10 MICEOSCOPIC FUNGI. 



named Mcidium Thesiij but wliich is far from uncom- 

 mon on the Continent. It occurred in this instance- 

 on the Downs^ in the vicinity of Winchester. 



It is unnecessary here to refer to other alHed 

 species of j^cidium, except one to be pre- 

 sently noticed^ since we have_, at the end of 

 the volume^ enumerated and given descriptions 

 of all the species hitherto found in Britain. 

 Suffice it to say that the Buckthorn cluster- 

 cups on the alder buckthorn {Rhamnus froM' 

 gula), is usually very common in the Highgate 

 and Hornsey woods, and on the common buck- 

 thorn {Rhamnus catharticus) in the neighbourhood 

 of Dartfordj in Kent. That on the honeysuckle we 

 have found but very rarely. On the gooseberry 

 and red-currant leaves, commonly in some years 

 and rarely in others ; whilst a few of those de- 

 scribed we have never collected. The species on 

 different composite plants is subject to great vari- 

 ation, and on most may be found in the autumn ; 

 one variety only, on the leaves of Laj^sana communis, 

 we have met with in the spring. 



Very few years ago farmers generally believed 

 that the cluster-cups of the berberry {Berheris vuU 

 garis)j were productive of mildew in corn grown 

 near them ; this opinion even received the sup- 

 port of Sir J. Banks, and recently it has been 

 revived amongst botanists, but is not absolutely 

 accepted, as not wholly proven. In this instance 

 the cups are much elongated^ and cylindrical;. 



