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Photosymbiont of Cladonia foliacea, compare https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8282589/
Asterochloris algea is the primary photobiont algea for Cladonia sp lichens. I found this algea in a Cladonia, therefore it is probably Asterochloris sp.
Here it is at x2000 magnification.
Periphyton from an intermediate swamp; pH = 6.5.
Collected from B.B. Clark Beach on Lake Monona, 7/9/2024. Along the edge of the water during a slight algal bloom.
L: 50 (64 with spines), W: 50 (69), I: 15 um
no obvious facial ornamentation