Consider the following statements.

(I) The plants have magnificant property of retaining water. They can withhold water two hundred times more than their own weight. Hence, they are widely used by gardeners to keep cut plant parts moist during transportation and opagation.

(II) They grow as semiaquatic or submerged plants in acidic marshes. The older portions of plants die, but do not decay due to peculiar germicidal properties. The above statements belong to which of the following bryophytic plant?