Brier ley ,— The ‘ Endoconidia ’ of Thielavia basicola, Zopf. 487 
in early conidial formation the latter membrane is not easy to see, owing to 
the browning and increasing opacity of the sheath. 
It will be noted that the development of each transverse wall adds 
a minute fraction to the length of the sheath. In consequence early conidial 
Text-fig. i. Uninucleate conidiophore. 2. The nucleus divides and one daughter-nucleus 
passes to the upper end of the cell. 3. A transverse wall develops as an ingrowing diaphragm 
cutting off the upper region of the conidiophore. 4. The first conidium is delimited. 5. The wall 
of the conidium differentiates into two layers. 6 and 7. Rupture of the sheath and liberation of the 
conidium. 8 and 9. Formation of the second conidium. 10. Liberation of the second conidium. 
11. Formation of the fourth conidium. 12. Late conidial formation at base of long sheath. 
formation occurs at the base of a short sheath; whilst later it appears to 
take place some considerable distance within the neck region of the coni¬ 
diophore, in reality at the base of a long sheath (PL XXIII, Figs. 8, 9). The 
latter therefore contains several spores at once, thus giving the appearance 
K k 
