132 
Wormald . — On the Occurrence in Britain of the 
Author. 
Fungus. 
Asci. 
Ascospores. 
Norton 
S. fructigena 
45-60 x 3-4 
6-7 x 3-3-5 
Reade 
S. fructigena 
125-215 x 7-10 
10-15x5-8. 
Pollock 
S. fructigena 
130-179x9.2-11.5 
11.4-14.4x5-7 
Mathe^r 
S. cinerea 
From apothecia on peaches 
135-190x6.9-10.5 
Mostly 163 x 8.9 
From apothecia on plums 
1 35— 1 73 x 6.8-10.8 
Mostly 15 1 x 9-4 
10.5-14-5 x 5. 2-7.5 
Mostly 1 2.5 x 6 
9.3-14.2 x 5-7.4 
Mostly 1 1-8 x 6.3 
Bartram 
S. cinerea 
Average 150-4 x 8-8 
Average io-i x 7.1 
Aderhold and 
S. fructigena 
1 20-0-180.0 x 9.0-1 2.0 
1 1.0-12.5 x 5-6-6. 8 
Ruhland 
S. laxa 
1 2 r. 5-149.9 x 8.5-1 1.8 
I3C *5- T 3*5 x 5-2-6-9 
S. cinerea 
89.3-107-6 x 5.9-6. 8 
6-2- 9-3X3-I-4-6 
Westerdijk 
Sclerotinia on 
cherries 
158.4-171.6 x 7*9-8*5 
13.2-16.8 X4-3-5-2 
The Sclerotinia found on plums 
Asci with monostichous spores 
at Wye 
j 24-188 x 7-5-10.5 
Average 153.4 X8.7 
Asci with distichous spores 
162-226 x 10-13-5 
Average 192 x 11*25 
7-19 x 4.5-8. 5 
Average 1 2-5 x 6-2 
With regard to the foregoing nomenclature and dimensions the 
following points are to be observed. As already mentioned, Aderhold and 
Ruhland established the connexion between the apothecial form they named 
Sclerotinia fructigena and the conidial* form Monilia fructigena ^ Pers. ; the 
ascospores of this fungus are described and figured as having pointed ends 
(‘ sporideis . . . ovato-fusoideis, utrinque acutis ’). For their description of 
vS. cinerea they used preserved material sent by Norton, and found that the 
ascospores had rounded ends ; Reade examined fresh apothecia also 
obtained from Norton. It seems certain, therefore, that the earlier records 
of the Sclerotinia in America were not of S. fructigena, (Pers.) Schroter, and 
the more recent records show that the American form is one of which the 
conidial fructifications are indistinguishable from those of Monilia cinerea , 
Bon. It is to be noted that Reade’s figures are higher than those of either 
Norton or Aderhold and Ruhland, and are of the same order as those 
obtained by Pollock, Matheny, and Bartram. Of thirteen strains of Monilia 
obtained by the present writer from various sources in North America, each 
has proved to be a fungus with a Monilia stage* very similar to the grey 
Monilia common in Britain, but differing from the latter in its mode of 
growth when growing on agar, and in its more copious development of 
conidia when cultivated on artificially prepared culture media, while strains 
of Monilia isolated from mummied plums obtained from France and Holland 
have proved to be culturally similar to the form occurring in Britain. The 
American Sclerotinia would appear therefore to be either a distinct species 
or at least a form culturally distinct from the European Monilia cinerea , Bon. 
There remain for consideration Aderhold and Ruhland’s Sclerotinia 
laxa and Westerdijk’s Sclerotinia on cherries; the asci and spores of the 
latter are greater than those found on N. laxa , but it will be seen that both 
