PESTS OF THE ORNAMENTAL SHRUBBEBY. 



5 



minute receptacles are scattered over the spots, on the upper surface ; 

 and the sporules are narrowly elliptical (8-12 x8-4) 2 p) and uncoloured. 



There is no probability of this ever becoming a troublesome pest in thin 

 country on the leaves of Magnolia grandiflora, on which it was first 

 discovered. 



Grevillea, ix. 94, xiii. 72 ; Sacc. Syll. iii. 130 bis. 



The older Phyllosticta magnolia is very similar in external appear- 

 ance, and has occurred in Italy, but the sporules are not one half as large 

 (4xli-2^). 



Phyllosticta glauca on leaves of Magnolia glauca is exclusively 

 American. 



Spots caused by species of Ascochyta and Septoria are also known, but 

 not hitherto as British. 



Evergreen Leaf-spots. 



It is somewhat fortunate that the Evergreen shrubs, which are so 

 commonly and extensively cultivated in this country, are remarkably 

 free from leaf-spotting fungi. 



Aucuba japonica can boast of several in Continental Europe, but not 

 a single British record. 



Prunus lusitanica is just as fortunate, or it has not been found out. 



Prunus Laurocerasus has its fungi on fallen leaves, but not upon the 

 living, except in other parts of Europe. 



Laurus nobilis sometimes exhibits spotted leaves, but hitherto there 

 is no evidence that they result from the incursions of parasitic fungi, else- 

 where than in Italy or Portugal. (Phyllosticta lauri, Sacc. 84.) 



Ilex Aquifolium. Even the Holly escapes the incursions of leaf-spots 

 of fungoid origin, although the leaves may sometimes show traces of 

 Fumago vagans or the mysterious Capnodium Footii and have occasion- 

 ally been visited by Phyllosticta ilicicola. 



Leaf Sooty Mould. 

 Capnoclium Footii (Harv.), PI. XVI. fig. 5. 



This very common black mould is found upon the leaves of a great 

 variety of plants, and often upon leathery leaves, such as Holly, Ivy, 

 Cherry Laurel, &c, forming thin sooty spots on the upper surface with 

 much the appearance of Fumago vagans. The creeping mycelium is 

 composed of a mixture of colourless and brown threads, divided into 

 chains of cells. The receptacles are erect and bristle-like, acute, and 

 fringed at the mouth, but genuine sporidia have never been found, so that 

 it remains a doubtful species. Minute sporules or conidia have been met 

 with, but the life-history of the parasite is still very much of a mystery. 



It is advisable to pick off and burn these sooty leave-, which aiv 

 usually conspicuous. 



Journ. B.H.S. iv. p. 254, f. 10; Sacc. Syll. i. 8o*2j Goofe, Hdbl: 

 No. 2807. 



