Cyanidium caldarium Geitler, Cyanidioschyzon merolae De Luca, Taddei & Varano and Galdieria sulphuraria (Galdieri) Merola are the three thermoacidophilic algae characterized by a chloroplast which is bounded by a single membrane. The presence of this atypical chloroplast made the inclusion of these algae in the Rhodophyta difficult. The discovery in the three algae of floridoside and isofloridoside, typical storage products of red algae, in compatible with their inclusion in the Rhodophyta
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Luca et al. (1983) studied this question.
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