Revision of Cyanidium caldarium. Three species of acidophilic algae

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Abstract
The authors carry out a systematic revision of three unicellular eucaryotic algae, often living in mixed population in thermal acidic environment. Such algae were often confused under the binomium Cyanidium caldarium. The authors state that the following specific binomia are to be attributed to the three algae: Galdieria sulphuraria (Galdieri) Merola comb. nova; Cyanidium caldarium Geitler non (Tilden) Geitler emend.; Cyanidioschyzon merolae De Luca, Taddei & Varano. The family Galdieriaceae is instituted for the first of these algae, whereas the other two algae are included in the family Cyanidiaceae Geitler emend. The class Cyanidiophyceae Merola, a new class of the Rhodophyta, is instituted for these two families.