New Combinations and New Names in Some Brazilian Microlicieae (Melastomataceae), with Notes on the Delimitation of Lavoisiera, Microlicia, and Trembleya

Almeda, Frank; Martins, Angela Borges

doi:10.2307/3393198

Cited by 49 publications

(70 citation statements)

References 4 publications

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“…Vale destacar que M. pulchra é a única espécie deste gênero que apresenta columela persistente no fruto (Pataro et al 2013), caráter reportado anteriormente apenas para espécies de Lavoisiera (Almeda & Martins 2001).…”

Section: Resultsunclassified

“…Lavoisiera é um gênero endêmico do Brasil, com 41 espécies, a maioria delas ocorrendo no Cerrado, principalmente nos campos rupestres dos estados de Minas Gerais, Bahia e Goiás (Almeda & Martins 2001;Fritsch et al 2004;BFG 2015). Espécies de Lavoisiera diferenciam-se pelas flores 6-meras e cápsula deiscente da base em direção ao ápice (Almeda & Martins 2001 Lavoisiera harleyi é endêmica da Chapada Diamantina, ocorrendo nos campos rupestres dos municípios de Abaíra, Mucugê, Palmeiras e Rio de Contas (Santos & Silva 2005). Coletada com flores de outubro a abril e com frutos em outubro.…”

Section: Resultsunclassified

“…Microlicia é o maior gênero da tribo Microlicieae, com aproximadamente 130 espécies (Romero 2013) concentradas nos campos rupestres do Brasil Central, principalmente nos estados da Bahia, Goiás e Minas Gerais (Almeda & Martins 2001;Romero 2003;BFG 2015). Suas espécies são reconhecidas pelas flores 5-meras, ovário 3-5 locular e cápsula deiscente do ápice em direção à base (Almeda & Martins 2001).…”

Section: Chave De Identificação Das Espécies De Microlicieae Do Municunclassified

“…2017 monofilética (Fritsch et al 2004), tratando-se de uma das principais tribos da família nas formações campestres brasileiras (Almeda & Martins 2001), com ca. de 203 espécies, das quais aproximadamente 90% são endêmicas do bioma Cerrado (BFG 2015).…”

Section: Introductionunclassified

“…Grande parte das espécies está distribuída nos campos rupestres dos estados de Minas Gerais e Bahia (Fritsch et al 2004). Representantes da tribo são reconhecidos pelo hábito arbustivo, folhas geralmente imbricadas, com indumento variado, estames na maioria das vezes dimorfos, geralmente com o conectivo prolongado, com apêndice ventral, ovário glabro, frutos capsulares, com numerosas sementes, reniformes, de superfície foveolada (Almeda & Martins 2001;Fritsch et al 2004). As espécies têm distribuição centrada na América do Sul, com exceção de duas espécies de Rhynchanthera DC.…”

Section: Introductionunclassified

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Microlicieae (Melastomataceae) no município de Mucugê, Chapada Diamantina, Bahia, Brasil

2017

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Resumo AbstractThis study provides a taxonomic survey of Microlicieae tribe in the Mucugê municipality, Chapada Diamantina, Bahia, Brazil. We identified 27 species belonging to three genera: Lavoisiera (L. harleyi and L. nervulosa), Microlicia (24 species) and Trembleya parviflora. Except for Microlicia fasciculata, M. viminalis and Trembleya parviflora, the others species found in Mucugê are endemic to Chapada Diamantina, Bahia. Among the species of Microlicia, four were recently described, and four others still require further studies for its identification. Polysporangiate anthers were described for the first time for 11 species of Microlicia. The species of Microlicieae are found mainly in rocky field vegetation, between 900-1.500 m altitude, in sandy or rocky soils, sometimes associated to water streams.

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Section: Resultsunclassified

Section: Chave De Identificação Das Espécies De Microlicieae Do Municunclassified

Section: Introductionunclassified

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Microlicieae (Melastomataceae) no município de Mucugê, Chapada Diamantina, Bahia, Brasil

2017

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Leaf characters of Lavoisiera, Microlicia and Trembleya (Microlicieae, Melastomataceae) and their implications for taxonomy

2018

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In Microlicieae taxonomical delimitation of Lavoisiera, Microlicia and Trembleya is problematic. This study aims to fill this gap by identifying leaf characters that are useful for taxonomy of these genera. Species of Rhynchanthera were also included in this study for comparison, since it is an early‐diverging genus of the tribe. Diagnostic characters of Lavoisiera include sessile leaves with spongy parenchyma composed of isodiametric cells, and acute margins with supporting tissue. Trembleya is distinguished by petiolate, microphyllous, and hypostomatic leaves. The presence of depressions on the leaf surface and a homogeneous mesophyll is observed only in species of Microlicia. The leaf characters observed in Rhynchanthera, together with the available phylogenetic studies, were important to indicate evolutionary tendencies in the leaf structure within Microlicieae. Thus, our results indicate a tendency for reduction in leaf size within the tribe, in relation to both the petiole and the lamina. This reduction, which is more pronounced in Microlicia, results in a greater anatomical heterogeneity, due to variations in the organization of both vascular and fundamental tissues.

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Polysporangiate anthers in Microlicia D.Don (Melastomataceae Juss.)

2018

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Polysporangiate anthers are found in a small number of Microlicia species, a genus of Melastomataceae with a large number of endemic species in Brazil. This study describes for the first time the processes of formation and degeneration of the septa found in these particular anthers of Microlicia, providing relevant information about the structure and the functional role of septate anthers in the genus, which is an uncommon condition in angiosperms. The formation of septa begins when some initial cells enlarge and differentiate into sporogenous tissue, while other, more peripheral cells, are not affected by this increase and form the parenchymatous septum. The septa are present up until microgametogenesis, degenerating after the formation of the pollen grains. The mechanism of pollen release in stages, as suggested previously by some authors, could not be demonstrated for the studied species since the septa degenerated at flower anthesis. Thus, we propose that the transverse septa present during the formation of the sporogenous tissue and microspores are associated with providing better nutritional conditions for pollen development.

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New Combinations and New Names in Some Brazilian Microlicieae (Melastomataceae), with Notes on the Delimitation of Lavoisiera, Microlicia, and Trembleya

Cited by 49 publications

References 4 publications

Microlicieae (Melastomataceae) no município de Mucugê, Chapada Diamantina, Bahia, Brasil

Microlicieae (Melastomataceae) no município de Mucugê, Chapada Diamantina, Bahia, Brasil

Leaf characters of Lavoisiera, Microlicia and Trembleya (Microlicieae, Melastomataceae) and their implications for taxonomy

Polysporangiate anthers in Microlicia D.Don (Melastomataceae Juss.)

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