362 
OHIO BIOLOGICAL SURVEY 
EXPLANATION OF PLATE XV 
Fig. 5. A section through the cortex of Peltigera canina, showing its relation to the 
medullary hyphae. X 760. 
Fig. 6. A portion of a section of the hymenium of Peltigera canina, showing two asci 
containing spores, two asci with protoplasmic contents, and five paraphyses. 
X 760. 
Fig. 7. A portion of a section through an apothecium of Peltigera canina, showing 
part of the hymenium of interwoven hyphae below and the bases of three 
paraphyses above. X 760. 
Fig. 8. Types of spores found in the Peltigeraceae: a, 4-celled spores of Peltigera 
horizontalis; b, 6- to 8-celled spores of Peltigera sorediata; c, 4-celled spores 
of Peltigera aphthoisa; d, 4- to 8-celled spores of Peltigera canina. X 380. 
The drawings were made with camera lucida and were reduced one-half in making the plates. 
