An Overview of the Bryophytes (Nonvascular Plants) Help
Bryophytes (Nonvascular Plants) Overview
The two most familiar types of bryophytes are the mosses and the liverworts ( LIV -er-werts). The word, moss, descends from the Old English for “bog” – a marsh or swamp consisting of soft, wet, spongy ground. A moss is a very small, soft, brown or green plant that grows closely together with others of its kind, forming a living carpet on rocks, trees, or ground. Mosses have short stems and many slender leaves. Decaying sphagnum ( SFAG -num) moss (also called peat moss ) is especially common in bogs. Peat ( PEET ) is heavy turf made of tightly packed mounds of partially rotted sphagnum (peat moss) and various other plants. Peat is used as a fertilizer and is commonly burned as fuel in Scotland, Ireland, and England, where there are many peat-containing bogs.
Liverworts are given two alternate names – liverleaf and hepatica (hih- PAT -uh-kuh). In humans and animals, the shorter word, hepatic (hih- PAT -ik), literally “pertains to” (-ic) the “liver” (hepat). Obviously, the words, liverwort and liverleaf, actually contain the smaller word, liver, while hepatica contains the Latin word for liver. A glance at Figure 9.3 will reveal the reason. The liverwort (liverleaf, hepatica) is a low-lying plant with brownish-green, three-lobed leaves that resemble the human liver, which also has a number of lobes. The resemblance of the hepatica plant leaves to the liver, created the ancient belief that eating this plant cures jaundice ( JAWN -dis) and a number of other liver diseases!
Living Habits And Reproduction Of The Bryophytes
Because both mosses and liverworts are bryophytes (nonvascular plants), they can live only in free-standing pools of water. Having no vascular (vessel-bearing) system or roots to transport fluid, nutrients, and waste products, they must grow upon pools of water (however tiny and shallow). Such a tiny pool might even occur in a shadowy cleft on the sun-baked face of a desert rock. A pool even this small may be just enough to allow the bryophyte plant to absorb water and nutrients into its nonvascular tissues, and survive.
A water pool is also needed as a fluid medium, so that sperm cells can travel from the male bryophyte plants and fertilize the female plants.
Practice problems for these concepts can be found at: Plant Test