Angela Borges Martins

O gênero Miconia Ruiz & Pav. (Melastomataceae) no Estado de São Paulo

The present paper deals with the species of Miconia occuring in the Brazilian State of Sao Paulo. The 53 species listed and described here probably represent all taxa of the genus collected in this State.

Tibouchina sect. Pleroma (D. Don) Cogn. (Melastomataceae) no estado de São Paulo

ABSTRACT - (Tibouchina sect. Pleroma (D. Don) Cogn. (Melastomataceae) in Sao Paulo state). Tibouchina Aubl. (Melastomeae), with about 308 species occupies a central position among neotropical Melastomataceae with capsular fruits. Several of these species are mainly concentrated in the Southeast and West-central Brazil. Tibouchina is distributed in 11 sections. This paper aimed to study the species of Tibouchina sect. Pleroma in the state of Sao Paulo. The following species are recognized: T. chamissoana Cogn., T. clavata (Pers.) Wurdack, T. estrellensis (Raddi) Cogn., T. grandifolia Cogn., T. granulosa (Desr.) Cogn., T. langsdorffiana (Bonpl.) Baill., T. martialis (Cham.) Cogn., T. riedeliana Cogn., T. serrana P. Guimaraes & A. B. Martins, T. stenocarpa (Schrank et Mart. ex DC.) Cogn., T. ursina (Cham.) Cogn. e T. urvilleana (DC.) Cogn. These species are mainly concentrated on the littoral region of the state. We provide a dichotomus key, species descriptions and illustrations.

Nomenclatural Alterations in Microlicieae (Melastomataceae)

ABSTRACT With the recent taxonomic review of Chaetostoma DC., it was found that six species did not present the set of diagnostic features established to delimit the genus. Chaetostoma is characterized by sessile, keeled to subkeeled, overlapping, acute leaves and a trichome crown on the external apex of the length of the hypanthium. Three species of Chaetostoma are transferred to Microlicia D. Don: M. acuminata Naudin (C. acuminatum (Naudin) Cogniaux), M. castrata Naudin (C. castratum (Naudin) Cogniaux), and M. oxyanthera Naudin (C. oxyantherum (Naudin) Triana). Two new names are also proposed: M. baumgratziana A. B. Martins & Koschnitzke (C. gardneri Triana) and M. semiriana Koschnitzke & A. B. Martins (C. luetzelburgii Markgraf). The new combination M. parvula (Markgraf) Koschnitzke & A. B. Martins (C. parvulum Markgraf) is provided. The name M. oxyanthera Naudin is lectotypified herein.

As Melastomataceae do município de Poços de Caldas, Minas Gerais, Brasil

This paper presents a survey of Melastomataceae collected in the Pocos de Caldas region during the research project signed between the Universidade Estadual de Campinas (FUNCAMP), and the ALCOA Aluminios. Several families were collected during this project, among them standing out the Melastomataceae, which comprises a high number of species in the local flora, with 58 species in 12 genera and three tribes. Melastomeae and Miconieae showed the higher number of species. In order to contribute to the final list of the taxa we also included specimens previously collected. We provide descriptions, illustrations, geographical distribution and a key to the genera and species studied.

Cryptic dioecy is widespread in South American species of Symplocos section Barberina (Symplocaceae)

Pollen morphology of ten Brazilian species within the South American clade (ca. 20 species) of Symplocos section Barberina (Symplocaceae) was analyzed with scanning electron microscopy to assess their reported androdioecious breeding system. All species exhibited pollen dimorphism. Pollen from male individuals is well developed and 3-colporate, whereas that from morphologically hermaphroditic individuals is malformed, often completely fragmented, lacks cytoplasm, and has no germination pores. Our results suggest that the morphologically hermaphroditic species of S. section Barberina with malformed pollen are cryptically dioecious.

