Johnson . — Sphaerococcus coronopifolius , Stackh. 303 
the fruiting thallus (natural size). Harvey 1 describes the 
branches as c multifid ending in acute lacinise [branchlets] 
fringed with cilia [procarpium-branches], tubercles [cystocarps] 
immersed in the cilia.’ The first biologist who gave any details 
of the internal structure of the cystocarp was J. Agardh 2 , and 
in these words : ‘ Coccidia . . . nucleum simplicem foventia ; 
placenta basalis cellulis strati medullaris contexta, a vertice 
et lateribus fila gemmidiifera ima basi subfasciculata.’ Kiit- 
zing 3 in 1 843 was the first and only observer who figured the 
internal structure of the cystocarp. In this figure, repeated 
in Kutzing’s ‘ Tabulae Phycologicae 4 ’ and in Hauck’s 5 ‘Die 
Meeresalgen,’ taken from a transverse section of the fruit, 
the sporigerous filaments are represented radiating from a 
central placenta of numerous small cells. There is no in- 
dication of the very large fused ‘ central cell 5 which I have 
described. It looks very much as if Kutzing’s figure was 
made from a transverse section of the fruit beyond the point 
of origin of the sporigerous filaments from the central cell 
and in the region of the ‘ carpogenous cells.’ The procarpia 
have not hitherto been observed. 
I am very much indebted to Dr. D. H. Scott for the sug- 
gestion of the investigation, for the supply of the material, and 
for opportunities of examining it. 
1 Harvey, op. cit. 
2 J- Agardh, Sp. Alg., iii. p. 395. 
3 Kiitzing, Phyc. Gener., p. 403, Tab. 61. 1 . 
4 Kiitzing, Tab. phyc. xviii. Tab. 10. 
5 Hauck, op. cit., p. 179, Fig. 76 b. 
