30 
STUDIES OF PLANT LIFE. 
7. Make drawings showing (a) the distribution of the 
sori, (6) a sporangium with its pedicel showing 
details of structure, and (c) the spores. 
B. The Gametophyte. 
1. 
Study the form and structure of a prothallium (game- 
tophyte) (the plant body grown from the fern 
spore). Are rhizoids present? If so, where? 
Possibly small, spherical antheridia (spermaries) 
may be found with l.p. among the rhizoids, also 
rather elongated archegonia (ovaries) nearer the 
notch (sinus). 
2. If possible, show all these structures in a careful 
Cc. 
freee. hours 
drawing of the gametophyte. 
Life Problems. 
Where are the root, stem, and leaf portions? Why ? 
Does it live more than one year? Why? 
How is it distributed ? 
Under what conditions do ferns grow best? 
Have ferns been more successful in former times 
than at present? Why? 
Ts it of any advantage for the fern to have its game- 
tophyte separate from the sporophyte? Why? 
In spite of so large a production of spores why are 
ferns not more numerous? 
