Brierley.—The ‘ Endoconidia’ of Thielavia basicola, Zopf. 493 
EXPLANATION OF PLATE XXIII. 
Illustrating Mr. Brierley’s paper on Thielavia. 
The figures were drawn with the aid of a Zeiss camera lucida. A Zeiss 2 mm. apochromatic 
1*4 objective was used with a x 12 compensating ocular (Fig. 7), a x 18 comps, oc. (Figs. 3 a, 
5 a, 10 a, lift), and a x 6 comps, oc. (remaining Figures). 
Abbreviations ; used :— c . = conidiophore ; n. = nucleus; v. — vacuole; 0. = oil-globule; 
p <= protoplasmic strand; s. = transverse wall; sh. = sheath ; sc. = sheath cap; spV. = <-shaped 
marking outside transverse wall; spl. = line of differentiation of sheath and spore wall. 
Figs. 1-4. Formation of the first conidium. 
Fig. 1. Mature conidiophore. 
Fig. 2. The nucleus divides and one daughter-nucleus (n\) passes to the apex of the conidio¬ 
phore. Specimen slightly plasmolysed. 
Fig. 3. Formation of the transverse septum as an ingrowing ring of cell-wall substance. 
Fig. 3 ft. Details of above more highly magnified. 
Fig. 4. The completion of the transverse wall has cut off the first conidium. 
Fig. 5. The walls of the conidium differentiate into two layers, the splitting being in the line 
of the <-shaped marking. 
Fig. 5 ft. Details of above more highly magnified. 
Fig. 6. A specimen strongly plasmolysed to show more clearly the differentiation of the walls 
of the conidium (reduced by one-half). 
Fig. 7. The tip of the conidiophore shortly after the liberation of the first conidium. 
Fig. 7 ft. The sheath, ruptured below the apex and its tip borne away on the conidium. It is 
interesting to note that in this case the conidiophore is the germ tube of a conidium. 
Fig. 8. Late formation of conidia at the base of a long sheath. 
Fig. 9. A similar stage in which the conidia have been removed to show the sheath. 
Fig. 10. Abnormal development of transverse wall, leaving a wide protoplasmic strand. 
Specimen much plasmolysed to show relations of walls. 
Fig. ioft. Details of above more highly magnified. 
Fig. 11. Abnormal development of transverse wall resembling lamellose plugs of Codium. 
Fig. lift. Details of above more highly magnified. 
