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RODRIGUESIA Revista Do Jardim Botânico Do Rio De Janeiro Volume 51 Número 78/79 2000 Ú

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RODRIGUESIA Revista Do Jardim Botânico Do Rio De Janeiro Volume 51 Número 78/79 2000 Ú ISSN 0370-6583 RODRIGUESIA Revista do Jardim Botânico do Rio de Janeiro Volume 51 Número 78/79 2000 Ú RODRIGUESIA Revista do Jardim Botânico do Rio de Janeiro Volume 51 Número 78/79 2000 INSTITUTO DE PESQUISAS JARDIM BOTÂNICO DO RIO DE JANEIRO Rua Jardim Botânico 1008 - Jardim Botânico - Rio de Janeiro - RJ - Tel.: 294-6012 - CEP 22460-180 ©JBRJ ISSN 0370-6583 Presidência da República FERNANDO HENRIQUE CARDOSO Presidente Ministério do Meio Ambiente JOSÉ SARNEY FILHO Ministro JOSÉ CARLOS CARVALHO Secretário Executivo Instituto de Pesquisas Jardim Botânico do Rio de Janeiro SÉRGIO DE ALMEIDA BRUNI Diretor Ficha catalográfica: Rodriguésia Publicação semestral que tem por objetivo a divul- Rodriguésia: revista do Jardim Botânico do gação de trabalhos de cunho científico e/ou técni- Rio je janeiro. .. Vol.l, n.l (1935) - cos, relativos à biologia vegetal e à descrição de . RJG de Janeiro: Instituto de Pesquisas espécies novas, além de matérias de extensão cul- Jardim Botânico do Rio de Janeiro, 1935- tural e notícias ligadas à história e às atividades do Jardim Botânico, bem como de notas prévias, rese- v. : il.; 28 cm. nhãs bibliográficas e trabalhos sobre o meio ambi­ ente Semestral inclui resumos em português e inglês „ , , „^„ „ ISSN 0370-6583 Comissão de Publicação Marli Pires Morim de Lima l Botânica. Periódicos brasileiros I. Jardim Rejan R. Guedes-Bruni Botânico do Rio de Janeiro Claudia Franca Barros Josafá Carlos Siqueira CDD - 580.5 Ricardo C. Vieira • CDU-58(01) Sumário Anatomia da madeira de quatro espécies do gênero Miconia Ruiz & Pavón (Melastomataceae) 5 Micheline Leite Marcon, Cecília Gonçalves Costa Philodendron Schott (Araceae): morfologia e taxonomia das espécies da Reserva Ecológica de Macaé de Cima - Nova Friburgo, Rio de Janeiro, Brasil 21 Marcus Alberto Nadruz Coelho Composição florística e estrutura do componente arbóreo de um trecho de Mata Atlântica na Estação Ecológica Estadual do Paraí­ so, Cachoeiras de Macacu, Rio de Janeiro, Brasil 69 Bruno Coutinho Kurtz, Dorothy Sue Dunn de Araújo ERRATA: Anatomia Foliar de Hibiscus tiliaceus L. e Hibiscus pernambucensis Arruda ( Malvaceae ) 113 Joecildo Francisco Rocha, Léa de Jesus Neves Miconia tristis Spring e Miconia doriana Cogn. (Melastomataceae): anatomia do eixo vegetativo e folhas 133 Rosângela Cristina Occhi Sampaio de Souza, Osnir Marquete índice cumulativo de artigos publicados na Rodriguésia 1935 - 2000 143 Maria de Fátima Verbicaro Ramos, Milton Ferreira Botelho, Roberto José GervásioUnger, Tânia Lúcia Resende, Tânia Maura Nora Riccieri Anatomia da madeira de quatro espécies do gênero Miconia Ruiz & Pavón (Melastomataceae)* Micheline Leite Marcon1'2 Cecília Gonçalves Costa2'3 RESUMO Neste trabalho faz-se a descrição anatômica das madeiras de Miconia cabussu Hoehne, Miconia cinnamomifolia (DC.) Naudin, Miconia rigidiuscula Cogn. e Miconia sellowiana Naudin. As quatro espécies apresentam camadas de crescimento distintas; vasos solitários e em múltiplos; placas de perfuração simples; pontoações intervasculares pequenas, alternas e ornamentadas; parênquima axial paratraqueal escasso; raios integrados por células predominantemente quadradas e eretas; fibras semelhantes a parênquima, septadas e gelatinosas. As características que se mostraram úteis para a separação das espécies foram: demarcação das camadas de crescimento em M. cabussu e M. sellowiana; presença de traqueóides em M. cabussu; pontoações raio-vasculares em M. rigidiuscula e arranjo das fibras semelhantes a parênquima em M. cinnamomifolia. A forma das pontoações intervasculares e a largura dos raios separam as espécies em dois grupos: um inclui M. cabussu e M. cinnamomifolia e o outro, M. rigidiuscula e M. sellowiana. A formação dos grupos está representada em dendrogramas construídos através da análise de agrupamento. Palavras-chaves: Anatomia da madeira, Miconia, Melastomataceae ABSTRACT The wood anatomy of Miconia cabussu Hoehne, Miconia cinnamomifolia (DC.) Naudin, Miconia rigidiuscula Cogn. and Miconia sellowiana Naudin is described. The four species show distinct growth rings; solitary and multiples vessels; simple perforated plates; small, alternate and vestured intervessel pits; paratracheal scanty axial parenchyma; rays are composed by square, upright and few procumbent cells; parenchyma-like fibre; septate and gelatinous fibres. The useful characteristics for separation the species are: growth rings boundaries in M. cabussu and M. sellowiana; vascular tracheids present in M. cabussu; vessel-ray pits in M. rigidiuscula and parenchyma-like fibres arrangement in M. cinnamomifolia. The shape of the intervessel pits and the ray width separate the species into