Phylum Hepatophyta

Phylum Hepatophyta (HEP-uh-TAHF-uh-tuh) includes the liverworts, unusual-looking plants that grow in moist, shady areas. Most liverworts have thin, transparent leaflike structures arranged along a stemlike axis, as shown on the left side of Figure 28-6. Some liverworts have a thalloid (THAL-oyd) form—that is, a flat body with distinguishable upper and lower surfaces, as shown on the right side of Figure 28-6. All liverworts lie close to the ground. This adaptation allows them to absorb water readily. In some species, the gametophyte is topped by an umbrella-shaped structure that holds the reproductive cells.

figure 28-6

A leafy liverwort (a) has two rows of leaflike structures growing on a stem. A thalloid liverwort (b) has very flat, thin lobes.

figure 28-6

A leafy liverwort (a) has two rows of leaflike structures growing on a stem. A thalloid liverwort (b) has very flat, thin lobes.

(a)
figure 28-7

Hornworts grow in warm, moist habitats, such as along roads or near streams.

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