Darwiniana ISSN: 0011-6793 [email protected] Instituto de Botánica Darwinion Argentina Sá, Mariana C. A.; Wartchow, Felipe LACTIFLUUS AURANTIORUGOSUS (RUSSULACEAE), A NEW SPECIES FROM SOUTHERN BRAZIL Darwiniana, vol. 1, núm. 1, enero-junio, 2013, pp. 54-60 Instituto de Botánica Darwinion Buenos Aires, Argentina Available in: http://www.redalyc.org/articulo.oa?id=66928887003 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative DARWINIANA, nueva serie 1(1): 54-60. 2013 Versión final, efectivamente publicada el 31 de julio de 2013 ISSN 0011-6793 impresa - ISSN 1850-1699 en línea LACTIFLUUS AURANTIORUGOSUS (RUSSULACEAE), A NEW SPECIES FROM SOUTHERN BRAZIL Mariana C. A. Sá1 & Felipe Wartchow2 1 Universidade Federal do Rio Grande do Norte, Programa de Pós-Graduação em Sistemática e Evolução, Campus Universitário, Lagoa Nova, CEP 59072-970 Natal, Rio Grande do Norte, Brazil; [email protected] (author for correspondence). 2 Universidade Federal da Paraíba, Programa de Pós-Graduação em Sistemática e Evolução, CEP 58051-970 João Pessoa, Paraíba, Brazil. Abstract. Sá, M. C. A. & F. Wartchow. 2013. Lactifluus aurantiorugosus (Russulaceae), a new species from sou- thern Brazil. Darwiniana, nueva serie 1(1): 54-60. Lactifluus aurantiorugosus is proposed as a new species from southern Brazil. It is characterized by the small-sized basidiomata, pileus orange, glabrous and wrinkled when fresh, distant lamellae, ellip- soid and verrucose basidiospores with warts up to 0.7 µm, interconnected with incomplete reticules, a trichopalisade as pileipellis-structure, and the context of lamella and pileus with abundant sphaerocysts. Keywords. Agaricomycetes; Neotropic; Russulales; taxonomy. Resumen. Sá, M. C. A. & F. Wartchow. 2013. Lactifluus aurantiorugosus (Russulaceae), una nueva especie del sur de Brasil. Darwiniana, nueva serie 1(1): 54-60. Se propone a Lactifluus aurantiorugosus como una nueva especie del sur de Brasil. Se caracteriza por basidiomas de pequeño tamaño, con un píleo de color naranja, glabro y arrugado cuando fresco, laminillas distantes, basidiosporas elipsoides, verrugosas, con verrugas hasta de 0,7 µm, interconectadas con retículos incompletos; pileipellis formada por una estructura en tricopalisada y el contexto de las laminillas y del píleo con abundantes esferocistos. Palabras clave. Agaricomycetes; Neotrópico; Russulales; taxonomía. INTRODUCTION Studies in Lactarius in southern Brazil are scarce, and the Priest Johannes Rick firstly referred The genus Lactifluus (Pers.) Roussel was pro- to it from the state of Rio Grande do Sul. Rick posed after a phylogenetic study of Russula Pers. (1906, 1907, 1930, 1938) reported or described and Lactarius Pers. by Buyck et al. (2008), who Lactarius adustus Rick, Lactarius braunii Rick, concluded that the genera Lactarius and Russula Lactarius distans Peck, Lactarius fuliginosus (Fr.) were weakly supported, and proposed a new ge- Fr., Lactarius helvus (Fr.) Fr., Lactarius russula nus, Multifurca Buyck & V. Hofstetter, and an- Rick and Lactarius steffenii Rick. Later, Singer other group erected later as Lactifluus (Buyck et (1953) confirmed only Lactarius braunii and al., 2010). Later, Verbeken et al. (2011, 2012) and Lactarius russula as accepted species, and then Stubbe et al. (2012) proposed new combinations all taxa were summarized in Rick’s posthumous from Lactarius to Lactifluus, although those com- work published by Priest Balduíno Rambo (Rick, binations did not include any species from Brazil. 1961). In recent works, other taxa were reported Original recibido el 4 de abril de 2013, aceptado el 12 de junio de 2013 Editor Asociado: Fernando Biganzoli 54 M. C. A. Sá & F. WARTCHOW. Lactifluus aurantiorugosus from Brazil from southern Brazil, as Lactarius argillaceifolius ra & M. Cavalc. from section Phlebonemi (Wart- Hesler & A.H. Sm. var. argillaceifolius, Lactarius chow et al., 2013), and Lactifluus dunensis Sá & deliciosus (L.) Gray, Lactarius fragilis (Burl.) Wartchow from section Tomentosi (Sá et al., 2013), Hesler & A.H. Sm. var. fragilis, Lactarius rufus both from northeastern Brazil. We describe here an (Scop.) Fr., Lactarius rufus var. parvus Hesler & interesting Lactifluus as a new species from the A.H. Sm. (these from exotic Pinus plantations) southern Brazilian region of Rio Grande do Sul. and Lactarius venezuelanus Dennis (Singer et al., 1983; Buyck & de Meijer, 1999; Giachini et al., 2000; de Meijer, 2001, 2006; Sobestiansky, 2005; MATERIALS AND METHODS Karstedt & Stürmer, 2008). The genus Lactifluus was divided into six sub- The proposed new species was collected at the genera according to Verbeken et al. (2011; 2012), State of Rio Grande