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Instituto de Biologia Unicamp






ABSTRACTA IB (2) - 1999


P060-99 Reproductive system and crossing potential in three species of Bulbophyllum (Orchidaceae) occurring in Brazilian "campo rupestre" vegetation.

Borba EL, Shepherd GJ, Semir J*

Experimental self-, cross- and interspecific pollinations were carried out in Bulbophyllum weddellii, B. involutum and B. ipanemense (Orchidaceae). The last two species are closely related, but B. weddellii is somewhat more distant. The results agree with current hypothesis that suggest that interspecific crossing rates reflect phylogenetic proximity. Examination of pollen tube growth and aborted fruits suggests that a series of factors may be involved in the high abortion rate for fruits and large proportion of seeds without embryos. The low interspecific fertility noted for B. weddellii and B. involutum is important in the maintenance of isolation between these species that are sympatric, flower in the same period and share the same pollinators. Plant, Systematics and Evolution 217:205-214, 1999. IF= 0.824

P061-99 Morfologia e anatomia da sementes de Schinus terebenthifolius Raddi (Anacardiaceae)

Carmello-Guerreiro SM*, Paoli AAS

Schinus terebinthifolius fruit contains only one seed which is reniform, with a smooth pale-brown membranaceous seed coat, with a small dark brown saddle-shaped patch. It is an exalbuminosous seed and the main reserve foods in the cotyledons are proteins and lipids. The ovule is anatropous, bitegmic, crassinucellar with well developed rafe, inserted in an apical-lateral position in the fruit. The outer tegument is continuous with the base of the funicle and has been interpreted as a funicular partially tegumentar obturator. The hypostase is tanniferous and results from the chalazal and nucelar tissues. The presence of remains of the funicle fused to the seed-coat is considered as an vestigial aril. The seed-coat has double origin, a partially pachychalazal one, that is externally evident, in the mature seed, as a small dark brown saddle-shaped patch, and a tegumentary origin, as well. Revista Brasileira de Botânica 22: 91-98, 1999

P062-99 Leaf ecology of pre-reproductive ontongenetic stages of the palm tree Euterpe edulis Mart (Arecaceae).

Carvalho RM, Martins FR, Santos FAM

We studied leaves of 208 seedlings, infants and juveniles of Euterpe edulis, randomly selected from plants in 1 ha of swampy forest in SE Brazil. Each new leaf begins extending after the complete development of the preceding leaf, in the sequence: emergence, linear growth while closed, and opening of the segments, followed by logarithmic growth of the petiole. Average leaf production rate (2.21 leaf plant-1yr-1) did not vary among ontogenetic stages, conforming to a plastochronic rhythm. Average linear growth rate of the closed leaf was directly related to the average area of the open lamina. Herbivores included damping-off-inducing suckers, ordinary suckers, chewers, miners, and multiple attacks, and attacked 33.0% of all leaves (up to 10% lost area). These attacks varied among stages, as did leaf mortality rates. Unknown factors were the main leaf mortality factor. Not losing a leaf while a seedling and attaining a minimum leaf area in the infant stage are critical events for survival. Plants gain leaf area by not losing leaves while a seedling, by producing larger leaves with greater growth rates, and by accumulating leaves with longer lifespans. The petiole can simulate an energetically cheaper branch, delimit a vital space around the stem, favourably position the leaf lamina and substitute provisionally for stem growth in height. Annals of Botany 83: 225-233, 1999. IF= 1.301

P063-99 The woody flora of cerrado vegetation in the state of Piauí, northeastern Brazil

Castro AAJF, Martins FR*, Fernandes AG

Edinburgh Journal of Botany 55: 455-472, 1999

P064-99 How rich is the flora of Brazilian cerrados?

