10 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



blood-red margin. The conceptacles are few upon the spots, and dot-like. 

 The conidia, or sporules, are oblong and minute (5x2 /<). 



It is noteworthy that in so many of the species of Phi/llosticta, or spot 

 with minute spores, we should have similar and corresponding spots of 

 the Septoria type with long thread-like spores, that is to say, there may 

 be on the same kind of leaves spots precisely similar, which in one case 

 produce minute spores and in another long and thread-like spores, the 

 difference being entirely that of the fructification. It has been suggested 

 that the perithecia which at an early period produce minute sporules 

 may at a later pericd produce thread-like sporules ; but this is only con- 

 lecture without evidence. And yet future knowledge of the life history 

 of these parasites may make it all plain. 



Sacc. Syll. iii. 219 ; Grevillea, xiv. 73. 



A leaf-spot precisely similar is known in Portugal and Italy (Asco- 

 chyt a fragarue) in which the sporules are elliptical (12-15 x 3-4 f.i) and 

 two-celled. Has appeared also in the United States, and threatens mis- 

 chief. 



Strawberry-leaf Spot. 



Septoria fragaricB (Desm.), PI. XII. fig. 39. 



This spot is familiar upon all Strawberry plants, but commonly in a 

 sterile condition. It occurs upon the upper surface of Strawberry leaves 

 as circular brown spots with a reddish brown margin. The conceptacles 

 are very minute, sprinkled over the spots as little black dots with a rather 

 iiK ad pore at the apex through which the mature conidia are expelled in 

 a whitish tendril. The conidia, or spores, are long and cylindrical 

 or thread-like, with three transverse divisions and colourless (about 50 

 long). 



It is unknown if any and what relations subsist between the several 

 species of fungi which thrive with us upon Strawberry leaves. It has 

 only been supposed that there is some connection, but it has not been 

 demonstrated. 



Sacc. Syll. iii. 27(57. 



Strawberry Anthracnose. 

 ( iltrnsjiori/iiii fnujarioe, (Lib.), PI. XII. fig. 40. 



This dn ease is not at all uncommon on Strawberry leaves, but has 

 never caused anxiety, since it was not credited with the power of inflicting 

 serious injury. The spots are reddish on the upper surface, without any 

 determinate outline. Upon these spots appear flattened blackish pustules, 

 which nestle beneath tin; cuticle. The mass of conidia form a greyish 

 nucleus within the cavity of the tissue. The conidia, or spores, are 

 cylindrical, obtuse, and contain a row of four or fiveguttules (2G-42 x 4 fi). 

 There i DO genuine conceptacle, but the surrounding cells are discoloured, 

 when mature the conidia ooze out at the apex of the pustules in 

 globule* or tendrils during moist weather and are washed over the 

 foliage. 



