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- W1978192603 abstract "Stamen morphology is shown to vary considerably in Nothofagus. All species in subgenus Brassospora have heteromorphic, striated epidermal papillae on their anthers. The absence of similar epidermal papillae in other subgenera in Nothofagus or in the putative sister taxa Fagaceae or Betulaceae would suggest that heteromorphic papillae is a derived feature in Brassospora. The anthers of the New Guinean taxa are heteromorphic in size, degree of connation, surface ornamentation, and in the variable position of papillae. This variation permits recognition of a number of informal subgroups in the New Guinean species of Brassospora. The anthers of all the New Caledonian species are large to very large in size and have a similar ornamentation, which differs from that in the New Guinean species. All Brassospora species also have connate stamen filaments, which is a possible synapomorphy for the subgenus, which does not occur in the other three subgenera, or in the Fagaceae and Betulaceae. Rounded isomorphic papillae occur on the epidermal cells of the stamens in three species of subgenus Lophozonia; N. nervosa and N obliqua from South America, and N. moorei from Australia. The absence of this type of papillae from other species in Lophozonia and other subgenera in Nothofagus and putative outgroups would suggest that single papilla is a derived feature in this subgenus. The similar anther ornamentation in N. obliqua and N. nervosa, i.e, solitary papillae with basal striations, suggests that they are sister taxa. Nothofagus moorei also has solitary papillae but lacks the basal striations seen in the South American taxa. This taxon is either sister to the South American species, or, alternatively, single papillae have arisen independently in these two groups in Lophozonia. The variation in stamen morphology in Nothofagus allows for the recognition of a number of anther and filament characters that appear to be of phylogenetic significance." @default.
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- W1978192603 date "1998-07-01" @default.
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- W1978192603 title "Stamen Morphology in Nothofagus (Nothofagaceae)" @default.
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- W1978192603 doi "https://doi.org/10.1086/297584" @default.
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