Flowerless plants; ferns, mushrooms, mosses, lichens, and seaweeds

SEAWEEDS
is paler and thinner than that of the widest ulva.
When young the sea lettuce is said to form an in-
flated bag, somewhat like a small toy balloon. Later,
this splits along the side and floats out, making a thin
leaf of but one layer of cells. This plant is not quite
so common as the larger one.
The ulva is one of the seaweeds that lives but a
year. It is often found on the beach in the winter,
but it is most abundant during the spring and summer
months.
FUCUS, OR ROCKWEED
The rockweeds are said to make up about one-half
of our seaweeds. They are of different kinds. Three
are found on our Atlantic coast, and one is common
on the Pacific coast.
The plants are large, tough, and leathery. When
fresh, they have a distinct olive-green color, but they
become almost black when dry. They grow in thick
bunches, attached to the rocks by cone-shaped disks
or holdfasts. When the tide goes out they hang from
the rocks like long fringe. When it rises again, they
float and sway in the water like huge bouquets. Some-
times the spore cases are scattered over the entire
frond. In other plants they are found at the ends
of the branches.
The rockweed that is the most common is called
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