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A–H. Dyckia nobilis H. Büneker, K. Soares & L.C. Assis ( Büneker 296 et al. ). A. Habitat. B. Grouped individuals in habitat . C. Fertile specimen in habitat . D. Rosette. E. Branched inflorescence. F. Flower in lateral view. G. Inflorescence detail. H. Inflorescence detail with flowers in bud.
Source publication
Dyckia nobilis, a new species of Bromeliaceae (Pitcairnioideae) from the Espinhaço Mountain Range (Minas Gerais, Brazil), is hereby described and illustrated. A summary of information on the species of the Dyckia sordida complex (i.e. D. inflexifolia, D. sordida and D. ursina), to which this new species belongs, is provided, including data on habit...
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Citations
... This is especially true because of the high richness of the genus in the Brazilian Cerrado and Caatinga domains. Moreover, most of the endemic species in these domains are also micro-endemic and restricted to a few localities or a single mountain range or rocky outcrop (e.g., Leme et al. 2012;Forzza & Leme 2015;Büneker et al. 2016). The very restricted distributions places most of these species at some level of threat Gomesda-Silva et al. 2017), which is especially concerning due to human induced degradation, such as mining, invasive species and frequent fires (Forzza & Leme 2015) that can rapidly jeopardize the conservation of some populations. ...
Dyckia is a South American genus mostly distributed in the Brazilian Cerrado and Caatinga domains, which are part of the South American dry diagonal where it represents an important floristic and ecological component. Following phylogenetic studies, the genus was recently expanded to include species previously placed in Encholirium and Deuterocohnia. With this new delimitation, Dyckia comprises ca. 220 species, of which some are micro-endemic. We present novelties in the genus for the South American dry diagonal based on field-work, herbarium specimens and the literature. Two new micro-endemic species are described: Dyckia avacanoeira, endemic to Chapada dos Veadeiros; and Dyckia oreadica, endemic to the Jalapão region. We provide complete descrip-tions, illustrations, distribution maps, photographs, preliminary conservation as-sessments and comments on the taxonomy and ecology of the two species. Additionally, in view of the new circumscription of Dyckia, we provide a new name, Dyckia viridiflora, to replace an illegitimate name, and a new combination, Dyckia josinoi-narcisae, for a species previously placed in Encholirium.
... Despite being well documented in the literature, especially in taxonomic studies, the peltate trichomes of nomophyles have been the main focus of morphological comparative analyses and, to our knowledge, there are no studies specifically focusing on the indument of reproductive organs in Bromeliaceae. In Dyckia, the presence of indument in the peduncle, bracts and sepals is important in the characterization of some species (Smith & Downs 1974), and even for the proposition of infrageneric groupings (Büneker et al. 2016), although details of the constitution of this indument are generally neglected. In the species analyzed here, in addition to the presence of indument in the bracts and different floral parts, there are details of the structure of the peltate trichomes, mainly in the cells of the shield that are useful in the characterization of species, of note, the presence of polymorphic trichomes in the perianth, which were previously unknown in Dyckia. ...
Th is paper presents a morphological analysis of the fl ower and fl oral trichomes of three rare species of Dyckia: Dyckia ibicuiensis, D. polyclada and D. racinae. Flowers at anthesis were collected from natural populations and subjected to morphometric and microscopic analysis. Among the most representative features for Dyckia are: morphometrics of individual fl oral parts; the general confi guration of the androecium and gynoecium; the degree of fusion of the stigmatic lobes; the morphology of the ovules, especially in relation to the chalazal appendix; and the presence and constitution of peltate trichomes in the perianth, which exhibited a polymorphism not previously reported for Dyckia. Th e characters were eff ective at describing each species, proposing phylogenetic inferences and recognizing infrageneric groupings. We propose two species groups, which are consistent with previous hypotheses about the relationships among the species of the genus. Th e objective of this study was to provide fl oral morphological data useful for characterizing these three rare species, delimiting the genus and forming phylogenetic hypotheses.
We propose the re-establishment of Dyckia tomentosa, after rediscovering its populations, the synonymization of Dyckia polyclada, and Dyckia magnifica as a new species from southern Brazil that is morphologically related to D. tomentosa. Descriptions of external morphology, leaf anatomy and pollen morphology, and comments on species distributions and habitats are provided. The informal species complex in which D. magnifica and D. tomentosa are placed is morphologically re-circumscribed and proposed here as the “Dyckia selloa complex”.
An illustrated checklist of the species of Bromeliaceae from the Serra do Cabral, Minas Gerais state, southeastern Brazil is presented, including 20 species in 11 genera from three subfamilies. Subfamilies Tillandsioideae and Bromelioideae each contain eight species, which mainly inhabit rocky fields. Tillandsia is the most diverse genus, with six species. Subfamily Pitcairnioideae contains four species, including Dyckia spinulosa, as well as Dyckia oscari, a new species described and illustrated herein.
