180 FUNGOID PESTS OF CULTIVATED PLANTS. 



tufts upon the spots, with quite short threads, but the conidia are 

 elongated, slightly curved and attenuated upwards, divided transversely 

 into numerous cells (95 x 3^ p). Both threads and conidia are tinged olive. 

 Sacc. Syll iv. 2269. 



MAGNOLIA LEAF-SPOT. 

 Phyllosticta Cookei (Sacc.), PL XVI. fig. 4. 



As might be anticipated, the fungus attacks on Magnolia are far 

 more numerous in America than in England, and even those which we do 

 recognise are but seldom to be met with. The one above named, when 

 first found, was called Pliyllosticta Magnolia, but that name was after- 

 wards found to have been previously appropriated. The pale bleached 

 spots on the leaves are rather large and without any definite margin. The 

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

 and the sporules are narrowly elliptical (8-12 x 3-4J //; and uncoloured. 



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

 country on the leaves of Magnolia grandiflom, 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 largo 



(4x14-2,)- 



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. 



EVEEGEEEN LEAF-SPOTS. 



It is somewhat fortunate that the Evergreey 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. 

 Capnodium Footii (Harv.), PL 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, 