Three new Brazilian species in the genus Marcetia (Melastomataceae, Melastomeae)

Three new species of Marcetia are described and illustrated. Marcetia semiriana occurs only in Serra do Cip6, Minas Gerais. Marcetia shepherdii, collected in Marai1, at sea level, and M. lychnophoroides, from Chapada Diamantina, are both endemic to Bahia. The new species Marcetia shepherdii and M. lychnophoroides, together with M. luetzelburgii Markgraf, constitute a group of closely related species. They share in common subcoriaceous, fleshy, imbricate to subimbricate, revolute leaves. Marcetia shepherdii is distinguished by its rigid, erect branchlets, yellowish green leaves that are glabrous on the adaxial surface, unappendaged and broadly dilated connectives, linear-oblong thecae with a ventrally inclined pore, and a unique 2locular ovary. Marcetia lychnophoroides has velutinous to sublanate branchlets, cinereous-green leaves that are densely puberulous-sericeous on the abaxial surface, unprolonged and inconspicuously bilobulate connectives, and a 3or 4-locular ovary. Marcetia semiriana is very similar to M. taxifolia (A. Saint-Hilaire) DC., differing in the prostrate branches, long pedunculate flowers, and straight anthers. Marcetia is a neotropical genus of 27 species largely endemic to Brazil. Except for the widespread Marcetia taxifolia, which has a bicentric distribution in eastern Brazil and northwestern South America (Colombia, Venezuela, and Guyana), all other species of Marcetia have restricted distributions. Marcetia species are usually shrubs or subshrubs that occur in campo rupestre in the Serra do Espinhago, Minas Gerais, in the mountains of Goi s, and especially in the Chapada Diamantina, Bahia. Campo rupestre is an exclusively Brazilian complex mosaic of vegetation types characterized by extensive outcrops of highly acidic rocks, nutrient-poor soils, and local variations in topography, slope, aspect, and moisture regime. A few Marcetia species occur in both montane and littoral areas, such as M. ericoides (Sprengel) 0. Berg ex Cogniaux and M. canescens Naudin. Marcetia shepherdii is the only species in the genus that is endemic to coastal Bahia, where it occurs in the sandy vegetational formation commonly referred to as restinga. The genus Marcetia can be distinguished within the tribe Melastomeae mainly by the combination of tetramerous flowers and simple anthers that lack basally prolonged connectives (except in M. shepherdii) and, in some species, may have short ventral tuberculate appendages. Three of the species studied in my taxonomic revision of Marcetia (Martins, 1989) are new. They are described and illustrated here. Marcetia shepherdii A. B. Martins, sp. nov. TYPE: Brazil. Bahia: Maraui, 4 km de Mara6, 12 Mar. 1977 (fl, fr), G. J. Shepherd, L. S. Kinoshita, J. B. Andrade & N. Taroda 4550 (holotype, UEC). Figure 1. Haec species Marcetiae luetzelburgii affinis, sed ab ea foliis arcte adpressis sessilibus revolutis dense imbricatis internodia brevia occultantibus, ramis basin versus denudatis, conspicue annulis foliorum delapsorum praeditis, lamina foliari supra glabra in sicco flavovirescenti, staminum filamentis ter longioribus, antheris apice rotundato ventraliter minute dehiscenti atque ovario biloculari differt. Erect subshrub ca. 60 cm, compactly branched; branchlets rigid, subterete to inconspicuously quadrangular, moderately puberulous or nearly glabrous, at the base defoliating with age and with conspicuous leaf scars. Leaves opposite, sessile, appressed, densely imbricate and concealing the short internodes; blade lanceolate-ovate, 2.5-3 x 1 mm, fleshy-coriaceous, basally cordate, apically recurved and mucronulate, margins revolute, glabrous on the adaxial surface, glandular-pubescent abaxially, obscurely 1-nerved. Flowers 4-merous, subsessile, solitary in upper leaf axils resembling a terminal foliaceous spiciform inflorescence, becomNOVON 10: 224-229. 2000. This content downloaded from 157.55.39.45 on Fri, 02 Sep 2016 06:22:09 UTC All use subject to http://about.jstor.org/terms Volume 10, Number 3 2000 Luckow & Du Puy Gagnebina bakoliae from Madagascar 225

