FUNGOID PESTS OF CULTIVATED PLANTS. 149 



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 

 broad 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 n 



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. 2767. 



Strawberry Anthracnose. 

 Glceosporium Fragarice (Lib.), PI. XII. fig. 40. 



This disease 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 the 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 five guttules (26-42 x 4 fi). 

 There is no genuine conceptacle, but the surrounding cells are discoloured, 

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

 globules or tendrils during moist weather and are washed over the 

 foliage. 



All species of this genus are suspicious, and we doubt if this is really 

 so innocent as has generally been supposed. 



It is known in France, Belgium, Germany, and the United States. 



.Sacc. Syll. iii. 3690. 



Stbawbebby Spot Mould. 

 Ramularia Tulasnei (Sacc), PL XII. fig. 41. 



This fungus spots the leaves in a very similar manner to the ordinary 

 leaf-spot. They are rather small orbicular white spots with a broad 

 definite dark reddish margin, but without any dots. A white mould is 

 seated upon the spots, which produces little bundles of colourless threads, 

 and these develop at their tips cylindrical hyaline conidia which are 

 straight, with one or two cross divisions (80-35 x3-4 /j). What appears 

 to be the same fungus was known here for some years under the name 

 of Cylindrosporium Grcvilleanum. The life history of this fungus has 

 been investigated in North America, and hence we know more of it than 

 of most leaf-spots, and that this fungus constitutes the conidia of another 

 fungus, which appears later on and is known as Sphcerella Fraga/ria. 

 For our purpose we may treat them as two separate diseases, with 

 different manifestations and different treatment. 



The mould is known in Britain, France, Italy, Holland, and North 

 America. 