Castro AAJ, Martins FR, Tamashiro JY, Shepherd GJ*

An attempt is made to summarize what is known about the richness of the total terrestrial angiosperm flora of the "cerrados" (as a complex of formations) in Brazil, based on published surveys and species lists. A "refined" list of arboreal and shrubby species was compiled from a total of 145 individual lists from 78 localities, taking into account synonymy and recent taxonomic changes. The refined list had 1709 references to taxonomic entities at the species level (973 identified with confidence and 31 with aff. or cf. ), 572 references to generic entities (363 genera identified with confidence), and 210 references to the family level (88 families identified with confidence). These data suggest a total of around 1000 to 2000 arboreal and shrubby species and 2000 to 5000 herbaceous ones, yielding estimates for the total cerrado flora (terristrial angiosperms) ranging from 3000 to 7000 species. These limits, especially the upper one, are dubious, but give an idea of the magnitude of the angiosperm flora in the Brazilian cerrados. Surveys of cerrados are very unevenly distributed, and studies of relatively unknown sites may reveal much more diversity than that presently known.
Annals of the Missouri Botanical Garden 86: 192-224, 1999. IF= 1.897

P065-99 A new species of Xylopia L. (Annonaceae) from Bahia, Brazil

Dias MC, Kinoshita LS*

Xylopia is a pantropical genus comprising around 160 species. It is one of the largest genera in the Annonaceae and belongs to the subfamily Annonoideae, tribe Unoneae and subtribe Xylopiineae. In the American continent, there are c. 50 species, the greatest concentration occurring in South America, especially in the Amazonian region and northwards. In an account of the extra-Amazonian species of Xylopia in Brazil, a new species was recognized and is described here as X. involucrata.Kew Bulletin 53(2): 471-474, 1999

P066-99 Distinctions among three Simarouba species

Franceschinelli EV, Yamamoto K, Shepherd GJ*

Simarouba amara is frequently confused with two other continental species of the neotropical genus, S. glauca and S. versicolor. Cluster and Principal Component Analyses were applied to verify the distribution and variation of the main diagnostic characters proposed in early revisions: flower and anther size, stamen appendage indument, leaflet surface, and venation features. Overlapping of characteristics in boundary populations of the three species was found. Geographical and morphological data other than leaf features also proved to be useful for species identification.
Systematic Botany 23: 479-488, 1999. IF= 1.763

P067-99 Simaba docensis, a new Brazilian species of Simaroubaceae

Franceschinelli EV, Yamamoto K*

Simaba docensis, a new species of Simaroubaceae, is described and illustrated. Its geographical distribution seems to be restricted to semideciduous forest in the region of the Rio Doce basin, Minas Gerais, Southeast Brazil. Accordingly, it is likey to be a rare endemic and endangered species. It belongs to the section Floribundae Engler. The new species is very closely related to the only amazonian species of this section, S. paraensis Ducke, from which it is basically distinguished by the number and shape of leaflets, leaf indument, and flower and fruit size.Novon 9: 345-348, 1999

068-99 Two new Melastomataceae from São Paulo, Brazil

Goldenberg R, Martins AB*

Meriania sanchezii and Miconia picinguabensis, two new melastome species from São Paulo, Brazil, are described and illustrated. Both occur in the forests on the slopes of Serra do Mar/Serra da Bocaina, in the eastern part of the state, near the Rio de Janeiro border. Kew Bulletin 54: 465-470, 1999

P069-99 As Apocynaceae S. Str. da região de Bauru, São Paulo, Brasil

Koch I, Kinoshita LS*

As Apocynaceae s. str. da região de Bauru, São Paulo, Brasil. Este trabalho consistiu no levantamento das Apocynaceae na Região de Bauru, centro-oeste do estado de São Paulo, em diferentes tipos de vegetação. Foram encontradas 25 espécies, distribuídas em 15 gêneros, reprsentadas nesta ordem: Forsteronia G. Mey., cinco espécies: Aspidosperma Mart., quatro espécies: Mandevilla Lindl., três espécies: Prestonia R. Br., duas espécies, e Condylocarpon Desf. Hancornia Gomez, Himatanthus Willd. ex. Roem. Et Schult. Macrosiphonia Mull. Arg., Mesechites Mull. Arg., Odontadenia Benth., Peltastes Woodson, Rhodocalyx Mull. Arg. Secondatia A. DC. Tabernaemontana L. e Temnadenia Miers, uma espécie cada. São apresentadas chaves de identificação, descrições e ilustrações das espécies, além de dados de distribuição geográfica, floração e frutificação.Acta Botanica Brasilica 13: 61-86, 1999


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