822 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



As to the specific differences between the two species recorded as 

 Gloeosporium orbiculare and Gloeosporium Iceticolor it is not of much 

 practical importance, and some at least of American mycologists believe 

 them to belong to the same species. 



Recorded in Portugal as well as in Britain. 



Every effort should be made to prevent the dispersion of the conidia of 

 all species of Gloeosporium, by spraying, and destruction of the affected 

 parts. 



Sacc. Syll. iii. 3759 ; Cooke, Hdbh. No. 1407 ; Berk. Ann. N. H. 

 No. 106, t. vii. f. 6. 



CUCUMBEE AnTHBACNOSE. 



Gloeosporium lagenarium (Pers.), PI. VIII. fig. 127. 



To this fungus is attributed the fungus disease which attacked 

 Cucumber plants in 1892 and 1893, but was previously known upon Gourds 

 on the Continent. In this instance the leaves, some portions of the vines, 

 and especially the ends of the young fruits, rotted and became pulpy. No 

 distinct pustules could be detected, but the rotting parts contained 

 fungus mycelium, and a great number of the sporules of the Gloeosporium. 



The pustules are disposed to occur in rings, and are rather small upon 

 the fruits, and somewhat roseate ; the conidia are ovate-oblong, often 

 unequal-sided (16-18 x 5-6 /x), colourless, and without division, growing 

 on pedicels nearly as long as the conidia, oozing out when mature. 

 The habit is certainly different from that of Gloeosporium orbiculare, and 

 attacks also the stems and foliage. 



Among the tissue of the surface of the fruits were found the fusi- 

 form curved conidia of another pest, Fusarium reticulatum, which are 

 triseptate (40 /x long), and are constantly found in company with this 

 Gloeosporium upon gourds. 



It is reported in France and Italy as a noxious pest. 



Sacc. Syll. iii. 3757. 



Another species, if really distinct, has been found on Gourds in 

 Australia. 



Cucumber White Mould. 

 Oidium erysiphoidcs (Link), PI. IX. fig. 128. 



This troublesome white mould is very apt to make its appearance on 

 Cucumber or Melon plants in frames, or on Gourds in the open. It 

 spreads in white blotches over the foliage and often covers the plant. 



There is a profuse mycelium, and sometimes nothing more, from 

 which arise short erect fertile branches, of a rather thick club -like shape, 

 which are soon divided by transverse partitions into cells ; each of these cells 

 becomes a conidium and acquires a roundish or elliptical shape, and then 

 falls away from its fellows. When quite mature they are capable of 

 germination (30-40 x 15-20 ft). 



The healthy action of the leaves is obstructed, and they soon acquire a 

 sickly appearance, and the stems are apt to rot off at the base. 



