394 BOTANICAL GAZETTE [JUNE 
appeared numerous black sclerotia, ranging in size from that of a 
grain of sand up to a small bean. From such sclerotia a Peziza 
form was obtained, which is shown, copied from Smith’s figure, 
in fig. 37. The form was described by Berkeley and Wilson (3b) 
as a new species, under the name Peziza postuma. De Bary (5), 
however, to whom the material was sent, determined the fungus 
as Sclerotinia Libertiana. Pesiza postuma is also given by Rehm 
(Io, p. 816) as a synonym of S. Libertiana. In each of these 
cases the disease appears to have been caused by Botrytis or 
Sclerotinia alone, and no reason appears for claiming a connec- 
tion between them. 
CUCUMBER DISEASE, 
BIBLIOGRAPHY. 
1. HUMPHREY, J. E. Diseases of the cucumber plant. A sclerotium disease. 
Rept. Mass. Exp. Sta. 10: 212, 1893. 
2. COOKE, M.C. Cucumber diseases. Gard. Chron. III. 14: 137. 1893. 
The disease described by Humphrey (1) under the name of 
“timber rot” is not uncommon in cucumber houses in Massa- 
chusetts. The writer has met with it several times and also has 
received specimens from the New York Exp. Sta. at Geneva. 
Cooke (2) notes the occurrence of apparently the samé trouble 
in England. The disease is characterized by a dry rot of the 
stem with a production of mycelium and sclerotia upon the sur- 
face. From the sclerotia Sclerotinia Libertiana réadily develops. 
The writer has found no conidial form in connection with the 
disease. Humphrey, however, finding Botrytis on a decaying 
fruit, argues a connection between the forms. He obtained 
sclerotia in cultures from conidia which are stated to have shown 
complete identity in microscopic structure with sclerotia devel- 
oped from the ascospores of the Sclerotinia. The form and 
manner of growth of the sclerotia were not the same, but this 
difference was ascribed to the nature of the substratum. 
Humphrey’s results have been repeatedly duplicated by the 
writer. It is true that Botrytis is often found on rotten cucum- 
bers, and also that in cultures from conidia sclerotia may be 
