328 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



it belongs to a genus which is eminently destructive, and includes many 

 pests. 



The spots on the leaves are variable, both as to size and form, becom- 

 ing 1 'leached or whitened, having little pustules on the surface. These 

 pustules are scattered, and consist of small discoloured cells, without 

 any true or distinct outer covering or receptacle, nestling beneath the 

 blackened cuticle. The pustules appear chiefly on the upper surface. 

 At length an irregular opening is made, and the conidia ooze out in the 

 form of a tendril. They are cylindrically oblong, rounded at the ends, 

 colourless, and spring at first from the cushionlike base of the pustule, 

 borne on short delicate basidia. Conidia of moderate size for the genus 

 (14-20 x 4-6 ft). 



The parasite occurred on leaves of Hoy a and on JEscliynantlius. 

 Apparently the same species has also occurred on leaves of Orchids at 

 ( i lasgow. 



We can only advise strict burning of all diseased leaves. 

 Sacc. Syll. iii. 3707 ; Grevillea, xix. 42. 



Two other species of Anthracnose are recorded on Hoya, in Italy, 

 under the names of Glozosporium sphcerclloides and Gl&osporium 

 macropus. 



Tea and Coffee Pests. 



The fungoid pests of Tea and Coffee shrubs are not of much interest 

 to the home horticulturist, although of considerable importance in the 

 tropics, the Ceylon Coffee disease especially, Hemileia vastatrix (Berk.), 

 having caused immense damage in the plantations, not only of Ceylon, 

 but in Southern India, and in tropical South America. So also has the 

 Coffee Leaf -rot, Pellicular ia Koleroga (Cooke), in Southern India. 



The Tea shrub is liable to the attacks of Pestalozzia Guepini, which 

 is described above. 



Gcurd. Citron. Oct. 25, 1379, fig. 87. 



Azalea Leaf-dot. 

 Pestalozzia longiseta (Sacc). 



This species was first found in Italy on living leaves of a species of 

 I: a I his, but in this country it has been found on Azalea leaves. The 

 spots are rufous, margined by a black line, on which are seated the point- 

 like pustules, which are themselves black, covered some time by the 

 cuticle. The conidia are almost fusiform, pointed towards each end 

 (20x8ft), divided by four transverse septa. The three central cells are 

 coloured dark brown, the two extreme cells small and colourless. From 

 tin' upper cell spring three very long hairlike processes (30-40 x 1 p). 

 The Lower cell is attached to a slender hyaline pedicel. 



Like Anthracnose, this is a deeply seated endophytal disease, and all 

 that can be done is to prevent its spreading. 



Sacc Syll. iii. 4115 ; Grevillea, xv. p. 10. 



