EXPLANATION OF PLATE I—(Continued). 
RHYTISMA LINEARE Peck. 
Page 100. 
Fig. 24. <A pine leaf bearing the Rhytisma along the midvein. 
Fig. 25. An ascus containing spores x 400. 
Fig. 26. Two spores, one involved in mucus, x 400. 
DIATRYPE (DIATRYPELLA) BETULINA Peck. 
Page 101. 
Fig. 27. A piece of a branch bearing the Diatrype, the bark and two stromata 
having been removed from one end. 
Fig. 28. A stroma magnified. 
Fig. 29. Vertical section of the same showing four included perithecia. 
Fig. 30. An ascus magnified. 
Fig. 31. Four spores more highly magnified. 
