178 FUNGOID PESTS OF CULTIVATED PLANTS. 



There are also two species of anthracnose known. 



Glceosporium Rhododendri, with large irregular spots, which are 

 zoned, and have a black margin, the sporules 15-20 x 4-5 /n, found in Italy, 

 but not certainly British. And 



Glceosporium 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 ferrugineum in the Tyrol, but there is no record of it else- 

 where. The teleutospores are o^ate, slightly constricted at the middle 

 (26 x 18 /i), brown. 



Sacc. Syll vii. 2474. 



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

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

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

 (DC.). Teleutospores (10--14 p broad) obtusely rounded above. Uredo- 

 spores warted, orange-yellow (17-28 x 15-22 /j). 



Sacc. Syll. vii. 2660. 



LEATHER-LEAVED BRISTLE SPORE. 

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



This disease attacks numerous plants with coriaceous leaves, besides 

 Rhododendrons, such as Hoya, 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, 

 and 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 leaves should be collected and burnt before the sporules are 

 matured. 



Sacc. Syll. iv. 4146 ; Cooke, Hdbk. No. 1401 ; Mass. PL Dis. p. 432. 



OLEANDER LEAF-SPOTS. 



On the Continent, where Nerium Oleander is cultivated much more 

 extensively than in this country, its pests and parasites are of far more 

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



Phyllosticta Nerii has rather large sporules (15-18 x 5-6 //.). 



Ascochyta Oleandri, with septate sporules rather smaller (11-15x2 



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

 Septoria oleandrina, both of which are known in Italy ; and Ehabdospora 