Two New Dioecious Species of Symplocos (Symplocaceae) from Southern Brazil

Abstract Two new dioecious species of Symplocos Jacquin from southern Brazil are described and illustrated. Both species belong to section Barberina (Vellozo) A. DC. of subgenus Symplocos. Symplocos bidana Aranha is characterized by its cymose or racemose inflorescences (9.5–)11–34 mm long, corolla with five or six lobes 3.7–4.9 mm long, and fruits (10–)13–20 × 5–10 mm with the calyx lobes covering the fruiting disc. Symplocos incrassata Aranha is characterized by its reduced cymes, bracts caducous in fruit, and fruits 12–18 × (5–)6–8 mm. In addition, both species have thick endocarps (0.8–1.2 mm), a notable character among the Brazilian species of section Barberina.

Symplocos atlantica (Symplocaceae), A New Species from the Atlantic Rain Forest of Brazil

Abstract. Symplocos atlantica (Symplocaceae), a new species from the Atlantic Rain Forest of Brazil, is described and illustrated. The new species is morphologically similar to Symplocos glandulosomarginata and S. glaziovii, from which it can be distinguished by young leaves with an eglandular margin or rarely with 1–3 early caducous glands per cm, a pilose and dome-like to short-cylindrical disc in flower, and fertile ovules 0.2–0.5(-0.6) mm long.

New Combinations and a New Species in the Brazilian Genus Chaetostoma DC. (Microlicieae: Melastomataceae)

