PESTS OF THE VINEEY AND STOVE. 



329 



Another leaf-spot, of an ordinary kind (Scptoria Azalea), has been 

 recorded in Italy, and is just of the kind that is likely to spread. 



A rust on Azalea has been known in North America (Uredo Azalea) 

 for very many years, but does not appear to have done much mischief. 



Jasmin Chain Mould. 

 Chromosporium pactolinum (Cooke), PI. XV. fig. 22. 



First described under the name of Oidium pactolinum, when it was 

 found on living leaves of Jasminum Sambac, forming a thin stratum, as 

 if sprinkled with gold-dust or chrome powder. The threads, if any, were 

 not to be detected, the powder consisting of the nearly globose conidia, 

 attached to each other in chains of from six to ten cells. Whilst remain- 

 ing attached, the ends of the conidia are flattened at the point of junction, 

 but when free they acquire a globose form (10^ diam.), with a thin 

 hyaline membrane, but with granular golden-yellow cell-contents. 



At present this has only been recorded in Britain, and is certainly 

 epiphytal, probably not at all injurious to the plant : at any rate it is very 

 curious. 



Grevillea, xii. 98 ; Sacc. SylL vi. p. 633, x. p. 511. 



Two or three kinds of leaf-spot have been caused upon Jasmin-leaves 

 by imperfect fungi, but none of these have been recorded as British. 



Passion-flower Black Mould. 

 Zygosporium oscheoides (Mont.), PI. XV. fig. 23. 



This minute black mould was first discovered in Cuba, growing on 

 dead leaves, and was only regarded as a saprophyte, but recently it has 

 been recorded on leaves of Passiflora quadrangular is, seemingly under 

 the impression that it was a parasite, and a new species, under the name 

 of Cladotrichum passiflorce (Pirn.). 



The fertile threads are erect, septate (70x3/u), sooty brown, inflated 

 and paler at the apex, at the base emitting a semilunar sporophore. 

 Conidia, oval or globose, produced singly or in pairs at the apex of the 

 sporophores (o \x diam. or 12 // long). 



The peculiarity is that the hyaline conidia are borne at the end of 

 curved club-shaped branches, which is sufficient to identify the species. 



This same mould has been found in Cuba and elsewhere on Screwpines 

 and Palms. 



Gard. Chron. Dec. 5, 1885, p. 724, fig. 164 ; Sacc. SylL iv. 1591 ; 

 Cor da, Icon. vi. 



Stephanotis Leaf-spot. 

 Phyllosticta Stephanotidis (Grove), PI. XV. fig. 24. 



This leaf -spot was detected on the leaves of Stephanotis in 1886, 

 forming round or irregular spots, which are bleached or whitened and 

 surrounded by a thin dark brown line. The receptacles appear on the 

 upper surface, and are small, numerous, and scattered over the spins, 



c 



