The moss, known as Ceratodon, was used to study how gravity affects cell organization.
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The moss, known as Ceratodon, were used to study how a spaceflight environment influences cell growth.
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Ceratodon purpureus, or the purple horn-tooth moss, one of the most common mosses in the United States, will grow well in relatively dry, compacted sites like terrace cracks.
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Examples would be " Rhytidiadelphus squarrosus ", a garden weed in Vancouver and Seattle areas; " Bryum argenteum ", the cosmopolitan sidewalk moss, and " Ceratodon purpureus ", red roof moss, another cosmopolitan species.