134 W or maid. — On the Occurrence in Britain of the 
Summary. 
1. A Sclerotinia found on mummified plums at Wye in March 1920 
has been shown, by cultural experiments in the laboratory and inoculations 
on fruit trees in the open, to be the apothecial stage of the grey Monilia 
commonly found on plums and cherries in Britain. 
2. The fungus, of which a description is given, is to be referred to 
Sclerotinia cinerea , (Bon.) Schroter. 
3. The dimensions of its asci and ascospores are, however, greater than 
those of the fungus described under that name by Aderhold and Ruhland ; 
on the other hand, its morphological characters are not inconsistent with those 
of Sclerotinia laxa as defined by them. 
Bibliography. 
1. Aderhold, R., and Ruhland, W. : Zur Kenntnisder Obstbaum-Sklerotinien. Arb. Biol. Abt. 
• im Land- u. Forstw. Kaiserl. Gesundheitsamte, Bd. iv, 1905, pp. 427-42. 
2. Bartram, H. E. : A Study of the Brown Rot Fungus in Northern Vermont. Phytopath., 
vol. vi, 1916, pp. 71-8. 
3. Dandeno, J. B. : Winter Stage of Sclerotinia fructigena . Rept. Mich. Acad. Sci., vol. x, 1908, 
PP- 5i-3. 
4. Matheny, W. A. : A Comparison of the American Brown Rot Fungus with Sclerotinia fructi- 
gena and S. cinerea of Europe. Bot. Gaz., vol. lvi, 1913, pp. 418-32. 
5. Norton, J. B. S. : Sclerotinia fructigena. Trans. Acad. Sci. St. Louis, vol. xii, 1902, pp. 91-7. 
6 Pollock, J. B. : Notes on Plant Pathology, nth Rept. Mich. Acad. Sci., 1909, pp. 51-4. 
7. Reade, J. M. : Preliminary Notes on some Species of Sclerotinia. Annales Mycol., vi, 1908, 
pp. 109-15. 
8. Schroter, C. : Kryptogamen-Flora von Schlesien. Bd. iii, Pilze, p. 67. 1893. 
9. Westerdijk, Joh. : Die Sclerotinia der Kirsche. Meded. phytopath. Lab. ‘ Willie Commelin 
Scholten’, Amsterdam, Bd. iii, 1912, pp. 39-41. 
10. Wormald, H. : The ‘Brown Rot’ Diseases of Fruit Trees, with special reference to Two 
Biologic Forms of Monilia cineria , Bon. Ann. of Bot., vol. xxxiii, No. i3i,July, 1919, 
pp. 361-404, and vol. xxxiv, No. 134, April, 1920, pp. 143-71. 
11. Woronin, M. : Uber die Sclerotienkrankheit der Vaccinien-Beeren. Mem. Acad. Imp. Sci. 
St. Petersbourg, ser. xxxvi, No. 6, 1888. 
EXPLANATION OF PLATES VI AND VII. 
Illustrating' Mr. H. Wormald’s paper on the Occurrence in Britain of the Ascigenous Stage of 
a ‘Brown Rot’ Fungus. 1 
PLATE VI. 
Fig. 1. Two mummified plums bearing spoTophores of Sclerotinia cinerea. Nat. size. 
Fig. 2. Isolated sporophores. 
Fig. 3. Four sporophores in situ . x 2§. The uppermost one bears rhizoids at the base of the 1 
stipes. 
