de Feira de Santana, Departamamento de Ciências Biológicas, Av. Transnordestina s.n., 44036-900, Feira de Santana, Brazil 2 Abstract Two of us found some years ago that Phloeophila nummularia, type species of the genus Phloeophila, was placed in a molecular phylogentic study in Pabstiella. In this article, we show with the inclusion of new sequences of Phloeophila that this result was not correct. Phloeophila forms a unique clade in Pleurothallidinae and is not closely related to Pabstiella. In addition, the exclusion of three species, one transferred to Dryadella and two others to Acianthera, is proposed. Key words: Brazilian Pleurothallidinae, Pabstiella, Phloeophila nummularia, phylogenetics of Pleurothallidinae Phloeophila Hoehne & Schlechter (1926: 199), previously (Luer 1986) placed in synonymy of Pleurothallis Brown (1813: 211), was re-instated by Pridgeon & Chase (2001) and Pridgeon (2005). In their molecular phylogenetic analysis of Pleurothallidinae, Pridgeon et al. (2001) showed that Phloeophila peperomioides (Ames 1923: 64) Garay (1974: 118) and a few other species formed a distinct clade. Nevertheless, Chiron et al. (2012) in a molecular phylogeny of Brazilian Pleurothallidinae found that two accessions labeled as Phloeophila nummularia (Reichenbach 1865: 276) Garay (1974: 118) were embedded in Pabstiella Brieger & Senghas (1976: 195). Because P. nummularia is the type species of Phloeophila, the authors considered both genera synonymous. In order to avoid having to transfer over one hundred names from Pabstiella to Phloeophila, Chiron & van den Berg (2013) proposed conserving the generic name Pabstiella against the older Phloeophila. At that time, one of us (AK) had obtained (but not yet published) ITS sequences of Brazilian and Cuban material of Phloeophila nummularia. Analysis of this material produced different results: the samples were placed in the Phloeophila clade, not in Pabstiella (Karremans et al. in press). Therefore, one of the samples labeled P. nummularia in Chiron et al. (2012) was re-extracted and sequenced. The new sequences confirmed the position of P. nummularia within the Phloeophila clade, proving once and for all that the previously used samples must represent some type of mistake in the laboratory. Therefore, we here present an emended phylogenetic analysis of Phloeophila, using the same data set as in Chiron et al. (2012) complemented with a few additional species of Phloeophila. Material and Methods We added and manually aligned ten (five Phloeophila species and five Pabstiella) additional sequences (Table 1) of the internal transcribed spacer (ITS) of the nuclear ribosomal DNA to the matrix used by Chiron et al. (2012) using the same methods as in that paper. Phylogenetic analysis was carried out using Bayesian inference in MRBAYES 3.2.6 (Ronquist et al. 2012). The data were partitioned into ITS1 and ITS2, whereas coding 18S, 5.8S and 26S were excluded because they contained no variation. Both partitions were modeled using GTR+I+G with unlinked parameters. The runs consisted of 2 runs of 4 chains of MCMC with the default temperatures for 10 million generations, sampling every 1,000 trees. The topology and posterior probabilities for nodes are shown in Fig. 1, which was prepared with FigTree 1.4.2. The tree was graphically simplified by collapsing large generic clades not relevant for Phloeophila/Pabstiella and manually annotating the number of terminals. 56 Accepted by Mark Chase: 25 Jul. 2016; published: 12 Aug. 2016 TABLE 1. Accession numbers and vouchers from sequences new to this study. Other accessions are availabe in Pridgeon et al. (2001) and Chiron et al. (2012). Taxon Voucher collector and number ITS Source Pabstiella sp. Chiron 13241 LT574822 Pabstiella sp. Chiron 13131 LT574823 Pabstiella sp. Chiron 14017 LT574824 Pabstiella ribeironensis Chiron & Xim.Bols. Chiron 13095 LT574825 Pabstiella ruschii (Hoehne) Luer Chiron 12091 LT574826 Phloeophila nummularia (Rchb. f.) Garay (1) Karremans 5959 KF747839 Karremans unp. Phloeophila nummularia (2) Stenzel 896 KC425841 Stenzel 2004 Phloeophila nummularia (3) Tesch sn LT574821 Phloeophila pelecaniceps (Luer) Pridgeon & M.W. Chase Chase 1128 AF262810 Pridgeon et al. 2001 Phloeophila peperomioides (Ames) Garay (1) None (see paper) AF275690 Pridgeon et al. 2001 Phloeophila peperomioides (2) Bogarín 7112 KC425745 Karremans in press Phloeophila pleurothallopsis (Kraenzl.) Pridgeon & M.W. Chase (1) Chase 978 AF262812 Pridgeon et al. 2001 Phloeophila pleurothallopsis (2) Karremans 4818 KC425746 Karremans unpubl. Phloeophila pleurothallopsis (3) Karremans 4856 KC425747 Karremans unpubl. Results The general phylogenetic relationships found for Pleurothallidinae (Fig. 1,2) are comparable to those obtained by Chiron et al. (2012). All Phloeophila accessions, with the exception of those from the original study (Chiron et al. 2012), form a strongly supported Phloeophila clade (PP=1; Fig. 1). The three independently extracted and sequenced accessions of Phloeophila nummularia form a highly supported cluster (PP=1). The two obtained from plants of Brazilian origin being almost identical to each other (Karremans 5959 and Tesch sn), whereas a third accession obtained by Stenzel (2004) from Cuban material is sister to these and has some variation