188 FUNGOID PESTS OF CULTIVATED PLANTS. 



It may be noted that another species of Mcidium (JE>. graveolens) has 

 been discovered on the leaves of the same species of Berberry in Switzer- 

 land, with the cluster-cups scattered over the surface of the leaf, and 

 having an appreciable odour. 



Sacc. Syll. vii. 2716 ; Cookc, Fungi, their Uses, p. 201. 



And yet another species (JE. magelcenicum), also on the leaves of 

 Berberis vulgaris, in Hungary, Austria, Germany, and the Straits of 

 Magellan, also with the cluster-cups scattered over the leaves. 



Sacc. Syll. vii. 2715 ; Berk. Hook. Fl. Ant. ii. 450. 



BUCKTHORN LEAF-SPOT. 

 Phyllosticta Ehamni (West). 



The leaves of the Buckthorns are rather subject to spotting. This 

 spot is to be found on the leaves of Ehamnus Frangula and Ehamnus 

 Alaternus in Belgium, Portugal, and Italy, and sometimes in Great 

 Britain. The spots are variable in form, ochraceous, with a brown 

 marginal line. The receptacles are gregarious in the centre of the spot. 

 Sporules ovoid (5-6 x 3-4 /*), with a tinge of olive. 



Sacc. Syll. iii. 62 ; Grevillea, xiv. 71. 



A similar species (Phyllosticta rhamnigena) occurs on Ehamnus 

 cathartica in France, Portugal, and Italy, with dirty white circular spots 

 and small sporules (4J-5 x 3/z), which seems to be very little different. 



The Italian species on Ehamnus catharticus has the roundish spots, 

 with a reddish- brown margin, and the sporules larger (10x4/j) and 

 uncoloured. 



In Belgium a spot is known on the leaves of Ehamnus Frangula in 

 which the round spots are brown, then grey (Phyllosticta Frangula), with 

 a vinous -red margin. 



BUCKTHORN CLUSTER-CUPS. 

 ^cidium crassum (Pers.), PI. XVII. fig. 24. 



The cluster-cups of the different species of Ehamnus now lose their 

 identity under the name of Puccinia coronata, because the presumed 

 teleutospores ara to be found onjhe leaves and culms of grasses. 

 Fortunately we are privileged to retain the old name, as we regard it 

 solely as a disease of Buckthorn leaves. 



The cups are clustered upon thickened yellowish spots, and are 

 cylindrical, with a spreading margin, which is finely toothed and white. 

 The aecidiospores are angular by compression (17-26 x 13-21 /x), warted, 

 and of an orange colour. 



This disease is reputed to prevail over the greater part of Europe, in 

 North America, and in South Africa. 



Should it be found necessary to check the spread of this parasite, it 

 will doubtless be found sufficient to pick off and burn the diseased leaves, 

 which are seldom numerous. 



