62 
Ohio Biological Survey 
many-celled, cells nearly isodiametrical; trichogynes not seen; sperma- 
gonia submarginal, horizontal diameter 60 to 135 mic., vertical diameter 
70 to 120 mic.; spermatia 2.6 to 5 mic. long and 0.75 to 1 mic. wide. 
Note. Only spermagonia which reached nearly to the surface and 
contained spermatia were measured. However, some of the sections 
may not have passed through the center of the spermagonium. This 
doubtless makes some of the minimum measurements too small. 
LIST OF THE TITLES CITED. 
1. Bachman, Freda M. A new type of spermagonium and fertilization in 
Collcina- Ann. Bot. 24 : 747-760. pi. 49. 1912. 
2. Bachman, Freda M. The origin and development of the apothecium in 
Collcma piilposiiin (Bern.).Ach. Archiv. Zellforsch. 10 : 369-430. pi. 30-36. 
1913. 
3. Bary, A. de. Morphologie imd Physiologie der Pilze, Flechten, und 
Myxomyceten. 1-316. f. 1-100. Leipzig, 1866. 
4. Baur, Erwin. Zur Frage nach der Sexualitat der Collemaceen. Ber. 
Deutsch. Bot. Ges. i 6 '- 363-367. pi. 23. 1898. 
5. Lindau, G. Beitrage zur Kenntniss der Gattung GyropJiora- Festschrift 
Schwendener 19-36. pi. 2. Berlin, Gebriider Borntraeger, 1899. 
6. Schwendener, S. Die Algentypen der Flechtengonidien. 1-42. pi. 1-3. 
Basel, C. Schultze, 1869. 
7. Stahl, C. E. Beitrage zur Entwickelungsgeschichte der Flechten. I. 
Ueber die geschlechtliche Fortpflanzung der Collemaceen. 1-55. pi. 1-4, 
Leipzig, Arthur Felix, 1877, 
8. Sturgis, W. C. On the carpologic structure and development of the 
Collcmaccac and allied groups. Proc. Am. Acad, 2 ^: 15:52, pi. 1-8. 1890. 