in sequence. Taxonomic treatment Phloeophila Hoehne & Schltr. (1926: 201) Synonyms: Luerella Braas (1979: 108), Ophidion Luer (1982: 79). Phloeophila originally included only three species (Hoehne & Schlechter 1926), whereas four species were considered to belong in the genus by Luer (2006). Here, we adhere to the broad circumscription of Phloeophila that accounts for about a dozen species and includes the genera Luerella and Ophidion (Pridgeon 2005). We slightly modify that circumscription to exclude a few species that belong elsewhere. In that sense, Phloeophila includes nine species distributed from Belize through Central America and the Antilles to Bolivia and Brazil. The highest diversity is found in the Andes of Colombia and Ecuador. Phloephila carrilloi (Ortiz) Pfahl (2014: 1) Basionym: Ophidion carrilloi Ortiz (2005: 6). PHLOEOPHILA Phytotaxa 270 (1) © 2016 Magnolia Press • 57 FIGURE 1. First part of the tree obtained in a Bayesian analysis of 335 internal transcribed spacer (ITS) sequences of Pleurothallidinae. Numbers on the nodes represent posterior probabilities (PP), triangles represent large clades that were collapsed. The number of terminals in these clades are presented in brackets after the genus name. Taxa in Pabstiella and Pholeophila were not collapsed because they are the focus of this study. 58 • Phytotaxa 270 (1) © 2016 Magnolia Press CHIRON ET AL. FIGURE 2. Second part of the tree obtained in a Bayesian analysis of 335 internal transcribed spacer (ITS) sequences of Pleurothallidinae. Numbers on the nodes represent posterior probabilities (PP), triangles represent large clades that were collapsed. The number of terminals in these clades are presented in brackets after the genus name. Taxa in Pabstiella and Pholeophila were not collapsed because they are the focus of this study. PHLOEOPHILA Phytotaxa 270 (1) © 2016 Magnolia Press • 59 Phloeophila cunabula (Luer & R.Escobar) Pridgeon & Chase (2001: 254) Basionym: Cryptophoranthus cunabulus Luer & Escobar (1981: 114). Phloeophila cymbula (Luer) Pridgeon & Chase (2001: 254) Basionym: Cryptophoranthus cymbulus Luer (1980: 346). Phloeophila dasyglossa (Luer & R.Escobar) Pridgeon & Chase (2001: 254) Basionym: Cryptophoranthus dasyglossus Luer & Escobar (1981: 116). Phloeophila nummularia (Rchb.f.) Garay Basionym: Pleurothallis nummularia Reichenbach (1865: 276). Phloeophila pelecaniceps (Luer) Pridgeon & Chase (2001: 254) Basionym: Masdevallia pelecaniceps Luer (1976: 22). Phloeophila peperomioides (Ames) Garay Basionym: Pleurothallis peperomioides Ames (1923: 64). Phloeophila pleurothallopsis (Kraenzl.) Pridgeon & Chase (2001: 254) Basionym: Cryptophoranthus pleurothallopsis Kraenzlin (1925: 115). Phloeophila ursula (Luer & Hirtz) Luer (2006: 194) Basionym: Pleurothallis ursula Luer & Hirtz (1996: 193). Excluded taxa: Phloeophila oricola (H.Stenzel) Luer (2006: 193) = Acianthera oricola (H.Stenzel) Karremans, Chiron & van den Berg, comb. nov. Basionym: Pleurothallis oricola Stenzel (2002: 101). Pleurothallis oricola was placed in Phloeophila in Luer’s monograph of that genus. Nevertheless, the free dorsal sepal, narrowly obovate petals and prominently trilobed lip and verrucose-papillose above the middle are more similar to some species of Acianthera from the Antilles than to Phloeophila. Stenzel (2007) suspected such a relationship too. Phloeophila similis (Schltr.) Garay (1974 : 118) = Acianthera similis (Schltr.) Karremans, Chiron & van den Berg, comb. nov. Basionym: Cryptophoranthus similis Schlechter (1919: 323). Cryptophoranthus similis was placed by Luer in Pleurothallis sect. Phloeophilae Luer (1986: 17) together with other species that would later be recognized as belonging to genus Phloeophila. Nevertheless, Schlechter (1919) clearly described the sepals as “apice cohaerentibus” and the lip as “brevissime auriculato”, both features of species belonging to Acianthera sect. Cryptophoranthae (Luer) Chiron & van den Berg (2012: 68) rather than Phloeophila. Luer (2006) in fact excluded P. similis from his monograph of Phloeophila. Phloeophila yupanki (Luer & R.Vásquez) Pridgeon & Chase (2001: 254) = Dryadella yupanki (Luer & R.Vásquez) Karremans, comb. nov. Basionym: Pleurothallis yupanki Luer & Vásquez in Luer (1984: 203). Pleurothallis yupanki, as the previous, was also member of Pleurothallis sect. Phloeophilae and was therefore transferred to Phloeophila by Pridgeon and Chase (2001). It was later segregated into the monotypic genus Incaea Luer (2006: 87) due to its aberrant morphology. Nevertheless, DNA results (Karremans et al., in press) place it embedded within Dryadella Luer (1978: 207), which it resembles morphologically. 60 • Phytotaxa 270 (1) © 2016 Magnolia Press CHIRON ET AL. Conclusion Phloeophila nummularia, type species of the genus Phloeophila, is not situated in Pabstiella as suggested by Chiron et al. (2012), and two of us (GC and CvdB) have to apologize for our original mistake. The proposal to conserve Pabstiella vs. Phloeophila by Chiron and van den Berg (2013) should therefore also be considered unnecessary. Phloeophila nummularia is a variable species in its wide distribution from Cuba to Bolivia and Brazil. It is sister to the also morphologically similar P. peperomioides. 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