A single-celled green alga Shunan Cao & Qiming Zhou, , isolated from a specimen of Antarctic lichen (Vahl) Gray, is described and illustrated based on a comprehensive investigation of morphology, ultrastructure, ecology and phylogeny. The cells of are ovoid to long ellipsoidal and measured 3-5 µm × 6-12 µm. The new species has distinct ITS rDNA and SSU rDNA sequences and differs from the phylogenetic closely related species , and in cell size, distribution and habitat.
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