m _ 
In more developed plantlets several multicellular rhizoids are developed from the 
corticating bands near the base of the plant, giving rise to adhesive discs (holdfasts) 
at their tip. In fig, 308 is represented a long rhizoid showing 
narrow cortical bands at the nodes like the upright fronds. 
The hyaline hairs have been mentioned by Henn. PE- 
TERSEN (1908) and by me (1911). They have been met with 
in almost all the species and may perhaps occur in all of 
them. However, in one species they have not been observed, 
namely in C. cimbricum, which has only been found in the 
Limfjord in rather deep water of slight transparency. These 
hairs may be very numerous and vigorous (K. R. 1911, fig. 3) 
and remain alive long; in other cases they reach only an 
inconsiderable size and decay early (fig. 314). They appear 
early in the plantlets a few days after the beginning of the germ- 
ination. According to PETERSEN the hairs are wanting in winter. 
Gland cells occur in C. fenuissimum and C. Areschougii, 
as shown by PETER- 
SEN (1908 and 1911). 
The antheridia were 
briefly described and 
pictured by BuFFHAM 
(1884 p. 342 pl. XII 
figs. 2—5, 1888 p. 260, 
Fig. 308. 
Ceramium diaphanum. Base of 
plant with downward grow- pl. XOXG fig. 4), and 
ing branches produeing finally 
terminal hapters. 48 : 1. HENN. PETERSEN de- 
scribed their develop- 
ment (1908 p. 50); they were recorded in 
several Danish species, as a rule in particular 
male plants, in C. fruticulosum in the same 
plants as the carpogonia. 
The development of the cystocarps was 
described by JanczEwskı (1876), PHILLIPS 
(1897) and Kyrın (1923). In the species ex- 
amined by the two first-named authors two 
carpogonial branches were found, one on each 
side of the auxiliary mother-cell, while Kyrın 
found only one in C. rubrum. In C. fruticulosum 
I found two (fig. 309). In the same species 
I found numerous spermatia loosely adhering 
Fig. 309. 
2 el 5 R Ceramium fruticulosum. A, young carpogonial 
to sterile hairs in the neighbourhood of the branches, partly still tricellular. B, carpogonial 
procarps (fig. 309 B). branch with still infertilised trichogyne ; numer- 
ee SELER ous spermatia adhere loosely by a sterile hair. C, 
The division of the tetrasporangia in the fertilised carpogonium. 4, B 625:1. C 390:1. 
