You beg the question, I think, in saying that Protococcus would be doomed to eternal similarity.
"More Letters of Charles Darwin" by Charles Darwin
On several patches of the snow I found the Protococcus nivalis, or red snow, so well known from the accounts of Arctic navigators.
"A Naturalist's Voyage Round the World" by Charles Darwin
Mine host with whom I lodged had a microscopical mount of the Protococcus nivalis in excellent state of preservation.
"Scientific American Supplement, No. 385, May 19, 1883" by Various
Where the ordinary plants cease to exist the snowy protococcus holds undisputed sway on the extensive snow fields.
"The Mountain that was 'God'" by John H. Williams
PROTOCOCCUS FROM SLIDES EXPOSED OVER SWAMP-MUD .
"A System of Practical Medicine by American Authors, Vol. I" by Various