460 DISEASES OF CULTIVATED PLANTS 



The injury is caused by Botrytis cinerea, which eventually 

 covers the decayed fruit. I have observed that under certain 

 conditions that figs, when becoming ripe, emit a small amount 

 of a sweet liquid through the pore at the apex of the ' fruit.' 

 Botrytis spores germinate readily in this liquid, the mycelium 

 passing into the soft tissues of the fig and causing the disease. 

 Whether the emission of liquid by the fig is due to excess of 

 nutrition or to excess of water, I have not been able to deter- 

 mine. 



Botrytis diospyri (Briozi), a new species, is described as 

 attacking the fruit of Diospyros kaki> in Rome. The fungus 

 is characterised by having much branched mycelium running 

 between and through the cells of the pericarp ; the conidio- 

 phores are snow-white, and form a thick felt on the surface of 

 the host. Small sclerotia, at first yellowish, then black, are also 

 produced. Ascigerous form not known. 



Briozi, U., Ann. della R. F. Staz. di Patol Veg., i, p. 132 

 (1901). 



Botrytis depraedens (Cooke). This fungus sometimes proves 

 a serious pest to young sycamores. Greyish spots are formed 

 on the leaves, which often run into each other. 



Conidiophores simple, flexous, heads of conidia globose 

 and compact. Conidia globose, 1 2 /x diam. 



ACREMONIELLA (SACC.) 



Hyphae creeping or ascending, bearing short, simple 

 conidia-bearing branches here and there ; conidia globose 

 or ovoid, continuous, solitary on the conidiophores, coloured. 



Cereal mildew. Cavara mentions a small hyphomycetous 

 fungus that forms brownish-yellow flakes on the haulms of 

 cereals, near to the nodes. No amount of injury is recorded. 

 The fungus is Acremoniella occulta (Cavara). 



Mycelium forming a loose, white, cobweb-like layer, hyphae 

 scattered, stout, septate, branched, fertile branches erect, with 

 short, lateral branchlets, each bearing a terminal, globose- 

 depressed, opaque, black conidium, 15 x 9-1 2 p. 



Cavara, F., Zeitschr. Pflanzenkr., 3, p. 24 (1893). 



