14 FUNGOID PESTS OF CULTIVATED PLANTS. 



mycelium. Those are globose (45-55 /x diam.) with a yellow-brown coating, 

 or epispore, which is either smooth or minutely rugulose. 



The history and development of these rot-moulds are rather complicated, 

 and may be found more in detail in the Introduction, p. 3. 



The distribution of this pest includes not only Great Britain, but 

 France, Germany, Italy, Belgium, and North America. 



The remark on remedies under " Hellebore Rot-mould" applies with 

 equal force to this species. 



Sacc. Syll. vii. 807; Cooke, M. F. 234, t, xv., f. 267; Bcrlcse 

 Icones, t. 10 ; Cooke Hdbk. No. 1776 ; Mass. B. F. p. 112. 



Anemone- smut. 



Uroeystis Anemones (Pers.), PL I. rig. 7. 



This smut attacks the leaves and petioles of various allied plants, such 

 as Anemone, Hepatica, Aconite, Hellebore, Ranunculus, Pulsatilla, and 

 Eranthis, swelling and deforming them. 



To the naked eye its presence is very evident, as the leaves are 

 blistered, and the petioles swollen, becoming paler in colour, until the 

 distended cuticle bursts, and shows the mass of sooty spores, which are 

 produced in profusion, and scattered over the plant as soon as they are 

 mature, producing a most unsightly appearance. 



Under the microscope these spores are seen to be of a compound cha- 

 racter, forming glomerules, or clusters, more or less globose. The central 

 spores are dark brown, spherical, and compressed (18-16 /j) ; the peri- 

 pherical or outer cells, to the number of about ten or more, are colourless 

 and compressed at the sides (each glomerule about 26 ^ long). The tissues 

 of the host-plant are traversed by mycelium. 



This pest is to be found in most European countries, in Asiatic 

 Siberia, and in North America. 



It is always desirable to pick off and burn all infected leaves as soon 

 as tin parasite makes its appearance, and thus it will probably be kept in 

 cluck. Generally only one or two leaves are at first attacked ; but although 

 the pest may appear year after year, it is possible to keep it under control 

 if taken in time. 



Sacc. Syll. vii. 1901 ; Cooke 21. F. 91, 232, t. ix., f. 183, 184 ; Gard. 

 Chron. Sept. 30, 1876, fig.; Floicv. Brit. Ured. 288; Cooke Hdbk. 

 No. 1511 ; Mass. B. F. p. 188. 



Anemone Cluster-cups. 

 Mcidium punctatum (Pers.), PI. J. fig. s. 



The leaves of the garden Anemone are liable to attack from this 

 i ' cies of cluster-cup which is generally believed to be a distinct species 

 from the Mcidium Anemones (Pers.), which attacks the foliage of the 

 Wood Anemone, and has colourless a'cidiospores. 



The eups are scattered over the leaves, somewhat uniformly, whilst 

 the leaves arc much thickened by the mycelium. The cups are llattened, 

 and semi-immersed, with a torn, rather yellowish margin. The lobes are 

 larger than in the common wild species, and are often not more than 

 four to each cup. The secidiospores are almost globose (16-23 /*) and of 



