About: Bulbophyllum is a research topic. Over the lifetime, 213 publications have been published within this topic receiving 1327 citations.
Papers published on a yearly basis
TL;DR: These findings corroborate the hypothesis that, because pollination in these species is dependent on an unpredictable external factor (wind), nectar is necessary to keep the insect in the flower for a long period.
TL;DR: The presence of osmophores on the sepals reinforces that this localization is common among the Pleurothallidinae, whilst they occur in a different region (labelum) in the other major fly-pollinated orchid group (Bulbophyllum).
Abstract: Nectar and floral odor are frequently associated with the presence and maintenance of specialized pollination systems in Orchidaceae. We studied flowers of four Acianthera species, a genus of myophilous orchids belonging to the largest fly-pollinated orchid group Pleurothallidinae, in order to characterize the secretory structures related to their pollination mechanism. Flowers at anthesis were sampled to detect volatile compounds and nectar; samples were fixed for light microscopy and scanning and transmission electron microscopy. The labellum presents epidermal cells and the first mesophyll layer involved with secretory processes. Cellular characteristics of these regions associated with the occurrence of sugars allowed us to recognize them as nectaries. Some portions of the sepals also shown to be involved with secretory processes and the presence of nitrogenated volatile compounds characterize them as osmophores. The production of nectar in these species makes the occurrence of sapromyophily questionable, even though these flowers present characteristics of this floral syndrome. The presence of osmophores on the sepals reinforces that this localization is common among the Pleurothallidinae, whilst they occur in a different region (labelum) in the other major fly-pollinated orchid group (Bulbophyllum).
TL;DR: With the exception of the pantropical genera Bulbophyllum and Polystachya and the Paleotropical subtribe Coelogyninae, tilosomes are almost exclusively Neotropical phenomena.
Abstract: Tilosomes, also called "fibrous bodies" or "rod bodies" in older literature, are lignified excrescences from the walls of cells of the innermost velamen cell layer adjacent to thin-walled passage cells of the exodermis in roots of many epiphytic orchids. Seven broad morphological types are recognized: spongy, lamellate, discoid, webbed, meshed, baculate, and plaited. Some types characterize specific genera or subtribes of Orchidaceae. Of the 350 species in 175 genera included in a survey of the family, tilosomes occur in 95 species and 39 genera and are concentrated in tribe Polystachyeae and subtribes Sobraliinae, Coelogyninae, Laeliinae, Pleurothallidinae, Bulbophyllinae, Lycastinae, and Maxillariinae. With the exception of the pantropical genera Bulbophyllum and Polystachya and the Paleotropical subtribe Coelogyninae, tilosomes are almost exclusively Neotropical phenomena.
TL;DR: The aim of the floral anatomical investigation in Bulbophyllum wendlandianum (section Cirrhopetalum) was the detection of secretory activity, where the appendages of dorsal sepal and petals function as osmophores.
Abstract: The species from Bulbophyllinae are generally regarded as fly-pollinated: myophilous or sapromyophilous. The section Cirrhopetalum is characterized by umbellate inflorescence and elongated lateral sepals. The aim of the floral anatomical investigation (micromorphology, histochemistry, ultrastructure) in Bulbophyllum wendlandianum (section Cirrhopetalum) was the detection of secretory activity. The appendages of dorsal sepal and petals function as osmophores. The exudation is transported inside vesicles via granulocrine secretion. The cuticle stretches and forms swellings on the entire cell surface. Such swellings of cuticle on the appendages of dorsal sepal and petals were not previously described in Bulbophyllum species. The nectary is located in the central groove on the adaxial lip surface. It comprises epidermal epithelial cells and few subepidermal layers.