Four new combinations in Chaetostoma (C. albiflorum, C. cupressinum, C. selagineum, C. stenocladon,) are proposed, and a new species, Chaetostoma flavum, endemic to the Chapada dos Veadeiros, Goids, Brazil, is described. The new species can be distinguished by its 4-5-locular ovary and antisepalous stamens with prolonged appendages. Chaetostoma DC. is a genus endemic to Brazil comprising 11 species that occur in campo rupestre, campo de altitude, and campo cerrado vegetation in the states of Goids, Distrito Federal, Minas Gerais, with a less considerable representation in Bahia, Rio de Janeiro, Sio Paulo, and Parani. This genus can be distinguished within the tribe Microlicieae, especially with regard to Microlicia D. Don, to which it has the closest affinity, by the combination of the following diagnostic features: carinate, imbricate, and pungent leaves without translucent dots; the mature capsule longer than the hypanthium; and a crown of trichomes around the outward apex of the hypanthium. The distinction between Chaetostoma and Microlicia has been made by Cogniaux (1883, 1891), in the last revision of these genera, on the basis of just one character: the morphology of the stamens, considered equal in both cycles in Chaetostoma and very unequal in Microlicia. This character has proven to be unreliable, and the most striking difference between these genera is in the possession of the crown of trichomes on the hypanthium in all species of Chaetostoma, which is absent in all species of Microlicia. In a recent revision of Chaetostoma (Koschnitzke, 1997), some taxonomic novelties were recognized, and it was found necessary to propose some new combinations and a new species for the genus. Chaetostoma albiflorum (Naudin) Koschnitzke & A. B. Martins, stat. nov. Basionym: Chaetostoma pungens DC. var. albiflorum Naudin, Ann. Sci. Nat. Bot. Sir. 3, 3: 191. 1845. TYPE: Brazil. Minas Gerais: Serra de Carrancas, 1822, A. St-Hilaire s.n. (holotype, P not seen). Chaetostoma pungens DC. var. pallidiflorum Cogniaux, in Martius, F1. Bras. 14: 32. 1883. Syn. nov. TYPE: Brazil. Minas Gerais: Serra de Itatiaia, Mar. 1839, Riedel s.n. [Martii Herbar. Florae Brasil no. 922] (lectotype, selected here, BR; isolectotypes, BM, G, K, W). Chaetostoma cupressinum (D. Don) Koschnitzke & A. B. Martins, comb. nov. Basionym: Microlicia cupressina D. Don, Mem. Wern. Soc. 4: 302. 1823. TYPE: Brazil. Minas Gerais: 6 May 1819, Sellow 1329 (holotype, BM; isotype, BR). Chaetostoma luteum Cogniaux, in Martius, F1. Bras. 14: 589-590. 1888. Syn. nov. TYPE: Brazil. Minas Gerais: Sao Joao del Rey, Serra do Lenheiro, 24 June 1887, Glaziou 16769 (holotype, B destroyed; lectotype, selected here, BR; isolectotypes, C, F, G, K, MO, P, RB). Chaetostoma lutem Cogniaux var. quadrifarium Cogniaux, in A. DeCandolle & C. DeCandolle, Monogr. Phan. 7: 29. 1891. Syn. nov. TYPE: Brazil. Minas Gerais: Sgo Jolo del Rey, Serra do Lenheiro, 24 Jan. 1889, Glaziou 17503 (holotype, BR; isotypes, BR, C, F, G, K, P, R). Chaetostoma trauninense Cogniaux, in A. DeCandolle & C. DeCandolle, Monogr. Phan. 7: 30. 1891. Syn. nov. TYPE: Brazil. Minas Gerais: Sao Joao del Rey, Serra do Lenheiro, 24 June 1887, Glaziou 16769a (lectotype, selected here, BR; isolectotypes, B, C, F, K, RB). Chaetostoma joannae Cogniaux, in A. DeCandolle & C. DeCandolle, Monogr. Phan. 7: 28. 1891. Syn. nov. TYPE: Brazil. Minas Gerais: Serra do Lenheiro, 1889, Glaziou 17504 (lectotype, selected here, BR; isolectotypes, B, BR, C, F, G, K, P). Chaetostoma selagineum (Naudin) Koschnitzke & A. B. Martins, comb. nov. Basionym: Microlicia selaginea Naudin, Ann. Sci. Nat. Bot. Sdr. 3, 3: 188. 1845. TYPE: Brazil. Goids: Chapadao, A. St-Hilaire 550 (holotype, P not seen; isotype, F). Chaetostoma stenocladon (Naudin) Koschnitzke & A. B. Martins, comb. nov. Basionym: Microlicia stenocladon Naudin, Ann. Sci. Nat. Bot. Sdr. 3, 3: 188. 1845. TYPE: Brazil. Goids: Serra dos Pirineus, 17 June 1819, A. St-Hilaire s.n. (holotype, P not seen; isotype, F). NovoN 9: 202-204. 1999. This content downloaded from 157.55.39.173 on Thu, 19 May 2016 05:43:20 UTC All use subject to http://about.jstor.org/terms Volume 9, Number 2 1999 Koschnitzke & Martins Chaetostoma from Brazil 203

Morfologia dos tricomas em Tibouchina sect. Pleroma (D. Don) cogn. (melastomataceae)

The Melastomataceae display greater trichome diversity. Dr. Wurdack, in his Atlas of hairs, recognized 46 types of trichomes for the Neotropical Melastomataceae through the Scanning Electron Microscope (SEM), and referred 17 of them to the genus Tibouchina. The trichome morphology has been extensively used in the delimitation of the taxa in Melastomataceae, as well as in previous studies by Cogniaux, the monograph of Brazilian Melastomataceae published in 1885. The morphology of the trichomes was essential for the delimitation of several species in Tibouchina section Pleroma. The use of SEM provided the best characterization of the 15 different types of trichomes recognized among the 41 species examined. These were described based on the morphological appearance, both optical microscopy and scanning electron microscopy, and illustrated by scanning electron micrographs and photomicrographs.