Summary Hormidium Kützing 1843 (non Lindley ex Heynhold 1840, Orchidaceae) is shown to have been lectotypified with H. velutinum , a schizogoniaceous alga. Hormidium sensu Klebs 1896 comprises ulotrichaceous algae. Although intended to apply to ulotrichaceous algae, Chlorhormidium Fott 1960 can be associated only with schizogoniaceous algae inasmuch as the name was proposed as a substitute for Hormidium Kützing. Klebs's concept of Hormidium is therefore described as a new genus, for which the name Klebsormidium is proposed.
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Silva et al. (1972) studied this question.