272 
The nodes (genicula) consist of a single layer of very long cylindrical cells 
with attenuated ends continuing into the joints connected by the node. The state- 
ment of Sorms (l. c. p. 28) that these cells are later on divided by a number of 
thin transversal walls has not been confirmed by YENDO (Genicula, 1904, p. 30), 
neither have I found these walls. The longitudinal walls of the genicular cells are 
not incrustated with calcium carbonate, while the attenuated ends (their extrageni- 
cular portions, YENDO) are incrustated as the cells of the 
joints between which they are inserted. For further in- 
formation on the chemical qualities of the walls of the 
genicular cells comp. YENDO (I. c.). The node is more 
or less covered by a cortex which is interrupted in the 
middle (comp. Kürzıng, Phyc. gen. pl. 79, I). 
Hyaline hairs were not observed in the Danish 
specimens of this species, but as they have been figured 
by THURET in C. mediterranea (Et. phyc. pl. 49 fig. 2 and 4) 
they will probably also be found in the typical C. officinalis. 
The three kinds of conceptacula occur, as far as 
known, always on different individuals (comp. THURET, 
1. c. p. 93). They are either terminal in the ends of shorter 
and longer branches, or lateral, sessile on the joints, and 
the three kinds of conceptacula may all be apical or 
lateral as well (comp. Sos, |. c. p. 5). The lateral con- 
ceptacula are frequently placed on the edges of the joints, 
but their position may also be more irregular on various 
sides of the branches. In a male specimen which was 
very densely beset with conceptacles, many of them were 
fused together. Two or three of them were frequently 
i placed at the same level, forming an incomplete ring at 
Fig. 196. the upper end of the joint, with the ostioles more or less 
Corallina officinalis. Partoffrond drawn out in a horizontal slit (fig. 196). 
with fused male conceptacles. 18:1. 
As to the structure and development of the concep- 
tacles, reference may be made to the repeatedly quoted papers of THURET and SoLMs” 
on Corallina mediterranea, which must be supposed to agree with the typical C. offi- 
cinalis in this respect. 
As shown by THURET (I. c. p. 93, pl. 49 fig. 6), the antheridial conceptacles differ 
from the others in having a conical prolongation containing the ostiole. 1 found 
the same in the Danish specimens. The development and structure of the spermatia 
have been studied by THuRET (I. c. p. 95, pl. 49 fig. 7—9), Soins (1. c. p. 36, Taf. II 
fig. 21--23) and GUIGNARD (|. c.). 
The development of the cystocarp has been thorough described by SorLms and 
I must content myself with referring to his paper, remarking however, that the 
subject needs further examination after the important paper by MINDER on Choreo- 
