114 



ON THE PROPAGATION OF BUNT. 



out by those who have fewer avocations than myself. Many 

 anomalous appearances, amongst Algae especially, seem to indi- 

 cate something of the kind. 



It remains only to characterise the parasite on the bunt, which 

 is certainly quite new to science. It would be easy to form a 

 new genus, from the circumstance of the spores ultimately con- 

 jugating ; but as this does not seem connected with the repro- 

 duction of the species, and the other characters are altogether 

 those of Fusisporium, I shall place it in that genus. The 

 characters then will stand as follows : — 



Fusisporium inosculans ; minutissima, fasciculata, alba ; 

 sporis longissimis incurvis vel flexuosis multiseptatis demum 

 conjugatis. 



Hat), in sporas germinantes Uredinis Cariei, D.C. 



It forms extremely minute white tufts, visible to the naked eye 

 only where the spores on which they grow are thickly spread. 

 Threads at first simple and erect ; rather obtuse, soon forked 

 above, and producing much elongated fusiform, multiseptate, 

 curved or flexuous acuminate spores, which ultimately contain 

 globular sporules, or nuclei, at length connected with one 

 another by one or more short transverse tubes. 

 King's Cliffe, Jan. 15, 1847. 



Fig. 1. Spores of bunt seven days after sowing. One is still in its natural 

 state, another germinating, and two crowned with a fascicle of the parasite 

 (Fusisporium inosculans). 



Fig. 2. Threads of the parasite more highly magnified, filled with globules, 

 two of which are free. 



Fig. 3. Various views of the parasite and its spores, three days later, 

 magnified. The spores of the parasite are fully developed, and once or twice 

 conjugated. The globule -bearing thread and spore, marked a a, are more 

 highly magnified than the others. 



Fig. 4. Spores of Uredo at the same date ; two with the germinating 

 thread more elongated ; one ruptured and empty, and another with the disc 

 split in three directions. 



Fig. 5. Spores of Uredo two days later ; in one the germinating thread 

 gives off a branch on either side. 



Fig. 6. Spores of parasite of the same date, conjugating with each other. 



Fig. 7. Portion of spore of parasite more highly magnified. 



Fig. 8. Spores of Uredo three days later ; the germinating thread elon- 

 gated. The parasite now very scarce. 



Fig. 9. Parasite produced on the germinating thread of Uredo, in an ex- 

 periment made some days later. 



Fig. 10. First appearance of spores in the diseased germen, with the 

 mycelium. 



Fig. 1 0*. One of the spores more highly magnified. 

 Fig. 11. Gradual developement of spores. 



Fig. 12. Three views of perfect spore, by Mr. Broome, as seen at different 

 focal lengths. 



