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Kalkbohrende Mikrothalli beiHelminthocladia undScinaia (Nemaliales, Rhodophyta)

Abstract

Shell-boring microthalli in Helminthocladia and Scinaia (Nemaliales, Rhodophyta). Spores shed from pink mussel shells were shown to develop into branched monosiphonous thalli, their filaments penetrating into shell fragments. Isolates from four single germlings were cultivated. Two of these produced gametophytes ofHelminthocladia andScinaia; the others have so far only reproduced by tetraspores or monospores. Evidently the microthalli of some genera of the Nemaliales — which are, with the exception ofNemalion multifidum, known only from cultures — are shell-inhabiting and have therefore not been found in nature. The adult algae occur mainly on shells and CaCO3 substrates. Until the beginning of the century,Helminthocladia andScinaia frequently occurred at Helgoland, but they have not been found there for more than 50 years. Their microthalli, however, are still present as shell-boring algae. This study is intended to stimulate similar ones in other genera of the Nemaliales so as to obtain a broader basis for discussion of systematic and phylogenetic relationships.

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Kornmann, P., Sahling, P.H. Kalkbohrende Mikrothalli beiHelminthocladia undScinaia (Nemaliales, Rhodophyta). Helgolander Meeresunters 34, 31–40 (1980). https://doi.org/10.1007/BF01983539

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  • DOI: https://doi.org/10.1007/BF01983539