Dodge: Life History of Ascobolus magnificus 119 



The form which the ascogoniutn takes as it develops depends 

 greatly upon the position of the antheridium. Cases are illus- 

 trated in Text fig. 6 and in PL 7, fig. 6, in which the ascogonium 

 becomes spirally coiled about the antheridium. In the latter 

 figure the end of the trichogyne is plainly visible as it coils about 

 the end of the antheridium. The type shown in PL 7, figs. 5, 8, 

 is very common and fig. 10 shows another fairly common type in 

 which the trichogyne makes a wide sweeping coil and the end runs 

 upward along the antheridium (Text figs. 12, 14). Text fig. 15 

 shows a form in which the ascogenous hyphae have grown out to 

 a considerable length before a single sterile hypha has appeared 

 from the stalk of the ascogonium. The antheridium arises from 

 the hypha crossing beneath from an oblique angle so that it is not 

 shown in the figure. A rather complicated system is shown in 

 Text fig. II, in which it is difficult to determine the origin of 

 the antheridium, and the trichogyne seems to be unnecessarily 

 long. The antheridium is frequently quite a distance away and 

 it may be that there is an inherent tendency to develop a long 

 trichogyne even in cases where the antheridium grows nearby. In 

 the specimens illustrated in Text fig. 10 the antheridium is really 

 at some distance from the ascogonium, but the preparation was 

 crushed down with a cover glass so that the ascogonium fell over 

 on the antheridium as it always does in mounting the primordia. 

 The camera lucida drawings reproduced in the text were made 

 eight years ago from material preserved for a time in glycerine 

 and then mounted in glycerine jelly. These preparations are 

 very transparent, flattened out and distorted, still the essential 

 features can be made out. Better preparations were made this 



Text Figs. i-ii. i. A single two-celled primordium. 2. A group of three 

 structures, two of which may pair up. 3. A typical pair of primordia, both 

 curved, one lying slightly above the other. 4. The ascogonium arises from the 

 end cell of a hypha and curves over the antheridium. 5. Trichogyne begin- 

 ning to coil about the antheridium, the ascogenous cell not yet differentiated ; 

 sterile hyphae are growing out of the stalks of the primordia. 6. Spiral archi- 

 carp. Compare with fig. 6 in Plate 7. 7. Fertilization has taken place ; the 

 ascogenous cell is differentiated. 8. Outgrowth of sterile hyphae from the 

 base of the archicarp. 9. The most common type of primordia. 10. Ascogenous 

 hyphae beginning to grow out. These primordia are exceptionally long-stalked. 

 11, Complicated coil with a long trichogyne. 



