Pammel — Sclerotinia Libertiana. 198 
cessful cultures of the fungus on prune gelatin, and sterilized 
bread saturated with an infusion of prunes. He has confirmed 
DeBary’s work in regard to the mode of infection of the 
plant. Humphrey shows that when a cucumber plant is 
injured, and spores placed in the cut, infection does not occur, 
but if they are sown in nutrient media on a healthy and unin- 
jured plant infection is easy, and the fungus quickly spreads 
through the tissues. 
Humphrey has also shown that a species of Botrytis is con- 
nected with this Sclerotinia. This fact has been known for 
some time of Sclerotinia fuckeliana, DeBary. 
Behrens! has recently studied a very destructive disease of 
hemp, but leaves some doubt as to whether the fungus studied 
by him is identical with Sclerotinia libertiana, Fk. or 
Sclerotinia fuckeliana, DeBy. ‘‘ Es muss also fortgesetzten 
Untersuchungen iiberlassen werden, Zu entscheiden, ob der 
hier vorliegende Hanfkrebs durch Sclerotinia libertiana, Fkl. 
order durch Sel. fuckeliana, DeBy. verursacht ist.’’ He 
found present on the hemp Botrytis cinerea, and some inocu- 
lations made with spores nourished in sugar solution produced 
the mycelium of Sclerotinia. Humphrey’s work leaves no 
doubt as to the genetic connection, since he used modern 
culture methods. His work is therefore of special interest. 
Tichomirow, who found a similar disease of hemp in Russia, 
thought it should be referred to Peziza kauffmanniana, but in 
all probability his fungus is nothing more than Sclerotinia 
libertiana, as DeBary has shown that this fungus will pro- 
duce a disease of hemp. Rehn,,? in his revision of the genus 
Sclerotinia, in Rabenhorst’s Kryptogamen-Flora, makes 
Peziza kauffmanniana a synonym of Sclerotinia liber- 
tiana, FkI. Lastly Sorauer*® refers to Botrytis infes- 
tans, Hazsl., as occurring on hemp, and Behrens thinks this is 
identical with B. cinerea. 
1 Ueber das Auftreten des Hanf Krebsesim Elsass. Zeitschrift fiir Pflan- 
zenkrankheiten, Vol. I, p 208. 
so Tichomirow, Peziza Kauffmanniana, eine neue Sclerotium 
stammende und auf Hanf schmarotzende Becherpilz-species. Bull soc. 
naturalistes de Moscou. 1868. 
2 L, ¢., pp. 800-824. Seep. 816. 
* Die Schiiden der einheimischen Kulturpflanzen, Berlin, 1888, p. 229. 
