304 Johnson. — Sphaerococcus cononopifolius ) Stackh. 
EXPLANATION OF FIGURES IN PLATE XVIII. 
Illustrating Mr. Johnson’s paper on the procarpium and fruit in 
Sphaerococcus coronopifolius (Stackh.). 
Fig. i. A piece of the fruit-bearing thallus. cys. cystocarp. p. b. procarpium- 
branch. x 4. 
Fig. 2. The small piece, a, of Fig. 1 more highly magnified. Letters as before, 
x 40. 
Fig. 3. A procarpium (except carpogenous cells), c. carpogonium. h. c. hypo- 
gynous cell. c. 1 . cells of lateral branch, c. s. cells of central axis. t. trichogyne 
projecting at right angles to plane of vision, x 1000. 
Fig. 4. A part of a procarpium-branch. t. trichogyne projecting, x 480. 
Fig. 5. Beginning of cystocarp. Carpogonium, c., and hypogynous cells, h. c., 
fusing, t. trichogyne cut off. x 1000. 
Fig. 6. Part of a procarpium just after fertilisation. In the carpogonium, c., are 
two nuclei. Other letters as before. x 1000. 
Fig. 7. Longitudinal median section of a procarpium-branch. c. s. joint-cell of 
central axis, p' p u p'" three procarpia ; cfg. c. the carpogenous cells. In p' the 
cells of the carpogenous branch and a little of the trichogyne were visible under a 
^-inch obj. In p'" the greater part of the trichogyne was observable, the cells of 
the carpogenous branch were found in another section, c. c. the fused central cell 
of the fruit, showing radiating ooblastema-threads. pp. pericarp or involucre 
(fruit- sheath), x 120. 
Fig. 8. Part of a procarpium (p\ of Fig. 7), showing some of its carpogenous 
cells, cpg. c. Other letters as before, x 400. 
