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NOVIDADES TAXONÔMICAS EM Echinolaena E Ichnanthus (POACEAE)

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NOVIDADES TAXONÔMICAS EM Echinolaena E Ichnanthus (POACEAE) 64º Congresso Nacional de Botânica Belo Horizonte, 10-15 de Novembro de 2013 NOVIDADES TAXONÔMICAS EM Echinolaena E Ichnanthus (POACEAE) Christian da Silva 1,* , Reyjane Patrícia de Oliveira 1 1Universidade Estadual de Feira de Santana; *[email protected] Introdução Echinolaena Desv. e Ichnanthus P. Beauv. são gêneros de gramíneas pertencentes à subfamília Panicoideae, tribo Paspaleae, os quais apresentam um histórico taxonômico interligado. Morfologicamente, compartilham a presença de espiguetas lateralmente comprimidas e o antécio superior provido de alas, cicatrizes ou protuberâncias convexas em sua base [1], mas podem ser diferenciados pelas inflorescências, as quais são racemosas em Echinolaena e paniculadas em Ichnanthus [2;3]. A espécie Ichnanthus piresii G.A.Black foi incluída na sinonímia de I. hoffmannseggii (Roem. & Schult.) Döll [2], e I. oplismenoides (Munro ex Döll) foi transferida para Echinolaena [3]. No entanto, observações de campo, análise das descrições originais e dos materiais-tipo dessas espécies, além de aspectos macro e micromorfológicos, mostraram que a circunscrição desses táxons era equivocada. Metodologia Figura. Imagens de MEV do antécio superior jovem e maduro de Ichnanthus hoffmannseggii (A-B) e I. piresii Como parte dos estudos sistemáticos em andamento (C-D). nesses gêneros, foram realizadas coletas nos estados do Maranhão, Piauí e Tocantins entre os anos de 2011 e Conclusões 2012, além de análise dos materiais depositados nos Ichnanthus piresii , anteriormente considerada sob a herbários ALCB, BR, CEN, IAN, K, MBM, NY, P, RB, sinonímia de I. hoffmannseggii , deve ser restabelecida RBR, SP e US. As imagens do antécio superior foram como espécie, e Echinolaena oplismenoides deve ser obtidas com o auxílio do microscópio eletrônico de incluída na sinonímia de I. hoffmannseggii . varredura (MEV) JEOL 6390LV. Agradecimentos Resultados e Discussão Aos curadores e funcionários dos herbários ALCB, BR, Ichnanthus piresii e I. hoffmannseggii apresentam ciclo de CEN, K, MBM, NY, P, RB, RBR, SP e US. À R.C.V.M. da vida, habitat e forma das folhas, inflorescências e Silva (IAN) pelas fotos do holótipo de Ichnanthus piresii . espiguetas similares, diferindo, porém, pelo microhabitat, Aos amigos C. Snak, A.R. Barbosa, A.C. Mota e P.L. hábito, dimensão das inflorescências e forma do antécio Viana. Ao ICMBio pela licença de coleta. À FIOCRUZ- superior e de seus apêndices alados. Tais semelhanças CPqGM pelo uso do equipamento de MEV. À FAPESB podem ser justificadas pelo fato de serem espécies- (PNX0014/2009) e ao CNPq [562349/2010-3; irmãs, como demonstrado em estudos filogenéticos 563558/2010-5; 134184/2011-4 (CS); PQ2 (RPO)] pelo recentes [4]. apoio financeiro. Ichnanthus oplismenoides foi transferida para Echinolaena [E. oplismenoides (Munro ex Döll) Stieber] Referências Bibliográficas por apresentar inflorescências racemosas [3], entretanto, [1] Clayton, W.D. & Renvoize, S.A. 1986. Genera graminum. o estudo do material-tipo [W.J. Burchell 9031 (K!, BR!, L, Grasses of the world. Kew Bulletin Additional Series 13: 1-389. LE, P!, S, US (fragms. ex BR & LE)] mostrou que este [2] Stieber, M.T. 1982. Revision of Ichnanthus sect. Ichnanthus corresponde a um espécime de I. hoffmannseggii com os (Gramineae, Panicoideae). Systematic Botany 7: 85-115. ramos de segunda e terceira ordem da panícula curtos, o [3] Stieber, M.T. 1987. Revision of Ichnanthus sect. Foveolatus que confere o aspecto racemoso à inflorescência. Esse (Gramineae, Panicoideae). Systematic Botany 12: 187-216. fato também pôde ser confirmado através do antécio [4] Silva, C. 2013. Filogenia de Ichnanthus P. Beauv. (Poaceae, superior, o qual também possui forma e apêndices alados Panicoideae) e novidades taxonômicas na tribo Paniceae s.l. idênticos aos de I. hoffmannseggii . Dissertação de Mestrado, Universidade Estadual de Feira de Santana, Bahia. .
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