17s FUNGOID PESTS OF CULTIVATED PLANTS. 



There are also two species of anthracnose known. 



Glososporium Rhododendri, with large irregular spots, which are 

 zoned, and have a black margin, the sporules 15-20x4-5//, found in Italy, 

 but not certainly British. And 



eosporium succineum, with sporules about the same size, but 

 globose and yellowish. Altogether a doubtful Siberian species. 



Rhododendron Brand. 



Puccinia Rhododendri (FckL). 



This brand has been found on the under surface of the leaves of 

 Rhododendron fcrrugineum in the Tyrol, but there is no record of it else- 

 where. The teleutospores are ovate, slightly constricted at the middle 

 (26 x 18 /i), brown. 



Sacc. Syll. vii. 2474. 



A rust on the leaves of Rhododendron fcrrugineum, dauricum, and 

 hirsutum, distinct from the above, has been found in Italy, France, 

 Germany, and Asiatic Siberia. It is known as Chrysomyxa Rhododendri 

 1 1 >('.). Teleutospores (10-14 /i broad) obtusely rounded above. Uredo- 

 spores warted, orange-yellow (17-28x15-22//). 

 e. Syll. vii. 2660. 



Leather-leaved Bristle SroRE. 

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



This disease attacks numerous plants with coriaceous leaves, besides 

 Rhododendrons, such as Iloya, Camellia, Citrus, and Magnolia. 



Greyish spots are formed on the leaves, often near the apex, usually 

 with a distinct and perhaps elevated margin. The pustules are scattered 

 like little black specks over the spots. The conidia are large, produced 

 within the pustules, and extruded when mature. They are somewhat 

 narrowly elliptical (20 25 /x long), attenuated at each end, and divided by 

 three or four transverse septa; the end cells smallest, conical, and colourless, 



: the Intervening cells brown. The apical cell furnished with three or 

 four long divergent hairs, as long as the conidia, the basal cell attached to 

 a colourless footstalk or peduncle. 



Diseased li hould be collected and burnt before the sporules are 



matured. 



Sacc. Syll. iv. 11 16; Cooke, Hdbk. No. 1 101 ; Mass. PL Dis. p. 432. 



Oleandeb Leaf-spots. 



<>n the Continent, where Neri/u/m Oleander is cultivated much more 

 Ively than in this country, its pests and parasites are of Ear more 

 interest, whereas we have no record of B single occurrence. 

 Phyllosticta Nerii has rather Large iporules (15-lHx5- (>/a). 

 .1 cochyta Oleandri, with septate sporules rather smaller (11-15x2 



Septoria la has short thread-like sporules, and so also has 



Septoria oleandrina, both of which are known in [talj ; and Hhahdospora 



