Jun 22, A study called for better understanding of potential effects on the climate of red algae that grows on snow in warmer months. Feb 2, By @yaminahglow: "Watermelon snow, also called snow algae, red snow, or blood snow, is Chlamydomonas nivalis, a species of green algae. Jul 11, In general, most algae is considered edible. Even the faint watermelon-like scent of snow algae might give that impression. The author of this.