Pilzkrankkeiten der Pflanzen 
247 
masses of conidiophores in centradistinction to Sclerotinia jructigena , 
which also attacks apple and which produces well-marked, yellowish masses 
of conidiophores both in nature and on culture media. 
As yet the ascospore stage of this fungus is unknown, and the 
author having been unable to observe conidia arising from the mycelium 
which passed winter in the tissue of twigs, the question how the fungus 
survives the winter and reappears in the following spring remains un¬ 
settled. 
The author is of the opinion that the present fungus, though nearly 
allied to the conidial form of Sclerotinia Kusanoi, is to be regarded as 
a distinct species inasmuch as his attempts to infect the apple flower 
with pure cultures of Sclerotinia Kusanoi were unsuccessful and as the 
hosts of these parasites are generically different. However, the author left 
the fungus under review unnamed. 
This disease is very prevalent in Hokkaido and in Aomori 
Prefecture, Honshu, causing serious losses to the growers. Pirus 
spectabilis is also susceptible to this disease. 
Sclerotinia Kusanoi P. Henn., originally found in its conidial stage 
on Prunus Pseudo- Cer asus in the vicisuty of Tokyo, occurs in Hok¬ 
kaido on the cherry and on Prunus Pseudo- Cer asus under cultivation. 
The author collected for the first time the apothecia of the fungus in 
April, 1909 at Ono, Prov. Oshima, Hokkaido, which were found arising 
from the mummified fruits of the cherry and Prunus Pseudo- Cer asus. 
The fungus attacks young shoots and leaves to some extent. But 
its most noticeable effects are upon the young fruits. These turn brown 
and bear conidia of the causal fungus on their surface, eventually becoming 
mummified and falling off, and the apothecia develop from these mummies 
the following spring. Transverse sections show that the tissue of the 
seed and endocarp is completely replaced by sclerotia, the exocarp also 
containing abundance of hyphae. 
The characteristics of the fungus are as follows: 
Apothecia one or sometimes two from a single mummy, stipitate, 
hyménium greyish brown, outer surface darker. Stipe smooth, dark 
brown, 3—8 mm in length, depending upon the distance of thè mummy 
beneath the soil. Disc cup- or funnel-shaped, about 6 mm ac¬ 
ross, becoming convex with age. A sei several from a single hyphal 
branch, cylindrical-clavate, 125—140x7—9 ju, with rounded apex. 
Spores 8, obliquely uniseriate, ellipsoid, hyaline, continuous, 10.5—13.5 
X 4.5—6.0 /^. Paraphyses hyaline, septate, filiform, more or less 
branched, slightly swollen at the tips. 
Conidia (chlamydospores) on young shoots and leaves, effuse, 
powdery, whitish, or in minute cespitulae on mummied fruits, lemon¬ 
shaped, hyaline, continuous, 10.5—16.5x7—12 ju, with well-developed 
fusiform disjunctors. 
On Prunus Cerasus and P. Pseudo-Cerasus, Honshu and Hok¬ 
kaido, Japan. 
Sown on culture media the ascospore readily produces a faintly 
greyish mycelium and fruits freely, producing conidia and microconidia, 
but not forming well-marked masses of conidiophores. The conidia thus 
produced were applied to the stigma of a number of flowers of Prunus 
Pseudo- Cerasus, and the result was that the majority of the young fruits 
