GROUP II. BRYOPHYTES. MOSS PLANTS. 
STUDY 11. 
A LIVERWORT. Marchantia. 
A. The Vegetative Portion. 
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From the general appearance of this plant can it be 
determined where and under what conditions it 
grows? 
The plant body is a thallus and consists of a central 
median line structure (midrib) with a lateral 
expansion (wing) on each side. 
Note the number of branches of the main axis and 
the plane of branching. 
Study the rhizoids. On which surface are they? 
To what are they attached? How do they differ 
(.p.)? Do they branch? Of how many cells 
are they composed? What is their purpose ? 
Sketch. 
Study carefully with m. the upper surface to find 
numerous breathing pores (stomates), each of 
which is in the center of a small stomate area. 
What is the form of the stomate areas? Sketch 
four or more adjacent typical ones, showing their 
stomates. Why does the plant need to breathe? 
Are there any stomates on the under surface ? 
Why? 
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