510 Lang . — On Apospory in Anthoceros laevis. 
equally unsafe to assume that this deviation from the normal 
life-history is a reversion, or to dismiss it as a mere sport with 
no phylogenetic bearing. 
In conclusion I have to express my indebtedness to the 
Director of the Royal Botanic Gardens at Peradeniya for the 
use of a table in the Laboratory where the culture was made 
and the observations commenced. 
EXPLANATION OF FIGURES IN PLATE XXVII. 
Illustrating Dr. Lang’s paper on Apospory in Anthoceros. 
Fig. i. End of a piece of sporogonium after six weeks’ cultivation, showing the 
aposporously-produced growths arising from the cut surface, x 80. 
Fig. 2. Surface-view, of a growth like those in Fig. i, which has produced 
a rhizoid. x 375* 
Fig. 3. Surface-view of a growth referable to a single cell of the sporogonial 
wall, exposed by the separation of the epidermis, x 375. 
Fig. 4. Longitudinal section showing the rounding off and division of a number 
of cells of the partially disintegrated wall, x 200. 
Fig. 5. Similar section to Fig. 4. The wall is hardly disintegrated; the two 
new growths are covered by epidermis, x 200. 
Fig. 6. Section through the end of a piece of sporogonium, showing the origin 
of two growths from different layers of the wall. X 200. 
Fig. 7. Section through one of the most advanced growths like that in Fig. 2. 
X 200. 
