1900] BOTRYTIS AND SCLEROTINIA 391 
The writer was unable to obtain material of this disease and 
consequently has no original information to offer concerning it. 
This case has been brought forward as one of the best examples 
of the connection between Botrytis and Sel. Libertiana, but Dr. 
Behrens’ later statement changes the aspect completely. With 
his original conclusions discredited by himself there remains the 
fact that Tichomiroff and Hiltner found the disease caused 
respectively by Sclerotinia and Botrytis alone, and no proof is 
to be found that the two forms had any connection with one 
another in attacking this plant. The fact that Behrens found no 
Botrytis in connection with the disease during one season gives 
further evidence that this species was entirely distinct, though 
in similar effect and appearance. 
RAPE DISEASE, 
BIBLIOGRAPHY. 
4 
- HAMBURG, E. A. Peziza ciborioides Fr., etc. III. Féldniv. Erdec, 8 :509. 
1880. (Bot. Centralb. 8 :172. 1881.) 
2. De Bary, A. doc. cit. 458. 
3. Frank, A.B. Sclerotienkrankheit des Rapses. /oc. cit. 493. 
4. SORAUER, P. Die Sclerotienkrankheit des Rapses. oc. cit. 297 
The disease of the rape plant described by Frank (3) is also 
one of interest in this connection. Plants were found to be 
affected by a rotting of the stem, the cortex and pith being 
filled with a fungous mycelium, soon becoming completely 
destroyed. Numerous black sclerotia were present in the pith 
Cavity. The filaments of the mycelium were hyaline, filled with 
granular protoplasm with vacuoles, septate and branching pro- 
fusely in all directions. The largest had a diameter of 20p. 
The sclerotia were of irregular form and had a diameter of 
arom, In places where the plants stood close together Botrytis 
cinerea often appeared upon the diseased portion of the stem. 
When affected stems were put under conditions of moisture this 
always occurred, The Botrytis hyphae seemed to arise without 
doubt from the interior filaments. Further development was 
obtained by placing sclerotia on moist sand, when they produced 
