FUNGOID PESTS OF CULTIVATED PLANTS. 11 



The principal difference, as revealed by the microscope, lies in the 

 form and dimensions of the sporules, which, in the present instance, are 

 long and thread-like (40-50 /< long). 



It has been found on II . niger and H.fcetidus in Austria, and in 

 France, as well as in Britain. 



Fortunately it is so rare that experiments have not been made with 

 remedies, but probably spraying would be useful. 



Sacc. Sytt. iii. 2H40 ; Grevillea, xiv. p. 102, No. 507. 



A similar parasite occurs in Italy on the leaves of 77. viridis, in which 

 the spots are whitish and angular, circumscribed by a bhickish line, and 

 is called Ascochyta Hcllebori (Sacc). 



The species in this genus resemble externally those of Phylluaticta 

 and Septoria, but the sporules are different, since they are divided by a 

 cross-partition into two cells. In this instance they are about 8 x 2 p.. 



Hellebore Blotch. 

 Coniothyrium Hcllebori (Cooke and Mass.), PI. I. fig. 3. 



The leaves of the black Hellebore have been attacked in this country 

 by a new parasite, which at present seems to be unknown abroad, and, 

 fortunately, very little at home. 



The leaves are occupied by two or three dingy-brown spots, somewhat 

 circular in form, but without any determinate margin. The minute 

 dots of the p^rithecia are chiefly central, and more or less in concentric 

 rings. 



Microscopically it differs principally in the sporules, which are oval 

 (1-5 x 2-3 /.i) and of a pale brown colour, whereas in the other leaf- 

 spots enumerated here the sporules are colourless. 



It is unnecessary to suggest remedies. 



Grevillea, xv. p. 108 ; Sacc. Syll. x. 574.8. 



Hellebore Smut. 



Urocystis pompholygodcs (Schl.). 

 Urocystis Anemones (Pers.). 



This smut, which attacks Hellebore leaves, is also common on those 

 of Anemone Hcpatica, Ranunculus, Pulsatilla, Eranthis, &c, and is here- 

 after described as " Anemone smut." (See PL I. fig. 7.) 



Hellebore Leaf-mould. 

 Ramularia Hcllebori (Fckl.), PL I. fig. 4. 



This delicate mould occurs in whitish patches on living, or fading, 

 leaves of Hellebore in this country, and on the Continent, occupying 

 either surface of the leaf. 



• The spots are rather small and of a circular form, becoming white, 

 with a blackened or purplish margin- The mould appears to the naked 

 eye only as a delicate frosting on the spots. 



Under the microscope small tufts of slender short threads arise from 

 the mycelium, which pervades the spots (scarcely 20 /< long), and the 



