EUBASIDII 72s 



sickle-shaped conidia are set free; moreover the formation of 

 chlamydospores from a saprophytically nourished mycelium has 

 been observed. 



All the forms of conidia may give rise to germ-tubes which 

 are able to penetrate into the nodes and leaf-sheaths of very 

 young wheat plants, after which the growth and general be- 

 haviour of the mycelium in the host is similar to that of the 

 various species of Ustilago in wheat, barley and oats. 



Another species, namely TiUetia lavis Kiihn., is met with 

 upon wheat; it resembles T. Tritici in all points except that 

 its epispore is smooth. 



The remedies previously mentioned as suitable for the pre- 

 vention of 'smut' in cereals are also beneficial for the reduction 

 of ' bunt.' ' Pickling ' with copper sulphate gives excellent 

 results and should never be neglected. 



Ex. 294. — Examine the ' bunted ' grains of wheat ; notice the swollen form 

 of the grains and the odour of the black contents. 



Are all the grains in an ear 'bunted.' Observe the openness of the 

 glumes in a ' bunted ' ear. 



Ex. 295. — Examine in water with a high power the chlamydospores of 'bunt. ' 

 Observe the difference between the coat of a ripe spore and that of an 

 unripe one. 



Contrast the size of these spores and the chlamydospores of ' smut. ' 

 Ex. 296. — Germinate the chlamydospores of 'bunt' as follows: — Slightly 

 crack some bunted grains of wheat so that the chlamydospores are exposed 

 to view ; then dip the grains in rain or well water and place them on damp 

 blotting-paper on e plate, covering the whole with a bell-jar. Examine daily 

 until a fine white mould is visible on the grains ; transfer with the point of a 

 knife or with fine forceps some of the filmy mould to a drop of wa ter on a 

 slide and view with a high power. Make drawings of the conidiophores and 

 the long sickle-shaped conidia. 



Sub-class 2. — Eubasidii. 



6. In the second sub-class of the Basidiomycetes or the 

 Eubasidii the conidiophore bears a definite limited number of 



