Characium marinum is a species of green algae (Chlorophyta). Description Characium marinum is a microscopic unicellular elongated oval algae growing attached epiphytically by a stalk various algae. The single chloroplast is parietal with a single pyrenoid. Ecology Epiphytic on other marine algae. and eastern Canada Distribution Recorded from Svalbard (Norway), Sweden, once in Ireland County Down, twice in Great Britain, under-recorded. and eastern Canada. References External links Characium marinum, AlgaeBase Sphaeropleales Plants described in 1883