do Sul, in an Atlantic Forest Stubbe et al. (2012), and Sá et al. (2013) (Table 1). fragment, in a location called “Perdida”, munici- The section Aurantiifolii was not assigned to any pality of Morrinhos do Sul (29º 21’ 30” S, 49º 58’ subgenus. One hundred twenty new combinations 35” W), at about 440 to 480 m elevation. The area were performed in the genus Lactifluus in the last contains, among others, members of Euphorbiace- years (Verbeken et al., 2011, 2012; Stubbe et al., ae and Myrtaceae (Jarenkow, 1994) that are puta- 2012; Sá et al., 2013). tive ectomycorrhizal trees (Smith & Read, 2008). The studies of the genus Lactifluus in Brazil are Melzer’s reagent and KOH 3% were used for very recent and only two species are known for this microscopic studies. Terminology for microstruc- country: Lactifluus batistae Wartchow, J.L. Bezer- tures followed Verbeken (1998) and Verbeken & Table 1. Subgenera and sections of Lactifluus (Verbeken et al., 2011, 2012; Stubbe et al., 2012; Sá et al., 2013). Subgenus Sections Distribution Subg. Edules (Verbeken) Verbeken endemic to tropical Africa Sect. Lactariopsis Verbeken Subg. Lactariopsis (Henn.) Africa, North America, Europe Sect. Chamaeleontini (Verbeken) Verbeken Verbeken and Asia, Sect. Albati (Bataille) Verbeken Subg. Russulopsis (Verbeken) Verbeken Sect. Russulopsidei (Verbeken) Verbeken endemic to tropical Africa Sect. Rubroviolascentini (Singer) Verbeken endemic to tropical Africa Sect. Polysphaerophori (Singer) Verbeken Africa and one South American species Sect. Pseudogymnocarpi (Verbeken) Verbeken Africa and one Chinese species Subg. Lactifluus Africa, South, North and Central Sect. Phlebonemi (R. Heim ex Verbeken) Verbeken America, Australia, Europe and Asia Africa, South, North and Central Sect. Tomentosi (McNabb) Verbeken America, Australia, Europe and Asia Sect. Lactifluus Asia, American, and European Sect. Piperati (Fr.) Verbeken Subg. Piperati Verbeken Europe, Asia and North America Sect. Allardii (Hesler & A.H. Sm.) De Crop Subg. Gerardii (A.H. Sm. & North America, Asia and Australia Hesler) Stubbe Sect. Aurantiifolii (Verbeken) Verbeken Tropical Africa 55 DARWINIANA, nueva serie 1(1): 54-60. 2013 Walleyn (2010). Basidiome colors were observed Pileus 27-45 mm, plane-convex depressed to in fresh material, and were coded following Ko- deeply depressed, orange (between 68A-68C) rnerup & Wanscher (1978). For scanning elec- sometimes slightly darker (8D8) and margin tron microscopy (SEM) studies, sections were yellowish (between 4A4-4A5), surface moderate- removed from dried basidiomata and mounted ly viscid, smooth (shallowly velvety in dried state), directly on aluminum stubs using carbon adhe- radially rugulose-venose; margin entire, incurved sive tabs. The fragments were coated with gold in young basidiome and straight and more undu- using a sputter coater and examined in Shimadzu late in older ones; context 4 mm thick at centre, SSX-550. Presentation of basidiospore data fol- gradually thinning toward the margin; white, un- lowed the methodology proposed by Tulloss et changing; exuding abundant latex. Lamellae short al. (1992), and implemented by Wartchow (2012) decurrent, pale cream (1A2 or 1B3), distant, up to and Wartchow et al. (2012). 2-3 mm broad, tough; edge smooth, concolorous; Statistics were based on the measures of 30 lamellulae frequent, attenuating in step to subtrun- basidiospores. Abbreviations included: L(W) cate, with several lengths. Stipe 24-35 × 7-10 mm, = basidiospore lengths (width) average from a central (only one basidiome more or less eccen- single basidiome, Q = length : width ratio range tric), more or less cylindrical but sometimes taper- as determined from all measured basidiospores, ing toward the base, slightly tapering near the base, and Qm = Q value average from all basidiospore pale cream (1B4) sometimes slightly darkening measures within a single basidiome. (between 4C5 and 4C6), smooth; context whitish, The electronic version of this article in Por- solid, unchanging. Latex watery white, abundant, table Document Format (PDF) represents a pub- unchanging. lished work according to the International Code Basidiospores (7-)7.5-10.5 × (4.7-)6-8 µm of Nomenclature for algae, fungi, and plants, (L = 8.9 µm, W = 6.7 µm, Q = (1.19-)1.22-1.44 and hence the new names contained in the elec- (-1.45), Qm = 1.32), broadly ellipsoid to ellipsoid; tronic version are effectively published un- ornamentation amyloid, finely verrucose with each der the Code from the electronic edition alone. wart ranging to 0.7 µm high, interconnected by The online version of this work is archived and a fine line, but very infrequently forming