A STONEWORT. 19 
9. Do the internodal cells unite at the nodes or are 
there nodal cells. 
10. Of how many cells do the elongated branchlets of 
the dwarf branches consist? 
11. Make a careful drawing of the plant, showing all 
the parts and observations already made. 
B. Reproductive Stage. 
1. With m. or l.p. observe. the form and color of the 
fruiting structures, a spherical one (spermary), and 
a somewhat flask-shaped organ (ovary). Where 
are they situated? 
2. Observe the relative position of the spermary and 
ovary. What significance may this arrangement 
have? 
8. Study the spermary with l.p. and observe the large 
cells (shields) that make up its wall. How are 
they arranged? Sketch. 
4. Crush a spermary and study its contents. Observe 
the tangled threads (spermatic filaments) some- 
times with small lash-like cells within (male gam- 
etes). Sketch filaments. 
5. Study the ovary and observe the details of struc- 
ture. 
6. The inclosed large cell is an egg (female gamete). 
The protective cells which cover it are cortical 
cells. How are they arranged and how do they 
terminate? Sketch and designate all parts. 
C. Life Problems. 
1. Where does this plant grow? 
2. Is it free or attached ? 
3. Is the plant body a flattened thallus? 