two groups: one includes M. cabussu and M. cinnamomifolia, the other group includes M. rigidiuscula and M. sellowiana. Dendrograms done in the cluster analysis represent these groups. Keywords: wood anatomy, Miconia, Melastomataceae *Parte da Dissertação de Mestrado da primeira autora 'Bolsista da Fundação Botânica Margaret Mee instituto de Pesquisas Jardim Botânico do Rio de Janeiro Rua Jardim Botânico, 1008 - Jardim Botânico Rio de Janeiro - RJ. CEP: 22460-000 3Bolsista do CNPq Marcon, M. L. & Costa, C. G. INTRODUÇÃO Diante disto, propõe-se neste trabalho o As Melastomataceae constituem uma das estudo anatômico da madeira de Miconia famílias mais importantes da flora neotropical, cabussu, Miconia cinnamomifolia, Miconia com cerca de 5000 espécies subordinadas a rigidiuscula e Miconia sellowiana, a fim de 185 gêneros e 11 tribos (Renner 1993) e contribuir para um melhor conhecimento do apresentam um importante interesse gênero Miconia, em especial na Floresta ornamental por suas flores vistosas ou pela Atlântica. Este ecossistema, do qual fazem folhagem rajada ou pintada (Wurdack 1962). parte as três primeiras espécies, encontra-se Dividida por Cogniaux (1891) em três altamente ameaçado e está reduzido a 6% de subfamílias - Melastomatoideae, Astronoideae sua área original (Programa Mata Atlântica e Memecyloideae, as Melastomataceae 1993, Guedes-Bruni & Lima 1994). além disso, apresentam uma história taxonômica tem-se como objetivo verificar se as complicada, tendo sua divisão em subfamílias características anatômicas do lenho dessas 4 sido modificada por diversos autores (Van Vliet espécies permitem confirmar o posicionamento et ai. 1981, Baas 1981, Dahlgren & Thorne de Miconia cabussu e Miconia 1984, Johnson & Briggs 1984, Keating 1984, cinnamomifolia na seção Glossocentrum e Mentink & Baas 1992, Renner 1993). de Miconia rigidiuscula e Miconia Miconia Ruiz & Pavon, o maior gênero sellowiana, na seção Chaenanthera. Estes da família, está subordinado à subfamília dados poderão contribuir, juntamente com Melastomatoideae e à tribo Miconieae, sendo estudos posteriores, para definir o representado no Brasil por cerca de 250 posicionamento seccional de Miconia espécies muito ornamentais (Barroso et ai. sellowiana, espécie que segundo Wurdack 1984; Martins et ai. 1996). Muitas dessas poderia ser incluída na seção Glossocentrum espécies são próprias da Floresta Atlântica, por ser morfologicamente muito semelhante às desempenhando importante papel na espécies desta seção e que foi excluída por manutenção da ave-fauna local, que utiliza os Baumgratz (1984) da seção Chaenanthera, frutos de algumas dessas espécies em sua podendo segundo o autor vir a constituir, com alimentação (Relatório PMA 1995). A madeira outras espécies, uma seção à parte. das espécies deste gênero pode ser utilizada para a obtenção de carvão e empregada em MATERIAL E MÉTODOS carpintaria e em pequenas construções As amostras de Miconia cabussu, (Record & Mell 1924). Miconia rigidiuscula e Miconia sellowiana De acordo com Baumgratz (1980), o foram adquiridas nas xilotecas do Instituto de gênero Miconia apresenta uma série de Pesquisas Jardim Botânico do Rio de Janeiro dificuldades quanto à identificação de suas e do Instituto de Pesquisas Tecnológicas de espécies, muitas das quais são fundamentadas São Paulo. As amostras de Miconia em características consideradas duvidosas por cinnamomifolia foram coletadas na Reserva estarem sujeitas a variações. Problemas de Biológica de Poço das Antas, município de ordem taxonômica ocorrem também no que Silva Jardim, RJ. Todo o material analisado diz respeito ao posicionamento de determinadas encontra-se registrado na xiloteca do Instituto espécies nas seções estabelecidas por de Pesquisas Jardim Botânico do Rio de Cogniaux (1887/1888). Janeiro: Miconia cabussu (RBwl598, Tanto para a família quanto para o Laminário 1973); Miconia cinnamomifolia gênero, os estudos sobre a anatomia da madeira (RBw 7436, 7437, 7438 e 7446, Laminário são escassos, ressaltando-se os de Van Vliet 1871, 1872, 1876 e 1883); Miconia (1981), Van Vliet et ai. (1981 )e os de Welle & rigidiuscula (RBw 2175, Laminário 1972); Koek-Noorman(1978, 1981). Miconia sellowiana (RBw 1703, Laminário Rodriguésia 51(78/79): 5-20. 2000 Anatomia da madeira de quatro espécies do gênero Miconia Ruiz & Pavón (Melastomataceae) 1971). RESULTADOS O material botânico foi processado no DESCRIÇÕES ANATÔMICAS Laboratório de Botânica Estrutural do Instituto Miconia cabussu Hoehne (Figs. 1-7). de Pesquisas Jardim Botânico do Rio de Camadas de crescimento: distintas, Janeiro, onde foram confeccionados os corpos demarcadas pelo achatamento e maior de prova, posteriormente seccionados em espessamento parietal das fibras e pelo maior micrótomo de deslizamento Jung K, nos planos número de vasos no lenho tardio e, ainda, por transversal e longitudinal (radial e tangencial). porosidade em
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