Wor maid.— Brown Rot ’ Diseases of Fruit Trees . II. 171 . 
26. Woods, A. F. : The Destruction of Chlorophyll by Oxidizing Enzymes. Cent. f. Bakt., Abt 2, 
Bd. v, 1899, pp. 745-54. 
27. Woronin, M. : Uber Sclerotinia cinerea und Sclerotinia fructigena. Mem. Acad Imp. Sci. 
Saint-Petersbourg, viii Ser., vol. x, No. 5, Phys. Math., 1900, pp. 1-38. 
28. WORMALD, H. : A Blossom Wilt and Canker of Apple Trees. Ann. Applied Biol., vol. iii, 
No. 4, Apr. 1917, pp. 159-204. 
29 : A ‘Wither Tip ’ of Plum Trees. Ann. Applied Biol., vol. v, No. 1, July, 
1918, pp. 28-58. 
30. *• : The ‘ Brown Rot ’ Diseases of Fruit Trees, with Special Reference to two 
Biologic Forms of Monilia cinerea , Bon. I. Ann. of Bot., vol. xxxiii,No. 131, July, 1919, 
pp. 361-404. (Bibliography of literature on Brown Rot Diseases, pp. 398-403.) 
EXPLANATION OF PLATES IV AND V. 
Illustrating Mr. Wormald’s paper on the ‘Brown Rot ’ Diseases of Fruit-trees. II. 
Fig. 1. Plums affected by Brown Rot caused by Monilia cinerea , showing — 
(a) infection arising from contagion ; 
( b ) the small grey pustules typical of the fungus when growing on recently infected fruit. 
Fig. 2. The winter condition of plums infected with M. cinerea ; the redeveloping pustules are 
larger than those produced in summer. 
Fig- 3. The winter condition of plums infected with M. fructigena ; the pale pustules are 
smooth (non-pulverulent) and barren ; the darker pustules below and on the left are covered with 
a brown hyphomycete. 
\ Cultures of the same age grown simultaneously under 
the same conditions, i.e. on prune juice agar at room 
temperature (about 16 0 C.). The granular appearance 
in Fig. 7 is due to innumerable tufts of conidiophores 
with chains of conidia. 
The relative colour reactions with guaiacum shown by three extracts, similarly prepared , 
from the tissues of one and the same apple which had been artificially inoculated with two strains of 
M. cinerea : 
Fig. 4. 
Fig- 5- 
Fig. 6. 
Fig. 7- 
Fig. 8. 
M. cinerea f. mali 
M. cinerea i.pruni 
M. fructigena 
American strain of Monilia 
A. From side infected with M. cinerea f. mali. 
B. ,, ,, „ ,, M. cinerea f. pruni. 
C. From that portion of the apple which had not become infected. 
