Redescoberta e tipificação de Octomeria leptophylla Barb. Rodr. (Orchidaceae), micro-orquídea endêmica de Minas Gerais, Brasil

Neto, Luiz Menini; Neto, Americo Docha

doi:10.1590/2175-7860200960216

Cited by 5 publications

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“…Rodr. (Orchidaceae) é um exemplo cuja localidade-típica é a SPB, tendo sido considerada extinta por Biodiversitas (2007) e recentemente redescoberta (Menini Neto & Docha Neto 2009), embora não na SPB, mas em duas serras de municípios próximos, Andradas e Poços de Caldas, não tendo sido observada na área durante o presente estudo.…”

Section: Conservaçãounclassified

“…O incentivo à pesquisa é essencial, devido ao incipiente conhecimento científico da região. Para conservar a biota local é necessário maior comprometimento das autoridades e maior fiscalização dos órgãos ambientais, uma vez que a região está inserida em uma Área de Proteção Ambiental que por definição é uma categoria de unidade de conservação com ocupação permitida, não apresentando assim, elevado poder de conservação (Menini Neto & Docha Neto 2009 …”

Section: Conservaçãounclassified

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Flora vascular da Serra da Pedra Branca, Caldas, Minas Gerais e relações florísticas com áreas de altitude da Região Sudeste do Brasil

et al. 2013

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Serra da Pedra Branca (SPB) is a mountain range located in the Southwestern portion of the state Minas Gerais, in the municipality of Caldas (21°58'-21°55'S, 46°24'-46°22'W). It is a striking feature in the landscape, between 1100 and 1780 m.s.m., in a region that is part of the Atlantic Forest Domain and is considered as a priority area for conservation of the flora in Minas Gerais state. The vegetation is composed by a mosaic of "campo de altitude" (which occupy the greatest extension in the area), Seasonal Semidecidual Montane Forest, Dense Ombrophilous High-Montane Forest and Mixed Ombrophilous Forest. The aims of this study was the elaboration of a floristic survey of SPB added to the specimens collected by Anders Fredrik Regnell in the nineteenth century in Caldas and to analyze its floristic similarity with altitude areas of the Southeastern Region of Brazil. There were recorded 502 vascular plant species, distributed in 274 genera and 100 families. The majority of recorded species present herbaceous habit, terricolous, saxicolous and/or rupicolous (representing around 58% of recorded species), predominantly occurring in the "campo de altitude" (ca. 46%). The richest families were Polypodiaceae (20 spp.) and Dryopteridaceae (10 spp.) among the ferns, and Orchidaceae (56 spp.), Asteraceae (27 spp.) and Fabaceae (26 spp.) among the angiosperms. Just one species of gymnosperm was recorded, Araucaria angustifolia (Bertol.) Kuntze (Araucariaceae). Five new records were made for the Minas Gerais flora, 13 species are cited as threatened with extinction in the state and at least six are endemic to SPB. Amongst 127 species collected in XIX century in the region, only 29 collected again, while 375 new records were made for SPB. The analysis of floristic similarity performed between the flora of SPB and other altitude areas of Southeastern Region revealed isolation of SPB in relation to other areas, highlighting its floristic peculiarity, which can probably be explained by its location in a distinct hydrographic basin. The vegetation of the SPB must be considered as endangered since the presence of endemic species and/or threatened species, associated with local environmental conditions suffering accelerated rate of destruction, highlight the need for urgent actions to preserve local biodiversity.

