108 
OHIO BIOLOGICAL SURVEY 
EXPLANATION OF PLATES 
EXPLANATION OF PLATE I. 
Note: Where no magnifications are given an enlargement of 79 diameters for perithecia, and 450 diame¬ 
ters for hairs, paraphyses, asci, and spores is to be understood. The illustrations were drawn from a 
magnification double that given here and reduced one-half in the process of reproduction. 
1-8. Chaetomium murorum. 1-2. Two kinds of apical hairs. 3. Upper half of 
a lateral hair. 4-6. Young asci in outline. 7. Spore-bearing part of a mature 
ascus. 8. A spore. 
9-11. Chaetomium olivaceum. 9. A young ascus. 10. Spore-bearing part of a 
mature ascus. 11. Slightly immature spores. 
12-20. Chaetomium spirochaete. 12. Perithecium. 13. Apical hair. 14. Portion 
of a different kind of apical hair. 15, 16. Lateral hairs. 17, 18. Basal 
hairs. 19. Immature ascus. 20. Spores showing oil globules in some. 
21-22. Chaetomium bostrychodes. 21. Perithecium. 22. A portion of the 
perithecial wall showing structure. 
