late spring in yellowstone national park: green streamers of cyanidium in the pinwheel geyser runoff near whirligig geyser in the

algae area background basin cyanidium environment feature geothermal geyser green hot hydrothermal landscape late mat microbes national natural nature norris nps outdoor outdoors park pinwheel porcelain rock runoff scenic spring springtime streamers thermal thermophiles thermophilic tourism travel view volcano water whirligig wyoming yellowstone