172 
BASCOMBE BRITT HIGGINS 
Fig. 14. Section of leaf of Prunus virginiana showing amphigenous nature of 
Cylindrosporium acervuli and the separation of the diseased spot. X 47. 
Fig. 15. Portion of section similar to fig. 14 more highly magnified showing 
the enlarged cells of separation layer and walls of ruptured cells. X 450. 
Fig. 16. Later stage, showing the suberized layer (the cell walls of which are 
represented by heavier lines) and the remains of the enlarged cells now dead. X 450. 
Fig. 17, Young haustoria, showing nuclei and vacuoles, in cells of bundle 
sheath in leaves of Prunus virginiana. 
Fig. 18. Haustoria in mesophyll cell of the same leaf surrounded by cellulose 
sheaths. 
Fig. 19. Developing ascocarp of Coccomyces lutescens in leaf of P. virginiana, 
showing the subepidermal position with remains of the gelatinized conidiophores and 
the early appearance of the paraphyses. X 250. 
Fig. 20. Mature ascocarp of same with asci and paraphyses. X 250. 
Fig. 21. Developing ascocarp of Coccomyces lutescens on Prunus serotina 
still covered by host epidermis. X 250. 
Fig. 22. Mature ascocarp of same. X 250. 
Plate XVI 
Fig. 23. Asci and single paraphysis of Coccomyces hiemalis from Prunus 
avium. X 450. 
Fig. 24. Ascospores of same more highly magnified. X 625. 
Fig. 25. Ascospores of same germinating in an agar culture five days old. 
Fig. 26. Asci and paraphyses of Coccomyces hiemalis from Prunus pennsyl- 
vanica, spores are mature in one 'on left. X 450, 
Fig. 27. Conidia (Cylindrosporium) of Coccomyces hiemalis on Prunus penn- 
sylvanica. X 450. 
Fig. 28. Asci and paraphysis of Coccomyces hiemalis on Prunus cerasus. 
The spores have been shed from one of the asci, and are scarcely mature in other. 
X 450. 
Fig. 29. Germinating conidia (Cylindrosporium) of Coccomyces hiemalis. 
X 450. 
Fig. 30. Microconidia (spermatia ?) and microconidiophores of Coccomyces 
hiemalis from P. avium. X 450. 
Fig. 31. Apothecial conidia of Coccomyces hiemalis on P. avium. X 450. 
Fig. 32. Same germinating after two days in water culture. 
Fig. 33. Asci and paraphyses of Coccomyces prunophorae from P. domestica. 
X 450. 
Fig. 34. Ascospores from same more highly magnified. X 650. 
Fig. 35. Apothecial conidia of Coccomyces prunophorae. X 450. 
Fig. 36. Conidia (Cylindrosporium) of Coccomyces prunophorae. X 450. 
Fig. 37. Ascus of Coccomyces lutescens from Prunus mahaleb. 
. Fig. 38. Ascospores of same more highly magnified. X 625. 
Fig. 39. Microconidia and microconidiophores of Coccomyces lutescens. 
X 450. 