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Section: Conservaçãounclassified

Flora vascular da Serra da Pedra Branca, Caldas, Minas Gerais e relações florísticas com áreas de altitude da Região Sudeste do Brasil

et al. 2013

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“…This subtribe is found in the Neotropics, from Argentina to southern Mexico. Micro-orchids in the Atlantic Forest in Brazil, which is home to a large number of micro-orchid endemic species and is one of the most threatened extinction biomes on the planet, face extreme extinction pressures with a reduction in the original habitat of over 90% [ 18 – 20 ]. Most species of Pleurothallidinae have no great commercial appeal, due to the small dimensions of the plants and their flowers, as well as the difficulties of cultivation [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…Micro-orchids in the Atlantic Forest in Brazil, which is home to a large number of micro-orchid endemic species and is one of the most threatened extinction biomes on the planet, face extreme extinction pressures with a reduction in the original habitat of over 90% [ 18 – 20 ]. Most species of Pleurothallidinae have no great commercial appeal, due to the small dimensions of the plants and their flowers, as well as the difficulties of cultivation [ 18 ]. There are few studies of asymbiotic germination of micro-orchids, which have shown low germination rates and slow growth of seedlings [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Asymbiotic germination and morphological studies of seeds of Atlantic Rainforest micro-orchids (Pleurothallidinae)

et al. 2020

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The morphological and morphometric characters of seeds belonging to 11 species of the subtribe Pleurothallidinae using light and scanning electron microscopy were studied to understand the in vitro germination process. Qualitative data (color, shape, ornamentation) and quantitative ones were also evaluated in seeds and embryos (length, width, volume and air space percentage between the integument and the embryo). The viability of the seeds was evaluated by in vitro germination in woody plant medium (WPM), and by analysis of the developmental stages of protocorms until seedling formation (two to 24 weeks). Morphometric data showed variations within the genus Acianthera and between species of different genera. The best germination and protocorm formation responses occurred with Acianthera prolifera (92%) and Acianthera ochreata (86%), with the formation of seedlings after 12 and 16 weeks of sowing, respectively. The seeds and embryos of A. prolifera and A. ochreata were larger (length, width, and volume) with a structural polarity that may have facilitated their germination comparing to others studied species. Other characteristics of A. prolifera seeds that may have contributed to these results include the presence of a thin testa without ornamentation and a suspensor. The protocorms of Anathalis obovata, Dryadella liliputiana, and Octomeria gracillis developed slowly in the WPM, not reaching the seedling stage in 24 weeks of cultivation. This morphological and morphometric study contributes to the understanding of asymbiotic germination of some micro-orchid species.

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Nomenclatural notes on species of Macradenia (Orchidaceae) described by João Barbosa Rodrigues

Koch

Ilkiu–Borges

Barros

2016

TAXON

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During the taxonomic revision of the genus Macradenia, we observed that a review was needed concerning four names, M. delicatula,M. paraensis, M. regnellii, and M. rubescens, published by the Brazilian botanist João Barbosa Rodrigues. Original illustrations are designated as lectotypes for M. paraensis, Trichopilia multiflora (a synonym of M. paraensis) and M. rubescens. Macradenia rubescens is treated as a synonym of M. surinamensis, the latter lectotypified here using a Wullschlaegel specimen from GOET. A Warming specimen at W is designated as the lectotype of Warmingia eugenii, and W. loefgrenii and M. regnellii, two synonymys of W. eugenii, are lectotypified from specimens at BR and P, respectively. No original material is known for M. delicatula, and, as a result, the precise application of this name is uncertain.

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Redescoberta e tipificação de Octomeria leptophylla Barb. Rodr. (Orchidaceae), micro-orquídea endêmica de Minas Gerais, Brasil

Cited by 5 publications

References 1 publication

Flora vascular da Serra da Pedra Branca, Caldas, Minas Gerais e relações florísticas com áreas de altitude da Região Sudeste do Brasil

Flora vascular da Serra da Pedra Branca, Caldas, Minas Gerais e relações florísticas com áreas de altitude da Região Sudeste do Brasil

Asymbiotic germination and morphological studies of seeds of Atlantic Rainforest micro-orchids (Pleurothallidinae)

Nomenclatural notes on species of Macradenia (Orchidaceae) described by João Barbosa Rodrigues

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