Abstract
The sub-cellular protuberances from the inner tegmen layer have been given various names in earlier literature. Here named ‘endotegmen tuberculae’, they vary in shape, size and density of distribution in the endotegmen of different taxa. These characteristics make them useful for taxonomic research at both genus and species level. Their shape is a major consideration in transferring Hydrocharis dubia to the genus Limnobium. A further structure, ‘exotegmen tuberculae’, has been observed for the first time. This paper gives a survey of these structures and illustrates their taxonomic importance and its implications.
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