PESTS OF THE VINERY AND STOVE. 



325 



cylindrical, straight, rounded at the ends, without guttules (14-18 x 5-6J //). 

 This has been detected only in Italy. 



Another Italian species is Glceosporium depression, occurring also on 

 dry spots on fading leaves, with the pustules scattered on the under sur- 

 face. The conidia are elongated elliptical (7-8 J x2^-4^<), produced upon 

 rather long fasciculate basidia (20-24 /j long). 



The Belgian species has large irregular greyish-brown spots, without 

 definite margin, on which are seated the small whitish pustules. The 

 conidia are ejected in flesh-coloured masses, and very minute (3 p long). It 

 is called Glceosporium aurantiorum. Another Italian species (found 

 also in France), Glceosporium intermedium, has the pustules pointlike, 

 black, without forming definite spots, with long straight conidia, rounded 

 at the ends (14-18x4-6^). 



Yet another occurs on Orange as well as on Hoy a leaves (Glceosporium 

 macropus) without forming any definite spots, the long conidia (18-21 x 

 4-6 /j.) produced on very long basidia (48-60 fi long). Any of these may 

 be found in our conservatories at any time. 



The Olive is not sufficiently cultivated in this country to render its 

 parasites of much interest. 



Fig Mould. 

 Botrytis cinerea (Pers.). 



This mould, long regarded as a saprophyte, has been found destructive 

 to ripe figs, covering them with a dense felted mass of grey hypha?, and 

 bearing a profusion of oval conidia. It appears to be the same species as 

 causes the Lily disease. For other Fig parasites see " Pests of Orchard 

 and Fruit Garden." 



Journ. B.H.S. xxviii. p. xxxix and p. 29. 



A black mould, Cercospora Bolleana (Thum.), has occurred on Fig 

 leaves, and is believed to have appeared recently in Britain. 



Camellia Blotch. 

 Pestalozzia Guepini (Desm.), PI. XIV. fig. 17. 



This disease is far from uncommon on the leaves of Camellia under 

 cultivation, and is so widely extended that it attacks the Tea plants in the 

 Tea gardens of India. 



It causes unsightly large blotches on the living leaves, which are 

 mostly of a rounded form, but sometimes irregular through confluence of 

 the blotches. They are bleached and of a silvery white colour on the 

 upper surface, with a strongly defined outline, and sprinkled with the 

 black dots which indicate the pustules. There are no true perithecia, 

 the sporules being produced in small cavities in the substance of the leaf, 

 the surrounding cells modified and discoloured so as to form a false 

 receptacle. 



The sporules are of a remarkable kind, peculiar to the genus. In out- 

 line they are somewhat spindle-shaped, being attenuated towards each end 

 (20 fx long), with three or four transverse divisions, the apical cell colourless 



