Kelly Regina Batista Leite

A contribuição da anatomia foliar para a taxonomia de Raddia Bertol. (Poaceae: Bambusoideae)

Raddia is an herbaceous bamboo genus with nine species in Brazil, one of which extends beyond Brazilian borders. The leaf anatomy of these species was analyzed using optical and scanning electron microscopy, in order to obtain useful characters for the taxonomy of the genus. Other herbaceous bamboos were used for comparison and no characters exclusive to Raddia were found. Leaf anatomy traits had little to do with species delimitation within the genus, sometimes separating only groups of species. Of these traits, the most important were as follows, in transverse section: form of the midrib, position of the intermediate vascular bundle, number of vascular bundles adjacent to the intermediate bundle and form of the fusoid cells. A surface view of the epidermis (SEM) showed differences among the species as regards occurrence, density and distribution of the papillae. Raddia megaphylla R.P. Oliveira & Longhi-Wagner and R. guianensis (Brongn.) Hitchc. & Chase had the largest number of exclusive characters of the species studied. A type of trichome unknown in Bambusoideae was recorded for R. stolonifera R.P. Oliveira & Longhi-Wagner.

Anatomia de espécies anfíbias de Cyperaceae de lagoas do semi-árido, BA, Brasil

We examined the anatomy of roots, rhizomes, leaves, and scapes of Cyperus odoratus L., Oxycaryum cubense (Poep. & Kunth) Lye, and Pycreus macrostachyos (Lam.) Raynal (Cyperaceae-Poales) from temporary lakes in the semi-arid region of Bahia in order to characterize the anatomy and examine structural adaptations to amphibious lifestyle. All species had roots with uniseriate epidermal cells, cortex with exoderm and air canals. The rhizomes had amphivasal or collateral vascular bundles in the vascular cylinder. The leaves had uniseriate epidermal cells with external periclinal cell walls thicker than the inner walls, stomata on the abaxial leaf surface, chlorenchyma alternating with air canals, and collateral vascular bundles. The scapes had uniseriate epidermal cells, fibrous groups distributed peripherally, alternating with chlorenchyma, air canals, and collateral vascular bundles. Oxycaryum cubense differs from Cyperus odoratus and Pycreus macrostachyos by having roots with long hairs; rhizomes and stolons with collateral vascular bundles; leaf blades with acute margins, and lacking Kranz structures in leaves and scapes. Anatomic characters such as the presence of large air canals principally in the roots, bulliform cells on the adaxial face of the leaf epidermis, hypodermis, reduced numbers of xylem vascular elements and little lignification of the cell walls of the different plant organs are considered important features in the adaptation of these amphibious plants that inhabit temporary lakes in the semi-arid region of Bahia state.

Pariana multiflora (Poaceae, Bambusoideae, Olyreae), a New Species from Eastern Brazil, with Notes on the Leaf Anatomy of the Genus

Abstract A new species of Pariana, found only in remnants of the Atlantic moist forest in the state of Espírito Santo in eastern Brazil, is described. The inflorescence structure in the new Pariana multiflora resembles those of P. lanceolata and P. carvalhoi, two species endemic to the Atlantic moist forests in southern Bahia, and all three are considered CR (critically endangered) by IUCN Red List criteria. The new species differs mainly by a greater number of inflorescences (up to five) per fertile culm and by the purple adaxial surface of the leaf blade, as well as by conical papillae and long unicellular trichomes that are present on both adaxial and abaxial leaf blade surfaces. Description of its morphology and leaf anatomy, compared with the other two mentioned species, based on optical microscopy and scanning electron microscopy, as well as illustrations and ecological data, are provided.

Comparative analysis of the leaf anatomy in two Parodiolyra species (Poaceae: Olyreae) occurring on forests in Eastern Brazil

Parodiolyra is a member of Olyreae, a tribe of herbaceous bamboo species within the Poaceae. The genus has five species, four of which were previously regarded as belonging to Olyra L. Parodiolyra has a Neotropical distribution and only two species occur on forests in Eastern Brazil: P. micrantha (Kunth) Zuloaga & Davidse and P. ramosissima (Trin.) Soderstr. & Zuloaga, the first widely distributed in the Neotropics while the second is endemic to the state of Bahia. Leaf anatomy of the two species was analysed with the aid of an optical microscope. The objective was to describe the microscopic characters and evaluate if they can be useful for the taxonomy of the genus. The observed anatomical structures did not differ from other genera of herbaceous bamboos, however some characters, both from the mesophyll and the epidermis, were useful to delimit the two species.

Paspalum giuliettiae (Poaceae, Panicoideae), A New Grass from ‘Campos Rupestres’ of the Chapada Diamantina, Bahia, Brazil

Abstract A new grass species from Brazil, Paspalum giuliettiae, is herein described, illustrated, and compared with some congeners. This new species shares inflorescences with subconjugate primary branches and solitary glabrous spikelets with P. pumilum, but it differs in macromorphological characters and in leaf anatomy. Paspalum giuliettiae has been collected in the Chapada Diamantina, which is the northern portion of the Espinhaço Range, in the central region of the State of Bahia, Brazil. This new Paspalum grows in humid or swampy places in the ‘campos rupestres’ vegetation, above 1,000 m, and seems to be endemic to this region.