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Lesueuria minderiana, a new genus and species of nongeniculate Corallinaceae (Rhodophyta) from southern and western Australia, consists of branched endophytic filaments which form a partly pseudoparenchymatous, partly filamentous thallus within the geniculae of the only known host, Metagoniolithon chara. Cell fusions occur between cells of contiguous filaments, secondary pit-connections are absent, and haustoria have been observed. Heavily calcified uniporate conceptacles develop external to the host. Tetrasporangia lack apical plugs and are produced on the conceptacle chamber floor peripheral to a central, sterile columella. Conceptacle roofs are formed from a group of peripheral filaments which surround and enclose the conceptacle chamber. Lesueuria is referable to the Mastophoroideae and is distinguished from other genera of that subfamily by its semi-endophytic habit, and possibly parasitic nutrition, by the absence of organized vegetative tissues and by the lack of epithallial cells on vegetative filaments. Its relationships to other semi-endophytic and parasitic genera of nongeniculate Corallinaceae, none of which belong to the Mastophoroideae, are also considered.
Woelkerling et al. (Mon,) studied this question.